WO1992022143A1 - Power control circuitry for achieving wide dynamic range in a transmitter - Google Patents

Power control circuitry for achieving wide dynamic range in a transmitter Download PDF

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Publication number
WO1992022143A1
WO1992022143A1 PCT/US1992/002774 US9202774W WO9222143A1 WO 1992022143 A1 WO1992022143 A1 WO 1992022143A1 US 9202774 W US9202774 W US 9202774W WO 9222143 A1 WO9222143 A1 WO 9222143A1
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WO
WIPO (PCT)
Prior art keywords
signal
power level
control circuitry
output signal
adjusting
Prior art date
Application number
PCT/US1992/002774
Other languages
French (fr)
Inventor
James E. Mitzlaff
Original Assignee
Motorola, Inc.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Motorola, Inc. filed Critical Motorola, Inc.
Priority to GB9322753A priority Critical patent/GB2271231B/en
Priority to DE4291711A priority patent/DE4291711C2/en
Priority to DE4291711T priority patent/DE4291711T1/en
Priority to JP5500389A priority patent/JP2965702B2/en
Priority to BR9206081A priority patent/BR9206081A/en
Publication of WO1992022143A1 publication Critical patent/WO1992022143A1/en

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Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03G—CONTROL OF AMPLIFICATION
    • H03G3/00—Gain control in amplifiers or frequency changers without distortion of the input signal
    • H03G3/20—Automatic control
    • H03G3/30—Automatic control in amplifiers having semiconductor devices
    • H03G3/3036—Automatic control in amplifiers having semiconductor devices in high-frequency amplifiers or in frequency-changers
    • H03G3/3042—Automatic control in amplifiers having semiconductor devices in high-frequency amplifiers or in frequency-changers in modulators, frequency-changers, transmitters or power amplifiers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/02—Transmitters
    • H04B1/04—Circuits
    • H04B2001/0408—Circuits with power amplifiers
    • H04B2001/0416—Circuits with power amplifiers having gain or transmission power control

