CN2438275Y - Digital direct frequency synthesis and phase-locked loop type wide-band frequency synthesizer - Google Patents
Digital direct frequency synthesis and phase-locked loop type wide-band frequency synthesizer Download PDFInfo
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- CN2438275Y CN2438275Y CN 00246137 CN00246137U CN2438275Y CN 2438275 Y CN2438275 Y CN 2438275Y CN 00246137 CN00246137 CN 00246137 CN 00246137 U CN00246137 U CN 00246137U CN 2438275 Y CN2438275 Y CN 2438275Y
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Abstract
The utility model discloses a digital direct frequency synthesis and phase-locked loop type wide-band frequency synthesizer, which is composed of a front frequency dividing component, a phase discriminator, a voltage control oscillation component, a program frequency division component, a DDS, an amplifier, an adder, an electronic switch, a sampling and holding component, etc., wherein, a big step frequency synthesizer and a minimum frequency step part are used for forming a small step wide-band frequency synthesizer which reserves the low phase noise of the DDS and leads stray power to be inhibited out of a loop bandwidth without increase in the loop bandwidth. The utility model is provided with a circuit, and is especially suitable for serving as a frequency source in a communications device, with the characteristics of simple structure, easy debugging, easy production, low cost, etc.
Description
The utility model relates to the frequency source in a kind of radio communication field, is specially adapted to require to provide low phase noise, low spuious broadband small step to advance frequency synthesizer.
It is a lot of to be used in the radio engineering at present realizing that the method for frequency synthesizer is advanced in the broadband small step, mainly contain following several method: a kind of is to adopt phase-locked loop to realize, but its volume, power consumption, reliability, minimum step, phase noise, spuious etc. is difficult to take into account; Second kind is to adopt the direct frequency synthesis technique of simulation, and this scheme also has same problem; The third is to adopt directly frequency synthesis technique of numeral, hereinafter to be referred as DDS, we know that DDS has extremely low phase noise, minimum frequency step, the frequency inverted time that is exceedingly fast, but also exist some the point on spuious bigger, spuious meeting is more serious when crystal oscillator frequency improves, it is proper when following that this scheme is used in tens MHz, and it spuious just is difficult to satisfy high performance index when being used for MHz up to a hundred.
The purpose of this utility model is to avoid the weak point in the above-mentioned background technology and the advantage of a kind of extremely low phase noise that had both kept DDS, minimum frequency step is provided, the stray power that can make DDS again PLL loop bandwidth with the interior numeral that does not increase, beyond PLL loop bandwidth, is inhibited directly frequency synthesis add the wideband frequency synthesizer of phase-locked ring type; Characteristics such as and the utility model also has circuit and simple in structure, and easily debugging is produced, and volume is little, and cost is low are especially suitable for use as the frequency source in the communication equipment.
Design theory of the present utility model is as follows:
We know the restriction that is subjected to the principle of DDS own, and the output of DDS certainly exists spuious.Adopting DDS to add in the scheme of phase-locked loop, the scheme that is added to phaselocking frequency multiplier with the output of DDS is the most popular, to spuious when less demanding, this scheme can also be used, but when relatively tight, will increase at the power of loop bandwidth with interior spuious and phase noise according to phase-locked principle to spuious requirement
P,
In the formula (1):
P is that spuious and the relative recruitment N of phase noise power are that the final frequency multiplication of DDS output frequency is than by formula (1) as can be known, when final frequency multiplication is big frequently, be subjected to the restriction of phase-locked loop self character, the spuious of scheme that is added to phaselocking frequency multiplier with the output of DDS can not be done well; And the good phase noise performance of DDS can not exist yet.The output frequency of the scheme DDS that the utility model adopts can not double, and can also be by being added to behind the frequency division on the addition phase-locked loop during conditions permit again, and loop bandwidth also will be decayed with the power of interior spuious and phase noise like this
In the formula (2):
P be spuious and relative attenuation N phase noise power the final frequency dividing ratio that is the DDS output frequency hence one can see that adopts the utility model to avoid directly locking times DDS to cause in the deterioration of PLL loop bandwidth with interior spuious and phase noise, thereby provide the micro-stepping of a kind of broadband to advance to have the frequency source of outstanding spuious and phase noise.
