CA2298928A1 - Linear power control loop - Google Patents

Linear power control loop Download PDF

Info

Publication number
CA2298928A1
CA2298928A1 CA002298928A CA2298928A CA2298928A1 CA 2298928 A1 CA2298928 A1 CA 2298928A1 CA 002298928 A CA002298928 A CA 002298928A CA 2298928 A CA2298928 A CA 2298928A CA 2298928 A1 CA2298928 A1 CA 2298928A1
Authority
CA
Canada
Prior art keywords
linear
closed loop
loop system
power
control
Prior art date
Legal status (The legal status 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 status listed.)
Granted
Application number
CA002298928A
Other languages
French (fr)
Other versions
CA2298928C (en
Inventor
Normand T. Lemay, Jr.
Brian T. Brunn
John W. Macconnell
Eric Sadowski
Eric W. Lofstad
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Itron Inc
Original Assignee
Itron, Inc.
Normand T. Lemay, Jr.
Brian T. Brunn
John W. Macconnell
Eric Sadowski
Eric W. Lofstad
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 Itron, Inc., Normand T. Lemay, Jr., Brian T. Brunn, John W. Macconnell, Eric Sadowski, Eric W. Lofstad filed Critical Itron, Inc.
Publication of CA2298928A1 publication Critical patent/CA2298928A1/en
Application granted granted Critical
Publication of CA2298928C publication Critical patent/CA2298928C/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R21/00—Arrangements for measuring electric power or power factor
    • G01R21/10—Arrangements for measuring electric power or power factor by using square-law characteristics of circuit elements, e.g. diodes, to measure power absorbed by loads of known impedance
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R21/00—Arrangements for measuring electric power or power factor
    • G01R21/14—Compensating for temperature change
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03B—GENERATION OF OSCILLATIONS, DIRECTLY OR BY FREQUENCY-CHANGING, BY CIRCUITS EMPLOYING ACTIVE ELEMENTS WHICH OPERATE IN A NON-SWITCHING MANNER; GENERATION OF NOISE BY SUCH CIRCUITS
    • H03B5/00—Generation of oscillations using amplifier with regenerative feedback from output to input
    • H03B5/02—Details
    • H03B5/04—Modifications of generator to compensate for variations in physical values, e.g. power supply, load, temperature
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03C—MODULATION
    • H03C1/00—Amplitude modulation
    • H03C1/02—Details
    • H03C1/06—Modifications of modulator to reduce distortion, e.g. by feedback, and clearly applicable to more than one type of modulator
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F1/00—Details of amplifiers with only discharge tubes, only semiconductor devices or only unspecified devices as amplifying elements
    • H03F1/34—Negative-feedback-circuit arrangements with or without positive feedback
    • H03F1/345—Negative-feedback-circuit arrangements with or without positive feedback using hybrid or directional couplers
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
    • H03F3/45—Differential amplifiers
    • H03F3/45071—Differential amplifiers with semiconductor devices only
    • H03F3/45076—Differential amplifiers with semiconductor devices only characterised by the way of implementation of the active amplifying circuit in the differential amplifier
    • H03F3/45475—Differential amplifiers with semiconductor devices only characterised by the way of implementation of the active amplifying circuit in the differential amplifier using IC blocks as the active amplifying circuit
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03G—CONTROL OF AMPLIFICATION
    • H03G3/00—Gain control in amplifiers or frequency changers without distortion of the input signal
    • H03G3/004—Control by varying the supply voltage
    • 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
    • H03—ELECTRONIC CIRCUITRY
    • H03L—AUTOMATIC CONTROL, STARTING, SYNCHRONISATION, OR STABILISATION OF GENERATORS OF ELECTRONIC OSCILLATIONS OR PULSES
    • H03L1/00—Stabilisation of generator output against variations of physical values, e.g. power supply
    • H03L1/02—Stabilisation of generator output against variations of physical values, e.g. power supply against variations of temperature only
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03L—AUTOMATIC CONTROL, STARTING, SYNCHRONISATION, OR STABILISATION OF GENERATORS OF ELECTRONIC OSCILLATIONS OR PULSES
    • H03L7/00—Automatic control of frequency or phase; Synchronisation
    • H03L7/06—Automatic control of frequency or phase; Synchronisation using a reference signal applied to a frequency- or phase-locked loop
    • H03L7/16—Indirect frequency synthesis, i.e. generating a desired one of a number of predetermined frequencies using a frequency- or phase-locked loop
    • H03L7/18—Indirect frequency synthesis, i.e. generating a desired one of a number of predetermined frequencies using a frequency- or phase-locked loop using a frequency divider or counter in the loop
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S323/00—Electricity: power supply or regulation systems
    • Y10S323/907—Temperature compensation of semiconductor

Abstract

The present invention presents a closed loop system that utilizes a non-linear reference to control a power amplifier's output power in order to obtain a linear transfer function of dB per adjustment step of a reference input. The closed loop system demonstrates that each non-linear stage/step in an automatic gain control system can create a linear closed loop system when using a non-linear reference. The closed loop system of the present invention eliminates the need for a linearization circuit for the system's power detector. The closed loop system may be used with most power amplifiers when linear control in terms of dB vs. adjustment setting of the input reference signal is desired. Output power in terms of dBms can be accurately set in linear steps where power control over a wide dynamic range is desired.
CA002298928A 1999-02-18 2000-02-17 Linear power control loop Expired - Fee Related CA2298928C (en)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
US12064199P 1999-02-18 1999-02-18
US60/120,641 1999-02-18
US09/491,538 2000-01-26
US09/491,538 US6417729B1 (en) 1999-02-18 2000-01-26 Linear power control loop

Publications (2)

Publication Number Publication Date
CA2298928A1 true CA2298928A1 (en) 2000-08-18
CA2298928C CA2298928C (en) 2003-07-29

Family

ID=31886295

Family Applications (4)

Application Number Title Priority Date Filing Date
CA002298927A Expired - Fee Related CA2298927C (en) 1999-02-18 2000-02-17 Aparatus and method for reducing oscillator frequency pulling during am modulation
CA002298928A Expired - Fee Related CA2298928C (en) 1999-02-18 2000-02-17 Linear power control loop
CA002298926A Expired - Fee Related CA2298926C (en) 1999-02-18 2000-02-17 Temperature compensated power detector
CA002298992A Expired - Fee Related CA2298992C (en) 1999-02-18 2000-02-18 Temperature compensated high performance oscillator

Family Applications Before (1)

Application Number Title Priority Date Filing Date
CA002298927A Expired - Fee Related CA2298927C (en) 1999-02-18 2000-02-17 Aparatus and method for reducing oscillator frequency pulling during am modulation

Family Applications After (2)

Application Number Title Priority Date Filing Date
CA002298926A Expired - Fee Related CA2298926C (en) 1999-02-18 2000-02-17 Temperature compensated power detector
CA002298992A Expired - Fee Related CA2298992C (en) 1999-02-18 2000-02-18 Temperature compensated high performance oscillator

Country Status (2)

Country Link
US (4) US6321074B1 (en)
CA (4) CA2298927C (en)

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Also Published As

Publication number Publication date
CA2298928C (en) 2003-07-29
CA2298927C (en) 2006-11-14
US6297708B1 (en) 2001-10-02
CA2298926C (en) 2002-12-31
CA2298927A1 (en) 2000-08-18
CA2298926A1 (en) 2000-08-18
CA2298992A1 (en) 2000-08-18
US6373236B1 (en) 2002-04-16
US6321074B1 (en) 2001-11-20
US6417729B1 (en) 2002-07-09
CA2298992C (en) 2005-07-12

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