Definitions

  • the present invention is generally related to transmitters in radiotelephones, and more specifically, related to power control circuitry that may be advantageously used in transmitters for radiotelephones.
  • PCN personal communication networks
  • CDMA code division multiple access
  • Control circuitry adjusts the level of an output signal.
  • the control circuitry adjusts a priori the level of a signal having a first frequency to produce an adjusted signal having a first frequency, translates the adjusted signal having a first frequency to a translated signal having a second frequency, and adjusts a priori the level of the translated signal having a second frequency to produce the adjusted output signal having a second frequency.
  • FIG. 1 is a block diagram generally illustrating a RF signal power amplifier employing power control circuitry in accordance with the invention.
  • FIG. 2 is a block diagram of the power control circuitry in accordance with the invention.
  • FIG. 3 is a flow chart for the process used by amplifier control circuitry 236 to set RF attenuator 221 in
  • FIG. 4 is a flow chart for the process used by amplifier control circuitry 236 to set IF attenuator 200 in FIG. 2.
  • FIG. 1 illustrates a RF signal power amplifier which may advantageously employ the present invention.
  • a RF signal power amplifier is typically part of a radio transmitter, such as that described in Motorola Instruction Manual No. 68P81039E25, entitled, “Advanced Mobile Phone System", and published by Motorola Service Publications, 1301 E. Algonquin Rd., Schaumburg, IL. 1979.
  • the RF signal power amplifier in FIG. 1 includes power control circuitry 100 which accepts a modulated IF signal 101, upcon verts the IF signal 101 to a RF output signal 103 and adjusts the IF signal 101 and the RF output signal 103 proportional to a magnitude control signal, MAG_CNTRL 102.
  • MAG.CNTRL 102 is an MAG.CNTRL 102
  • 8 -bit digital word used to represent the desired RF output signal at a particular power level.
  • the number of bits in the digital word may vary depending on the number of transmission levels the system requires.
  • the 100 is RF output signal 103 having a desired power level related to the magnitude control signal.
  • the RF output signal is coupled via a filter 109 to an antenna 112.
  • the output power level developed by the power control circuitry 100 typically amplifies the input signal 101 from approximately one milliwatt to 5 or more watts.
  • FIG. 2 depicts further detail of the power control circuitry 100 in accordance with the invention.
  • FIG. 2 consists of an IF attenuator 200, a mixer 212, a filter and buffer amplifier 218, a RF attenuator 221, power amplifiers (PA's) 227, a power detector 230 and amplifier control circuitry 236.
  • a modulated IF signal 101 enters IF attenuator 200 and is attenuated by an amount dependent on the value of a first adjustment control signal, IF_CNTRL 239.
  • IF attenuator 200 is a balanced mixer type attenuator PAS-3 manufactured by Mini-Circuits and is used to adjust the level of the IF signal 101.
  • IF attenuator may be realized by employing PIN diode attenuators or gain controllable amplifiers, such as a Hewlett-Packard HPVA- 0180 gain controllable amplifier.
  • Output from IF attenuator 200 is an adjusted IF signal 203 which then enters a mixer 212.
  • the mixer 212 can be any conventional mixer circuit, such as a double balanced, diode type mixer or balanced Gilbert Cell type active mixer to minimize local oscillator (LO) feedthrough and is used to translate the adjusted IF signal 203 to a RF signal 215.
  • the mixer 212 also has as an input a reference signal 209 which is generated by the LO reference 206.
  • Output from the mixer 212 is a RF signal 215 which is then filtered and buffered by filter and buffer amplifier 218.
  • the filter and buffer amplifier 218 are required to remove spurious components from the mixer output and build up the signal to the levels needed to drive subsequent stages.
  • the RF signal 215 enters a second attenuator, RF attenuator 221.
  • RF attenuator 221 is a balanced mixer type attenuator PAS-2 manufactured by Mini-Circuits and is used to adjust the level of the RF signal 215.
  • the RF signal 215 is attenuated by an amount depending on the value of a second attenuation control signal, RF_CNTRL 242.
  • Output from the RF attenuators 221 is an adjusted RF signal 224 which is amplified by power amplifiers 227 to produce the desired RF output signal.
  • the power amplifiers 227 may be any conventional class A, AB, or B power amplifiers which may be driven into saturation for higher efficiency when constant envelope modulation schemes (such as FM) are employed.
  • a power detector 230 detects the magnitude of the desired RF output signal and produces a magnitude detection signal, MAG_DET 233.
  • the power detector may be any conventional power detector such as diode type detectors or logarithmic amplifier/detector circuitry.
  • Amplifier control circuitry 236 accepts MAG_DET 233, and also MAG.CNTRL 102. Amplifier control circuitry 236 determines IF_CNTRL 239 and RF_CNTRL 242 relative to the difference between MAG_DET 233 and MAG_CNTRL
  • Amplifier control circuitry 236 is at the heart of the power control circuitry 100 and is unique in that it must control two outputs instead of just one.
  • a microprocessor such as a Motorola 68HC11, could be used to digitally control IF attenuator 200 and RF attenuator 221.
  • Digital-to-analog (D/A) converters can be used on each output as required to provide IF_CNTRL 239 and RF_CNTRL 242 in analog form. As digitally controlled attenuators become more commonplace, the D/A converters will not be required.
  • an A/D converter can be used to digitize the output of the power detector 230.
  • MAG_DET 233 would be a digital representation of the desired RF output signal.
  • Control of IF attenuator 200 and RF attenuator 221 is accomplished as follows.
  • Amplifier control circuitry 236 would allow the desired RF output signal 103 to be within a predetermined power level range or dynamic range, which for purposes of example, might be 80 dB.
  • An adjustment power level range which is less than the 80 dB dynamic range, is programmed into the microprocessor of amplifier control circuitry 236. This range, again for example purposes, may be anywhere between 0 and 40 dB below the maximum available power level. If the desired RF output signal is to be within this smaller range, only RF attenuator 221 is adjusted.
  • FIG. 3 depicts the steps amplifier control circuitry 236 undergoes to set RF attenuator 221 during this process. The process starts at 300 when amplifier control circuitry 236 reads at 303 MAG_DET 233. A test is then performed to determine if MAG_DET 233 is equivalent to MAG_CNTRL 102. If it is, amplifier control circuitry 236 will again read at 303 MAG_DET 233.
  • MAG_DET 233 is not equivalent to MAG_CNTRL 102, another test is performed at 309 to determine if MAG_DET 233 is greater than MAG_CNTRL 102. If it is, the desired RF output signal 103 is too high and must be attenuated. This is accomplished by amplifier control circuitry 236 by increasing at 312 the amount of attenuation of RF attenuator 221. After the attenuation is increased, amplifier control circuitry 236 will again read at 303 MAG_DET 233.
  • MAG_DET 233 is not greater than MAG_CNTRL 102, the desired RF output signal 103 is below the level required by MAG_CNTRL 102, and consequently amplifier control circuitry 236 decreases at 315 the attenuation of RF attenuator 221. Again, after the attenuation has been decreased, amplifier control circuitry 236 reads at 303 MAG_DET 233 to determine if the level is as desired.
  • RF attenuator 221 is the only attenuator which is adjusted. This is important for subscriber units which run off of battery power, since less current is used in switching only one of the two available attenuators. Another important reason for controlling RF attenuator 221 at the higher power levels is to minimize power consumed by the PA's 227, which is often directly proportional to PA input/output power. In addition, the current supplied to PA's 227 when higher power levels are required is varied as a function of the required output level.
  • bias control signal 225 from amplifier control circuitry 236 to the PA's 227 is varied to control PA idle current for Class A and AB PA's.
  • Amplifier control circuitry 236 monitors MAG_CNTRL 102, and when MAG_CNTRL 102 is within the aforementioned adjustment power level range, amplifier control circuitry 236 will set the bias control signal 225 to a predetermined level so as to limit PA current to the minimum level needed to produce the required output power.
  • amplifier control circuitry 236 will reduce the current supplied to the PA's 227 to a minimum current required to maintain transmission at the required output power level.
  • the major drawback of single attenuator transmitter paths is that the attenuation is limited to around 40 dB of control range due to stray coupling around the attenuator itself. That is, even though the path through the attenuator can be cutoff completely, some amount of signal always leaks around the attenuator and into succeeding amplifier stages.
  • a similar feedback loop as that described in FIG. 3 for adjusting IF attenuator 200 through IF_CNTRL 239 could be used for ranges between 40 to 80 dB below the maximum power level.
  • an incremental control scheme using a linear IF attenuator 200 may be incorporated.
  • the attenuation is "calibrated" so that a given step in IF_CNTRL 239 say 1 V, produces a constant change in power, like 10 dB.
  • FIG. 4 depicts the steps amplifier control circuitry 236 would undergo to perform the incremental control scheme.
  • the process starts at 400 when amplifier control circuitry 236 reads at 403 MAG_CNTRL 102.
  • a test is then performed at 406 to determine if the newly read MAG_CNTRL 102 is equal to the last magnitude control signal. If it is, IF attenuator 200 does not need to be adjusted and amplifier control circuitry 236 will read at 403 the next MAG_CNTRL 102. If, however, the newly read MAG.CNTRL 102 is not equal to the last MAG.CNTRL 102, amplifier control circuitry 236 will determine at 409 the difference between the new and the old MAG_CNTRL's.
  • Amplifier control circuitry 236 determines at 412 the appropriate IF_CNTRL 239 to be applied to IF attenuator 200.
  • IF attenuator 200 then has its attenuation incremented/decremented at 415 as required.
  • a new MAG.CNTRL 102 is read at 403 by amplifier control circuitry 236 and the process is repeated.
  • the use of an attenuator in the IF branch and an attenuator in the RF branch reduces the affects of stray coupling around the attenuators to effectively increase the dynamic range of the transmitter.
  • This two stage control scheme also provides for improved efficiency by enabling the PA's 227 current to be cut back as the RF output power level is reduced.

Abstract

Power control circuitry (100) uses two attenuators in the transmit path to achieve wide dynamic range. An intermediate frequency (IF) attenuator (200) is placed before a mixer (212) in the IF section of the transmit path and a radio frequency (RF) attenuator (221) is placed after the mixer (212) in the RF section of the transmit path. Power control circuitry (236) controls setting of the two attenuators in response to a magnitude control signal (102) related to an RF output signal at a desired power level. To conserve battery power of the subscriber unit, only the RF attenuator (221) is adjusted when the desired power level is to be within a given range below the maximum transmission level. For ranges below the given range, the RF attenuator (221) is set for maximum attenuation and the IF attenuator (200) is adjusted.