The purpose of this utility model is achieved in that it is by prescalar 1, phase discriminator 2, loop filter 3, voltage controlled oscillator 4, frequency configuration device 5, program divider 6, Direct Digital Frequency Synthesizers 7, low pass filter 8, amplification shaping device 9, frequency mixer 10, isolated amplifier 11, voltage controlled oscillator 12, low pass filter 13, amplification shaping device 14, phase frequency detector 15, loop filter 16, adder 17, electronic switch 18, lock detector 19, electronic switch 20, sampling holder 21, multivibrator 22, with door 23, power supply 24, crystal oscillator 25, adjustable voltage generator 26 is formed.Wherein output 1 pin of crystal oscillator 25 links to each other with input 1 pin of prescalar 1, output 2 pin of crystal oscillator 25 link to each other with input 2 pin of Direct Digital Frequency Synthesizers 7, output 1 pin of frequency configuration device 5 links to each other with input 2 pin of program divider 6, output 2 pin of frequency configuration device 5 link to each other with input 1 pin of Direct Digital Frequency Synthesizers 7, output 2 pin of prescalar 1 link to each other with input 1 pin of phase discriminator 2, output 3 pin of phase discriminator 2 link to each other with input 1 pin of loop filter 3, output 2 pin of loop filter 3 link to each other with input 1 pin of voltage controlled oscillator 4, output 2 pin of voltage controlled oscillator 4 link to each other with input 1 pin of program divider 6, output 3 pin of program divider 6 link to each other with input 2 pin of phase discriminator 2, output 3 pin of Direct Digital Frequency Synthesizers 7 link to each other with input 1 pin of low pass filter 8, output 2 pin of low pass filter 8 link to each other with input 1 pin of amplification shaping device 9, output 2 pin of amplification shaping device 9 link to each other with input 1 pin of phase frequency detector 15, output 4 pin of phase frequency detector 15 link to each other with input 1 pin of loop filter device 16, output 2 pin of loop filter device 16 link to each other with input 1 pin of adder 17, output 3 pin of adder 17 link to each other with input 1 pin of voltage controlled oscillator 12, output 2 pin of voltage controlled oscillator 12 link to each other with input 1 pin of isolated amplifier 11, output 3 pin of voltage controlled oscillator 12 are connected with output port A, output 2 pin of isolated amplifier 11 link to each other with input 1 pin of frequency mixer 10, output 3 pin of frequency mixer 10 link to each other with input 1 pin of low pass filter 13, output 2 pin of low pass filter 13 link to each other with input 1 pin of amplification shaping device 14, output 2 pin of amplification shaping device 14 link to each other with input 2 pin of phase frequency detector 15, output 3 pin of phase frequency detector 15 link to each other with input 1 pin of lock detector 19, output 2 pin of lock detector 19 with link to each other with input 1 pin of door 23, output 3 pin of lock detector 19 link to each other with input 1 pin of electronic switch 18, output 2 pin of electronic switch 18 link to each other with input 1 pin of multivibrator 22, output 2 pin of multivibrator 22 with link to each other with input 2 pin of door 23, link to each other with input 1 pin of electronic switch 20 with output 4 pin of door 23, output 2 pin of electronic switch 20 link to each other with loop filter 16 inputs 3 pin, link to each other with input 1 pin of sampling holder 21 with output 3 pin of door 23, output 2 pin of sampling holder 21 link to each other with input 2 pin of adder 17, output 3 pin of loop filter 3 link to each other with input 3 pin of sampling holder 21, the output 1 pin voltage VC3 end of adjustable voltage generator 26 links to each other the output VC1 of power supply 24 with the input 3 pin voltage VC3 end of electronic switch 20, VC2 links to each other with the input of corresponding power supplys at different levels.