Description

POWER CONTROL CIRCUITRY FOR ACHIEVING WIDE DYNAMIC RANGE IN A TRANSMITTER
Field of the Invention
The present invention is generally related to transmitters in radiotelephones, and more specifically, related to power control circuitry that may be advantageously used in transmitters for radiotelephones.
Background of the Invention
Cellular telephones currently continuously transmit during a telephone call. In a typical scenario, a subscriber unit moves throughout a cell while constantly maintaining communication with a base station located approximately in the center of the cell. As the subscriber unit moves throughout the cell, the received signal strength indication (RSSI) as seen by the base station, varies significantly. This variance has the potential to overload the receiver in the base station when the subscriber unit is very close to the base station.
As personal communication networks (PCN) and code division multiple access (CDMA) type cellular systems evolve, the dynamic range requirements on transmitters becomes more stringent. To avoid overloading of the base station receiver when a subscriber unit is very close to the base station, the subscriber unit must have a typical dynamic range upwards to approximately 80 dB. All current approaches to PA power control, however, are limited to around 40 dB dynamic range because stray RF coupling limits the amount of attenuation that can be achieved to about that level. Stray radiation also becomes a problem when attenuation levels between 40-80 dB are attempted.
Thus, a need exists for power control circuitry which achieves a wide dynamic range while overcoming the problems of stray RF coupling and stray radiation.
Summary of the Invention
Control circuitry adjusts the level of an output signal. The control circuitry adjusts a priori the level of a signal having a first frequency to produce an adjusted signal having a first frequency, translates the adjusted signal having a first frequency to a translated signal having a second frequency, and adjusts a priori the level of the translated signal having a second frequency to produce the adjusted output signal having a second frequency.
Brief Description of the Drawings
FIG. 1 is a block diagram generally illustrating a RF signal power amplifier employing power control circuitry in accordance with the invention.
FIG. 2 is a block diagram of the power control circuitry in accordance with the invention. FIG. 3 is a flow chart for the process used by amplifier control circuitry 236 to set RF attenuator 221 in
FIG. 2. FIG. 4 is a flow chart for the process used by amplifier control circuitry 236 to set IF attenuator 200 in FIG. 2.
Detailed Description of a Preferred Embodiment
FIG. 1 illustrates a RF signal power amplifier which may advantageously employ the present invention. A RF signal power amplifier is typically part of a radio transmitter, such as that described in Motorola Instruction Manual No. 68P81039E25, entitled, "Advanced Mobile Phone System", and published by Motorola Service Publications, 1301 E. Algonquin Rd., Schaumburg, IL. 1979. The RF signal power amplifier in FIG. 1 includes power control circuitry 100 which accepts a modulated IF signal 101, upcon verts the IF signal 101 to a RF output signal 103 and adjusts the IF signal 101 and the RF output signal 103 proportional to a magnitude control signal, MAG_CNTRL 102. In the preferred embodiment, MAG.CNTRL 102 is an
8 -bit digital word used to represent the desired RF output signal at a particular power level. In alternate embodiments, the number of bits in the digital word may vary depending on the number of transmission levels the system requires. Output from the power control circuitry
100 is RF output signal 103 having a desired power level related to the magnitude control signal. The RF output signal is coupled via a filter 109 to an antenna 112. The output power level developed by the power control circuitry 100 typically amplifies the input signal 101 from approximately one milliwatt to 5 or more watts.
FIG. 2 depicts further detail of the power control circuitry 100 in accordance with the invention. FIG. 2 consists of an IF attenuator 200, a mixer 212, a filter and buffer amplifier 218, a RF attenuator 221, power amplifiers (PA's) 227, a power detector 230 and amplifier control circuitry 236. A modulated IF signal 101 enters IF attenuator 200 and is attenuated by an amount dependent on the value of a first adjustment control signal, IF_CNTRL 239. In the preferred embodiment, IF attenuator 200 is a balanced mixer type attenuator PAS-3 manufactured by Mini-Circuits and is used to adjust the level of the IF signal 101. In alternate embodiments, IF attenuator may be realized by employing PIN diode attenuators or gain controllable amplifiers, such as a Hewlett-Packard HPVA- 0180 gain controllable amplifier. Output from IF attenuator 200 is an adjusted IF signal 203 which then enters a mixer 212. The mixer 212 can be any conventional mixer circuit, such as a double balanced, diode type mixer or balanced Gilbert Cell type active mixer to minimize local oscillator (LO) feedthrough and is used to translate the adjusted IF signal 203 to a RF signal 215. The mixer 212 also has as an input a reference signal 209 which is generated by the LO reference 206. Output from the mixer 212 is a RF signal 215 which is then filtered and buffered by filter and buffer amplifier 218. The filter and buffer amplifier 218 are required to remove spurious components from the mixer output and build up the signal to the levels needed to drive subsequent stages. Continuing, the RF signal 215 enters a second attenuator, RF attenuator 221. In the preferred embodiment, RF attenuator 221 is a balanced mixer type attenuator PAS-2 manufactured by Mini-Circuits and is used to adjust the level of the RF signal 215. The RF signal 215 is attenuated by an amount depending on the value of a second attenuation control signal, RF_CNTRL 242. Output from the RF attenuators 221 is an adjusted RF signal 224 which is amplified by power amplifiers 227 to produce the desired RF output signal. The power amplifiers 227 may be any conventional class A, AB, or B power amplifiers which may be driven into saturation for higher efficiency when constant envelope modulation schemes (such as FM) are employed. A power detector 230 detects the magnitude of the desired RF output signal and produces a magnitude detection signal, MAG_DET 233. The power detector may be any conventional power detector such as diode type detectors or logarithmic amplifier/detector circuitry. Amplifier control circuitry 236 accepts MAG_DET 233, and also MAG.CNTRL 102. Amplifier control circuitry 236 determines IF_CNTRL 239 and RF_CNTRL 242 relative to the difference between MAG_DET 233 and MAG_CNTRL
102.
Amplifier control circuitry 236 is at the heart of the power control circuitry 100 and is unique in that it must control two outputs instead of just one. In the preferred embodiment, a microprocessor, such as a Motorola 68HC11, could be used to digitally control IF attenuator 200 and RF attenuator 221. Digital-to-analog (D/A) converters can be used on each output as required to provide IF_CNTRL 239 and RF_CNTRL 242 in analog form. As digitally controlled attenuators become more commonplace, the D/A converters will not be required. Likewise, in an alternate embodiment, an A/D converter can be used to digitize the output of the power detector 230. In this embodiment MAG_DET 233 would be a digital representation of the desired RF output signal.
Control of IF attenuator 200 and RF attenuator 221 is accomplished as follows. Amplifier control circuitry 236 would allow the desired RF output signal 103 to be within a predetermined power level range or dynamic range, which for purposes of example, might be 80 dB. An adjustment power level range, which is less than the 80 dB dynamic range, is programmed into the microprocessor of amplifier control circuitry 236. This range, again for example purposes, may be anywhere between 0 and 40 dB below the maximum available power level. If the desired RF output signal is to be within this smaller range, only RF attenuator 221 is adjusted. If MAG_CNTRL 102 entering amplifier control circuitry 236 indicates that the subscriber unit must transmit within this 0 to 40 dB range below the maximum, IF attenuator 200 is set for maximum output and a control loop is invoked. FIG. 3 depicts the steps amplifier control circuitry 236 undergoes to set RF attenuator 221 during this process. The process starts at 300 when amplifier control circuitry 236 reads at 303 MAG_DET 233. A test is then performed to determine if MAG_DET 233 is equivalent to MAG_CNTRL 102. If it is, amplifier control circuitry 236 will again read at 303 MAG_DET 233. If MAG_DET 233 is not equivalent to MAG_CNTRL 102, another test is performed at 309 to determine if MAG_DET 233 is greater than MAG_CNTRL 102. If it is, the desired RF output signal 103 is too high and must be attenuated. This is accomplished by amplifier control circuitry 236 by increasing at 312 the amount of attenuation of RF attenuator 221. After the attenuation is increased, amplifier control circuitry 236 will again read at 303 MAG_DET 233. If MAG_DET 233 is not greater than MAG_CNTRL 102, the desired RF output signal 103 is below the level required by MAG_CNTRL 102, and consequently amplifier control circuitry 236 decreases at 315 the attenuation of RF attenuator 221. Again, after the attenuation has been decreased, amplifier control circuitry 236 reads at 303 MAG_DET 233 to determine if the level is as desired.
As long as MAG_CNTRL 102 requests the subscriber to transmit within 40 dB of the maximum (the adjustment power level range), RF attenuator 221 is the only attenuator which is adjusted. This is important for subscriber units which run off of battery power, since less current is used in switching only one of the two available attenuators. Another important reason for controlling RF attenuator 221 at the higher power levels is to minimize power consumed by the PA's 227, which is often directly proportional to PA input/output power. In addition, the current supplied to PA's 227 when higher power levels are required is varied as a function of the required output level. To optimize PA efficiency throughout the adjustment power level range, bias control signal 225 from amplifier control circuitry 236 to the PA's 227 is varied to control PA idle current for Class A and AB PA's. Amplifier control circuitry 236 monitors MAG_CNTRL 102, and when MAG_CNTRL 102 is within the aforementioned adjustment power level range, amplifier control circuitry 236 will set the bias control signal 225 to a predetermined level so as to limit PA current to the minimum level needed to produce the required output power. When the transmission level is required to be the below the adjustment power level range, amplifier control circuitry 236 will reduce the current supplied to the PA's 227 to a minimum current required to maintain transmission at the required output power level. This output power level, and its corresponding minimum current level, occurs at the bottom of the adjustment power level range. Also at this time, RF attenuator 221 is set to maximum attenuation and IF attenuator 200 is then adjusted to provide for further reductions in RF output power. Use of two attenuators in the transmit path, where the signals attenuated are at different frequencies, allows for the wide dynamic range of the transmitter. The major drawback of single attenuator transmitter paths is that the attenuation is limited to around 40 dB of control range due to stray coupling around the attenuator itself. That is, even though the path through the attenuator can be cutoff completely, some amount of signal always leaks around the attenuator and into succeeding amplifier stages. Two attenuators in the transmit path, where the signals are at different frequencies, avoid the stray coupling problem since the IF signal will not propagate through the RF circuitry, even if there is some IF signal leakage. Attenuating at both IF and RF also minimizes stray radiation, since the level of transmit frequency signal present inside the subscriber unit is greatly reduced.
If the power detector 230 has approximately 80 dB of dynamic range, then a similar feedback loop as that described in FIG. 3 for adjusting IF attenuator 200 through IF_CNTRL 239, could be used for ranges between 40 to 80 dB below the maximum power level. In the preferred embodiment, since detector range is usually limited to below 80 dB, an incremental control scheme using a linear IF attenuator 200 may be incorporated. In the linear IF attenuator 200, the attenuation is "calibrated" so that a given step in IF_CNTRL 239 say 1 V, produces a constant change in power, like 10 dB.
FIG. 4 depicts the steps amplifier control circuitry 236 would undergo to perform the incremental control scheme. The process starts at 400 when amplifier control circuitry 236 reads at 403 MAG_CNTRL 102. A test is then performed at 406 to determine if the newly read MAG_CNTRL 102 is equal to the last magnitude control signal. If it is, IF attenuator 200 does not need to be adjusted and amplifier control circuitry 236 will read at 403 the next MAG_CNTRL 102. If, however, the newly read MAG.CNTRL 102 is not equal to the last MAG.CNTRL 102, amplifier control circuitry 236 will determine at 409 the difference between the new and the old MAG_CNTRL's. Amplifier control circuitry 236 then determines at 412 the appropriate IF_CNTRL 239 to be applied to IF attenuator 200. IF attenuator 200 then has its attenuation incremented/decremented at 415 as required. After the attenuation has been incremented/decremented, a new MAG.CNTRL 102 is read at 403 by amplifier control circuitry 236 and the process is repeated. Thus, needs have been substantially met for power control circuitry which provides wide dynamic range for use in radiotelephone systems where overloading of a base-station receiver must be avoided. The use of an attenuator in the IF branch and an attenuator in the RF branch reduces the affects of stray coupling around the attenuators to effectively increase the dynamic range of the transmitter. This two stage control scheme also provides for improved efficiency by enabling the PA's 227 current to be cut back as the RF output power level is reduced.
What I claim is:

Claims

Claims
1. Control circuitry for adjusting the level of an output signal comprising:
first means for adjusting a priori the level of a signal having a first frequency to produce an adjusted signal having a first frequency; means, coupled to said first means for adjusting, for translating said adjusted signal having a first frequency to a translated signal having a second frequency; and second means, coupled to said means for translating, for adjusting a priori the level of said translated signal having a second frequency to produce the adjusted output signal having a second frequency.
2. The control circuitry of claim 1 wherein said first means for adjusting further comprises one of either attenuating the level of said signal having a first frequency or variably amplifying the level of said signal having a first frequency.
3. The control circuitry of claim 1 wherein said second means for adjusting further comprises one of either attenuating the level of said translated signal having a second frequency or variably amplifying the level of said translated signal having a second frequency.
4. Power control circuitry for adjusting the power level of a radio frequency (RF) output signal, the power control circuitry having as input an intermediate frequency (IF) signal from a signal source, the power control circuitry comprising:
first means for adjusting a priori the power level of the IF signal to produce an adjusted IF signal; means, coupled to said first means for adjusting, for translating said adjusted IF signal to the RF output signal; and second means, coupled to said means for translating, for adjusting a priori the power level of said RF output signal to produce an adjusted RF output signal.
5. The power control circuitry of claim 4 wherein said means for translating further comprises:
means for generating a reference signal; and means for mixing said adjusted IF signal with said generated reference signal to produce said RF output signal.
6. Power control circuitry for adjusting the power level of a radio frequency (RF) output signal over a predetermined power level range in a transmitter, the power control circuitry having as input an intermediate frequency (IF) signal from a signal source, the power control circuitry having the capability to adjust the RF output signal to a desired level and provide at least one adjustment control signal related to the RF output signal at a desired power level, the power control circuitry comprising:
means for providing an adjustment power level range less than or equal to the predetermined power level range; means for generating a reference signal; first means, responsive to a first adjustment control signal, for adjusting the IF signal when the desired power level of the RF output signal is not within said adjustment power level range; means, coupled to said first means for adjusting, for mixing said generated reference signal with said adjusted IF signal to produce the RF output signal; and second means, responsive to a second adjustment control signal, for adjusting said RF output signal when said desired power level of said RF output signal is within said adjustment power level range to produce the RF output signal at the desired power level.
7. The power control circuitry of claim 6 wherein said first means for adjusting further comprises one of either attenuating the power level of said IF signal when the desired power level of the RF output signal is not within said adjustment power level range or variably amplifying the power level of said IF signal when the desired power level of the RF output signal is not within said adjustment power level range.
8. The power control circuitry of claim 6 wherein said second means for adjusting further comprises one of either attenuating the power level of said RF output signal when said desired power level of said RF output signal is within said adjustment power level range or attenuating said RF signal by the maximum attenuation when said desired power level of said RF output signal is not within said adjustment power level range.
9. A method of adjusting the level of an output signal comprising the steps of:
adjusting a priori the level of a signal having a first frequency to produce an adjusted signal having a first frequency; translating said adjusted signal having a first frequency to a translated signal having a second frequency; and adjusting a priori the level of said translated signal having a second frequency to produce the adjusted output signal having a second frequency.
10. A method of adjusting the power level of a radio frequency (RF) output signal, the method comprising the steps of:
adjusting a priori the power level of an IF signal to produce an adjusted IF signal; translating said adjusted IF signal to a RF output signal; and adjusting a priori the power level of said RF output signal to produce an adjusted RF output signal.
PCT/US1992/002774 1991-06-03 1992-04-08 Power control circuitry for achieving wide dynamic range in a transmitter WO1992022143A1 (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
GB9322753A GB2271231B (en) 1991-06-03 1992-04-08 Power control curcuitry for achieving wide dynamic range in a transmitter
DE4291711A DE4291711C2 (en) 1991-06-03 1992-04-08 Power control circuit and method for adjusting the power level of a radio frequency signal
DE4291711T DE4291711T1 (en) 1991-06-03 1992-04-08 Power control circuit to achieve a wide dynamic range in a transformer
JP5500389A JP2965702B2 (en) 1991-06-03 1992-04-08 Power control circuit to achieve wide dynamic range in transmitter
BR9206081A BR9206081A (en) 1991-06-03 1992-04-08 Control circuitry, power control circuitry, processes of adjusting output signal level and radio frequency (RF) output signal power level

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US07/709,459 US5307512A (en) 1991-06-03 1991-06-03 Power control circuitry for achieving wide dynamic range in a transmitter
US709,459 1991-06-03

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WO1992022143A1 true WO1992022143A1 (en) 1992-12-10

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US (1) US5307512A (en)
JP (1) JP2965702B2 (en)
BR (1) BR9206081A (en)
CA (1) CA2109810C (en)
DE (2) DE4291711T1 (en)
GB (1) GB2271231B (en)
HK (1) HK1000869A1 (en)
WO (1) WO1992022143A1 (en)

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0645899A2 (en) * 1993-09-24 1995-03-29 Hitachi, Ltd. Mobile communication apparatus with linear power control over wide dynamic range
EP0717492A1 (en) * 1994-12-15 1996-06-19 AT&T Corp. RF power amplifier with increased efficiency at low power
EP0725998A1 (en) * 1994-08-26 1996-08-14 Motorola, Inc. Apparatus and method for shaping and power controlling a signal in a transmitter
GB2307807A (en) * 1995-12-01 1997-06-04 Nokia Telecommunications Oy Detecting and controlling radio frequency power using feedback to attenuator and amplifier
FR2746983A1 (en) * 1996-03-29 1997-10-03 Alps Electric Co Ltd AMPLIFIER CIRCUIT FOR TRANSMITTER
GB2313723A (en) * 1996-05-31 1997-12-03 Samsung Electronics Co Ltd Controlling the output power of a mobile phone using a look-up table for attenuation values and frequencies
GB2317283A (en) * 1996-09-13 1998-03-18 Motorola Inc Transmitter with power control in both if and rf sections
GB2347288A (en) * 1998-12-25 2000-08-30 Matsushita Electric Ind Co Ltd Large dynamic range transmitter power control for a CDMA mobile phone
EP2020760A3 (en) * 2007-07-31 2009-08-05 Broadcom Corporation Method and system for polar modulation with discontinuous phase for RF transmitters with power control
CN117008071A (en) * 2023-10-07 2023-11-07 广东大湾区空天信息研究院 Linear frequency modulation MIMO radar channel calibration method and related equipment