The purpose of this utility model can also reach by following measure: loop filter 16 is made up of resistance R 5, R9, R10, R11, R12, R13, capacitor C 3, C4, C5, C7 and operational amplifier N2; Adder 17 is made up of resistance R 7, R8, R14, R17 and operational amplifier N1; Electronic switch 18 is made up of switch S 4; Lock detector 19 is made up of resistance R 15, R16, R18, potentiometer RP2, voltage-stabiliser tube W1, capacitor C 6 and operational amplifier N3: electronic switch 20 is made up of switch S 2, S3; Sampling holder 21 is made up of triode V1, V2, resistance R 1, R2, R3, switch S 1, capacitor C 1; Multivibrator 22 is made up of resistance R 19, R20, capacitor C 8, C9 and multi-harmonic-oscillations integrated package D2; With door 23 by forming with door integrated package D1; Adjustable voltage generator 26 is by resistance R 4, R6, potentiometer RP1 and amplifier N4 form, wherein output 3 pin of loop filter 3 are connected with the base stage of triode V1, what the collector electrode of triode V1 connect power supply 24 goes out to hold the VC1 voltage end, one end of the emitter of triode V1 and resistance R 1, input 1 pin of switch S 1 also connects, the other end earth terminal of resistance R 1, output 3 pin of switch S 1 are connected with an end of resistance R 2 capacitor C 1 and the base stage of triode V2, resistance R 2, the other end earth terminal of capacitor C 1, what the collector electrode of triode V2 connect power supply 24 goes out to hold the VC1 voltage end, the emitter of triode V2 and resistance R 3, R14 one end connects, the other end earth terminal of resistance R 3, the other end of resistance R 14 is connected with positive input terminal 2 pin of operational amplifier N1; The termination power 24 of potentiometer RP1 go out to hold the VC1 voltage end, other end earth terminal, the middle output of potentiometer RP1 is connected with an end of resistance R 4, the other end of resistance R 4 is connected with positive input terminal 1 pin of operational amplifier N4, negative input end 2 pin of operational amplifier N4 are connected with output 5 pin of operational amplifier N4 by resistance R 6 backs, and output 5 pin of operational amplifier N4 are connected with input 3 pin of switch S 3; Earth terminal behind the negative input end 1 pin series resistor R8 of operational amplifier N1 is connected with output 5 pin behind negative input end 1 pin of the operational amplifier N1 series resistor R7 in parallel, and output 5 pin of operational amplifier N1 are connected with input 1 pin of voltage controlled oscillator 12; Behind the output 4 pin series resistor R9 of phase frequency detector 15 with capacitor C 4, resistance R 5 one ends also connect, the other end earth terminal of capacitor C 4, the other end of resistance R 5 and switch S 2 are gone into end 1 pin, resistance R 10 1 ends, negative input end 1 pin of operational amplifier N2 is connected in parallel, behind the output 5 pin series resistor R11 of phase frequency detector 15 with capacitor C 5, resistance R 12 1 ends also connect, the other end earth terminal of capacitor C 5, the other end of resistance R 12 and switch S 3 are gone into end 1 pin, resistance R 13 1 ends, positive input terminal 2 pin of operational amplifier N2 are connected in parallel, resistance R 13 other ends serial connection capacitor C 7 back earth terminals, the other end of resistance R 10 serial connection capacitor C 3 backs and switch S 3 go into end 3 pin, output 5 pin of operational amplifier N2 and an end of resistance R 17 are connected in parallel, positive input terminal 2 pin and resistance R 14 1 ends of resistance R 17 other ends and operational amplifier N1 are connected in parallel switch S 1, S2, each control end 2 pin of S3 be connected with output 3 pin of door integrated package D1; The output 3 of phase frequency detector 15,6 connect together afterwards and resistance R 15, the end of R16 connects, the other end earth terminal of resistance R 15, the other end of resistance R 16 is connected with an end of capacitor C 6 and positive input terminal 1 pin of operational amplifier N3, the other end earth terminal of capacitor C 6, after going out to hold VC2, the input termination power 24 of potentiometer RP2 is connected in series capacitor C 11 earth terminals again, another input end grounding end, the middle output of potentiometer RP2 is connected with negative input end 2 pin of operational amplifier N3, the end of the output 5 pin connecting resistance R18 of operational amplifier N3, the voltage stabilizing end of the other end of resistance R 18 and voltage-stabiliser tube W1, control end 2 pin of switch S 4, be connected in parallel the positive ending grounding end of voltage-stabiliser tube W1 with input 2 pin of door integrated package D1; Power supply 24 goes out to hold 4 of VC2 voltage end and multi-harmonic-oscillations integrated package D2,8 bipods and meet again series resistor R19 after be connected with 7 pin of multi-harmonic-oscillations integrated package D2,2 of multi-harmonic-oscillations integrated package D2, series resistor R20 was connected with 7 pin of multi-harmonic-oscillations integrated package D2 after 6 bipods connected together, 2 of multi-harmonic-oscillations integrated package D2,6 bipods are also gone into end 1 pin with switch S 4, one end of capacitor C 9 is connected in parallel, switch S 4 is gone into end 3 pin, the other end earth terminal of capacitor C 9,5 pin serial connection capacitor C, the 8 back earth terminals of multi-harmonic-oscillations integrated package D2, output 3 pin of multi-harmonic-oscillations integrated package D2 be connected with another one input 1 pin of door integrated package D1, the 1 pin earth terminal of multi-harmonic-oscillations integrated package D2, operational amplifier N1 to N4 are respectively gone into to hold 3 pin and power supply 24 to go out to hold the VC1 voltage end and are connect, respectively go into end 4 pin and earth terminal and connect.