Families Citing this family (90)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH06334541A (en) * 1993-05-25 1994-12-02 Sony Corp Radio transmitter
FR2707061B1 (en) * 1993-06-22 1995-09-15 Alcatel Mobile Comm France
US5452473A (en) * 1994-02-28 1995-09-19 Qualcomm Incorporated Reverse link, transmit power correction and limitation in a radiotelephone system
US5530923A (en) * 1994-03-30 1996-06-25 Nokia Mobile Phones Ltd. Dual mode transmission system with switched linear amplifier
US5564092A (en) * 1994-11-04 1996-10-08 Motorola, Inc. Differential feed-forward amplifier power control for a radio receiver system
US5918166A (en) * 1994-11-30 1999-06-29 Nec Corportion Level control circuit for portable radio communication apparatus
JPH08228116A (en) * 1994-11-30 1996-09-03 Nec Corp Level control circuit
US5852770A (en) * 1995-09-19 1998-12-22 Sanyo Electric Co., Ltd. Transmission power control device for a portable terminal
US5623227A (en) * 1995-10-17 1997-04-22 Motorola, Inc. Amplifier circuit and method of controlling an amplifier for use in a radio frequency communication system
US5621354A (en) * 1995-10-17 1997-04-15 Motorola, Inc. Apparatus and method for performing error corrected amplification in a radio frequency system
JP2996170B2 (en) * 1996-03-21 1999-12-27 日本電気株式会社 Gain control circuit
SE506842C2 (en) * 1996-06-28 1998-02-16 Ericsson Telefon Ab L M Device and method of radio transmitters for control of power amplifiers
US5752172A (en) * 1996-08-16 1998-05-12 Nokia Mobile Phones Limited Distributed transmitter output power control circuit and method for a radio telephone
KR100193842B1 (en) * 1996-09-13 1999-06-15 윤종용 Power Control Circuit and Method of Wireless Communication System
JPH1155131A (en) * 1997-08-06 1999-02-26 Nec Corp Radio transmission power controller
US6122497A (en) * 1997-08-21 2000-09-19 Analog Devices, Inc. RF mixer with inductive degeneration
DE19747275A1 (en) * 1997-10-25 1999-04-29 Philips Patentverwaltung Mobile radio device with a control signal generator
JP3607097B2 (en) 1998-10-29 2005-01-05 アルプス電気株式会社 Transmitter circuit
US6341219B1 (en) * 1999-02-05 2002-01-22 Agere Systems Guardian Corp. Single-source automatic power control method and apparatus for frequency-diverse variable-gain stages of a CDMA cellular handset
JP3413132B2 (en) * 1999-02-22 2003-06-03 株式会社東芝 Automatic gain control device
JP2000312154A (en) * 1999-04-27 2000-11-07 Matsushita Electric Ind Co Ltd Power controller and method therefor
US6296565B1 (en) * 1999-05-04 2001-10-02 Shure Incorporated Method and apparatus for predictably switching diversity antennas on signal dropout
JP3592980B2 (en) * 1999-06-29 2004-11-24 株式会社東芝 Transmission circuit and wireless transmission device
JP4292655B2 (en) * 1999-11-09 2009-07-08 株式会社デンソー Sampling device
US6668028B1 (en) * 2000-03-29 2003-12-23 Sony Corporation Low-power CDMA receiver
US6625238B2 (en) * 2000-03-29 2003-09-23 Sony Corporation Low power and high linearity receivers with reactively biased front ends
US6782062B1 (en) * 2000-03-29 2004-08-24 Sony Corporation Low power and high linearity receivers with reactively biased front ends
US6430418B1 (en) * 2000-06-19 2002-08-06 Trw Inc. Method and system for controlling uplink power in a satellite communication system using error leveling
JP2002033629A (en) 2000-07-14 2002-01-31 Nec Corp Gain variable amplifier circuit, and terminal provided with the same
US6785830B1 (en) * 2000-07-21 2004-08-31 Sierra Wireless, Inc. PC radio card capable of operating at a nonstandard power output level by limiting the current being drawn from a power amplifier
US6522201B1 (en) * 2000-09-28 2003-02-18 Eic Corporation RF amplifier having switched load impedance for back-off power efficiency
CN1502165A (en) * 2000-11-03 2004-06-02 �����ɷ� Transmitter bias current adjusting based on transmitter gain
TW503345B (en) * 2001-03-26 2002-09-21 Mediatec Inc Power controller
US6404284B1 (en) 2001-04-19 2002-06-11 Anadigics, Inc. Amplifier bias adjustment circuit to maintain high-output third-order intermodulation distortion performance
DE10124179A1 (en) * 2001-05-17 2002-07-25 Infineon Technologies Ag Controller for output power for mobile radio appts. with at least one HF component
JP2002176368A (en) * 2001-07-11 2002-06-21 Nec Corp Transmission power controller capable of controlling optimization of bias current of transmission output amplifier
US7061993B2 (en) * 2001-08-29 2006-06-13 Sony Corporation CDMA receiver architecture for lower bypass switch point
DE10163466A1 (en) * 2001-12-21 2003-07-10 Infineon Technologies Ag Transmission arrangement for continuous data transmission
US6687491B2 (en) * 2002-01-18 2004-02-03 Sony Corporation Direct conversion of low power high linearity receiver
US20040198261A1 (en) * 2002-06-28 2004-10-07 Wei Xiong Method of self-calibration in a wireless transmitter
US6911904B2 (en) * 2002-09-03 2005-06-28 Lear Corporation System and method for adaptive variable magnetic field generator
US7120400B2 (en) * 2002-12-09 2006-10-10 Intel Corporation Method and apparatus to control power of transmitter
DE10260291A1 (en) * 2002-12-20 2004-07-01 Siemens Ag Electronic circuit for information transmission
KR100546325B1 (en) * 2003-05-09 2006-01-26 삼성전자주식회사 Automatic gain controller providing for large signal to noise ratio and low power consumption by fine gain controlling at almost maximum gain region, mobile phone having it and method thereof
US7613433B2 (en) * 2003-12-19 2009-11-03 Vixs Systems, Inc. Reducing local oscillation leakage in a radio frequency transmitter
US7450915B1 (en) * 2003-12-27 2008-11-11 Sequoia Communications Smart transmitter system
WO2010007475A1 (en) 2008-07-17 2010-01-21 Freescale Semiconductor, Inc. System for monitoring and controlling the power of a radio frequency (rf) signal in a short-range rf transmitter
US8854019B1 (en) 2008-09-25 2014-10-07 Rf Micro Devices, Inc. Hybrid DC/DC power converter with charge-pump and buck converter
US9166471B1 (en) 2009-03-13 2015-10-20 Rf Micro Devices, Inc. 3D frequency dithering for DC-to-DC converters used in multi-mode cellular transmitters
US8315576B2 (en) 2009-05-05 2012-11-20 Rf Micro Devices, Inc. Capacitive compensation of cascaded directional couplers
US8548398B2 (en) 2010-02-01 2013-10-01 Rf Micro Devices, Inc. Envelope power supply calibration of a multi-mode radio frequency power amplifier
US8848110B2 (en) * 2010-03-29 2014-09-30 Silicon Laboratories Inc. Mixed-mode receiver circuit including digital gain control
US8538355B2 (en) 2010-04-19 2013-09-17 Rf Micro Devices, Inc. Quadrature power amplifier architecture
US9577590B2 (en) 2010-04-20 2017-02-21 Qorvo Us, Inc. Dual inductive element charge pump buck and buck power supplies
US8831544B2 (en) 2010-04-20 2014-09-09 Rf Micro Devices, Inc. Dynamic device switching (DDS) of an in-phase RF PA stage and a quadrature-phase RF PA stage
US9048787B2 (en) 2010-04-20 2015-06-02 Rf Micro Devices, Inc. Combined RF detector and RF attenuator with concurrent outputs
US9077405B2 (en) 2010-04-20 2015-07-07 Rf Micro Devices, Inc. High efficiency path based power amplifier circuitry
US9030256B2 (en) 2010-04-20 2015-05-12 Rf Micro Devices, Inc. Overlay class F choke
US8942650B2 (en) 2010-04-20 2015-01-27 Rf Micro Devices, Inc. RF PA linearity requirements based converter operating mode selection
US8913967B2 (en) 2010-04-20 2014-12-16 Rf Micro Devices, Inc. Feedback based buck timing of a direct current (DC)-DC converter
US8542061B2 (en) 2010-04-20 2013-09-24 Rf Micro Devices, Inc. Charge pump based power amplifier envelope power supply and bias power supply
US8712349B2 (en) 2010-04-20 2014-04-29 Rf Micro Devices, Inc. Selecting a converter operating mode of a PA envelope power supply
US8842399B2 (en) 2010-04-20 2014-09-23 Rf Micro Devices, Inc. ESD protection of an RF PA semiconductor die using a PA controller semiconductor die
US8811920B2 (en) 2010-04-20 2014-08-19 Rf Micro Devices, Inc. DC-DC converter semiconductor die structure
US9214900B2 (en) 2010-04-20 2015-12-15 Rf Micro Devices, Inc. Interference reduction between RF communications bands
US8947157B2 (en) 2010-04-20 2015-02-03 Rf Micro Devices, Inc. Voltage multiplier charge pump buck
US8989685B2 (en) 2010-04-20 2015-03-24 Rf Micro Devices, Inc. Look-up table based configuration of multi-mode multi-band radio frequency power amplifier circuitry
US8565694B2 (en) 2010-04-20 2013-10-22 Rf Micro Devices, Inc. Split current current digital-to-analog converter (IDAC) for dynamic device switching (DDS) of an RF PA stage
US8706063B2 (en) 2010-04-20 2014-04-22 Rf Micro Devices, Inc. PA envelope power supply undershoot compensation
US8942651B2 (en) 2010-04-20 2015-01-27 Rf Micro Devices, Inc. Cascaded converged power amplifier
US8559898B2 (en) 2010-04-20 2013-10-15 Rf Micro Devices, Inc. Embedded RF PA temperature compensating bias transistor
US8958763B2 (en) 2010-04-20 2015-02-17 Rf Micro Devices, Inc. PA bias power supply undershoot compensation
US9362825B2 (en) 2010-04-20 2016-06-07 Rf Micro Devices, Inc. Look-up table based configuration of a DC-DC converter
US9008597B2 (en) 2010-04-20 2015-04-14 Rf Micro Devices, Inc. Direct current (DC)-DC converter having a multi-stage output filter
US8571492B2 (en) 2010-04-20 2013-10-29 Rf Micro Devices, Inc. DC-DC converter current sensing
US9184701B2 (en) 2010-04-20 2015-11-10 Rf Micro Devices, Inc. Snubber for a direct current (DC)-DC converter
US8983407B2 (en) 2010-04-20 2015-03-17 Rf Micro Devices, Inc. Selectable PA bias temperature compensation circuitry
US8811921B2 (en) 2010-04-20 2014-08-19 Rf Micro Devices, Inc. Independent PA biasing of a driver stage and a final stage
US9214865B2 (en) 2010-04-20 2015-12-15 Rf Micro Devices, Inc. Voltage compatible charge pump buck and buck power supplies
US8913971B2 (en) * 2010-04-20 2014-12-16 Rf Micro Devices, Inc. Selecting PA bias levels of RF PA circuitry during a multislot burst
US8731498B2 (en) 2010-04-20 2014-05-20 Rf Micro Devices, Inc. Temperature correcting an envelope power supply signal for RF PA circuitry
US8983410B2 (en) 2010-04-20 2015-03-17 Rf Micro Devices, Inc. Configurable 2-wire/3-wire serial communications interface
US9900204B2 (en) 2010-04-20 2018-02-20 Qorvo Us, Inc. Multiple functional equivalence digital communications interface
US8892063B2 (en) 2010-04-20 2014-11-18 Rf Micro Devices, Inc. Linear mode and non-linear mode quadrature PA circuitry
US8699973B2 (en) 2010-04-20 2014-04-15 Rf Micro Devices, Inc. PA bias power supply efficiency optimization
US9553550B2 (en) 2010-04-20 2017-01-24 Qorvo Us, Inc. Multiband RF switch ground isolation
DE102010047497A1 (en) 2010-10-06 2012-04-12 Msa Auer Gmbh Arrangement and method for achieving intrinsic safety of a radio transmitter module
US9189005B2 (en) 2010-11-26 2015-11-17 Nec Corporation Transmission power control circuit and transmission device, transmission power control method, program
US9065505B2 (en) 2012-01-31 2015-06-23 Rf Micro Devices, Inc. Optimal switching frequency for envelope tracking power supply
KR102073903B1 (en) 2013-10-31 2020-03-02 삼성전자주식회사 Apparatus and method for controlling signal gain in wireless transmitting device

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4317083A (en) * 1979-03-19 1982-02-23 Rca Corporation Bias adjustment responsive to signal power
US4630117A (en) * 1985-05-30 1986-12-16 General Electric Company Automatic gain control system
EP0388894A1 (en) * 1989-03-20 1990-09-26 Fujitsu Limited A transmission power control system
JPH03280727A (en) * 1990-03-29 1991-12-11 Nippon Telegr & Teleph Corp <Ntt> Transmission power control system

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2146690A1 (en) * 1971-09-17 1973-03-22 Siemens Ag CIRCUIT FOR PRECISE AMPLITUDE SETTING OF A TRANSMITTER
US4004224A (en) * 1972-01-17 1977-01-18 Siemens Aktiengesellschaft Method for fade correction of communication transmission over directional radio paths
US4523155A (en) * 1983-05-04 1985-06-11 Motorola, Inc. Temperature compensated automatic output control circuitry for RF signal power amplifiers with wide dynamic range
JPH0644716B2 (en) * 1984-08-14 1994-06-08 日本電気株式会社 Wireless communication device
US4602218A (en) * 1985-04-30 1986-07-22 Motorola, Inc. Automatic output control circuitry for RF power amplifiers with wide dynamic range
JPH0630031B2 (en) * 1986-09-25 1994-04-20 日本電気株式会社 Automatic power control circuit

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4317083A (en) * 1979-03-19 1982-02-23 Rca Corporation Bias adjustment responsive to signal power
US4630117A (en) * 1985-05-30 1986-12-16 General Electric Company Automatic gain control system
EP0388894A1 (en) * 1989-03-20 1990-09-26 Fujitsu Limited A transmission power control system
JPH03280727A (en) * 1990-03-29 1991-12-11 Nippon Telegr & Teleph Corp <Ntt> Transmission power control system

Cited By (20)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0645899A3 (en) * 1993-09-24 1999-07-14 Hitachi, Ltd. Mobile communication apparatus with linear power control over wide dynamic range
EP0645899A2 (en) * 1993-09-24 1995-03-29 Hitachi, Ltd. Mobile communication apparatus with linear power control over wide dynamic range
EP0725998A1 (en) * 1994-08-26 1996-08-14 Motorola, Inc. Apparatus and method for shaping and power controlling a signal in a transmitter
EP0725998A4 (en) * 1994-08-26 1999-10-20 Motorola Inc Apparatus and method for shaping and power controlling a signal in a transmitter
EP0717492A1 (en) * 1994-12-15 1996-06-19 AT&T Corp. RF power amplifier with increased efficiency at low power
GB2307807A (en) * 1995-12-01 1997-06-04 Nokia Telecommunications Oy Detecting and controlling radio frequency power using feedback to attenuator and amplifier
FR2746983A1 (en) * 1996-03-29 1997-10-03 Alps Electric Co Ltd AMPLIFIER CIRCUIT FOR TRANSMITTER
US6026284A (en) * 1996-05-31 2000-02-15 Samsung Electronics Co., Ltd. Output control unit of mobile communication system and its controlling method
GB2313723B (en) * 1996-05-31 1998-12-30 Samsung Electronics Co Ltd Output control apparatus and method
GB2313723A (en) * 1996-05-31 1997-12-03 Samsung Electronics Co Ltd Controlling the output power of a mobile phone using a look-up table for attenuation values and frequencies
CN1085478C (en) * 1996-05-31 2002-05-22 三星电子株式会社 Output control unit of mobile communication system and its controlling method
GB2317283A (en) * 1996-09-13 1998-03-18 Motorola Inc Transmitter with power control in both if and rf sections
GB2317283B (en) * 1996-09-13 2001-04-25 Motorola Inc Power control circuit for a radio frequency transmitter
GB2347288A (en) * 1998-12-25 2000-08-30 Matsushita Electric Ind Co Ltd Large dynamic range transmitter power control for a CDMA mobile phone
GB2347288B (en) * 1998-12-25 2001-01-10 Matsushita Electric Ind Co Ltd Transmission power control in radio communication
EP2020760A3 (en) * 2007-07-31 2009-08-05 Broadcom Corporation Method and system for polar modulation with discontinuous phase for RF transmitters with power control
US7834687B2 (en) 2007-07-31 2010-11-16 Broadcom Corp. Method and system for polar modulation with discontinuous phase for RF transmitters with power control
CN101360085B (en) * 2007-07-31 2011-08-10 美国博通公司 Method and system for processing communication signal
CN117008071A (en) * 2023-10-07 2023-11-07 广东大湾区空天信息研究院 Linear frequency modulation MIMO radar channel calibration method and related equipment
CN117008071B (en) * 2023-10-07 2023-12-12 广东大湾区空天信息研究院 Linear frequency modulation MIMO radar channel calibration method and related equipment

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US5307512A (en) 1994-04-26
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GB9322753D0 (en) 1994-01-26
CA2109810A1 (en) 1992-12-10

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