The utility model has been compared following advantage with background technology:
1. the addition phase-locked loop that frequency synthesizer is advanced in the big step frequency synthesizers that adopted frequency mixer 10, isolated amplifier 11, voltage controlled oscillator 12, low pass filter 13, amplification shaping device 14, phase frequency detector 15, loop filter 16, adder 17, electronic switch 18, lock detector 19, electronic switch 20, sampling holder 21, multivibrator 22 in the utility model, formed with door 23 and micro-stepping, thus realized that the interior micro-stepping of broadband advances.Because micro-stepping is advanced frequency synthesizer (DDS) frequency and is not doubly taken advantage of in the loop bandwidth of addition phase-locked loop, so the spuious and phase noise of DDS can not increase in the loop bandwidth of addition phase-locked loop, and the spuious and phase noise of DDS also can be suppressed outside the loop bandwidth of addition phase-locked loop.Thereby the utility model has the spurious performance that many better than background technology on spurious performance.
2. the integrated degree height of the used components and parts of the utility model components and parts are not had harsh requirement, and volume is little, and is strong to adaptive capacity to environment, and wide practical value is arranged on engineering.
3. the utility model simple structure, circuit are simple and easy to adjust, and be with low cost, has application value.
Below in conjunction with accompanying drawing the utility model is described in further detail.
Fig. 1 is an electric functional-block diagram of the present utility model.
Fig. 2 be loop filter 16 of the present utility model, adder 17, electronic switch 18, lock detector 19, electronic switch 20, sampling holder 21, multivibrator 22, with a kind of embodiment electrical schematic diagram of door 23, adjustable voltage generator 26.
With reference to Fig. 1, Fig. 2, the utility model is by prescalar 1, phase discriminator 2, loop filter 3, voltage controlled oscillator 4, frequency configuration device 5, program divider 6, Direct Digital Frequency Synthesizers 7, low pass filter 8, amplification shaping device 9, frequency mixer 10, isolated amplifier 11, voltage controlled oscillator 12, low pass filter 13, amplification shaping device 14, phase frequency detector 15, loop filter 16, adder 17, electronic switch 18, lock detector 19, electronic switch 20, sampling holder 21, multivibrator 22, with door 23, power supply 24, crystal oscillator 25, adjustable voltage generator 26 is formed.Wherein together form big step frequency synthesizer with frequency configuration device 5, power supply 24, crystal oscillator 25 by prescalar 1, phase discriminator 2, loop filter 3, voltage controlled oscillator 4, frequency configuration device 5, program divider 6; Its effect is for whole frequency synthesizer provides big frequency step, thereby covers whole required frequency range.Wherein together form micro-stepping and advance frequency synthesizer with Direct Digital Frequency Synthesizers (being called for short DDS) 7, low pass filter 8 by frequency configuration device 5, power supply 24, crystal oscillator 25; Its effect is to advance for whole frequency synthesizer provides the micro-stepping that covers between any two adjacent big frequency step, thereby the realization micro-stepping is advanced in whole required frequency range.Crystal oscillator 25 provides the derived reference signal of high stable for whole frequency synthesizer; Frequency configuration device 5 is provided with interface for the frequency that frequency synthesizer is set provides, and it can be microcomputer, also can be coding disk; The effect of amplification shaping device 9 and amplification shaping device 14 provides suitable level and gives phase frequency detector 15, and 9 couples of DDS7 of amplification shaping device spuious also has certain inhibitory action; Wherein frequency mixer 10, isolated amplifier 11, voltage controlled oscillator 12, low pass filter 13, amplification shaping device 14, phase frequency detector 15, loop filter 16 constitute the addition phase-locked loop, its effect is that the micro-stepping that big stepping that big step frequency synthesizer is provided, wide coverage and DDS7 provide advances organically to combine, thereby realizes that in whole required frequency range micro-stepping advances; By adder 17, electronic switch 18, lock detector 19, electronic switch 20, sampling holder 21, multivibrator 22, constitute the sub-scanning circuit with door 23, adjustable voltage generator 26, its effect be guarantee the addition phase-locked loop when frequency inverted correct locking and since rescaning during losing lock that a variety of causes causes catch.Universal circuit action principle in " frequency synthesis technique " book that the principle usage that prescalar 1 in the big step frequency synthesizer of frequency synthesizer, phase discriminator 2, loop filter 3, voltage controlled oscillator 4, program divider 6 and frequency configuration device 5, power supply 24, crystal oscillator 25 each parts are advanced in the broadband micro-stepping in embodiment the utility model was all published with reference to the People's Telecon Publishing House in 84 years, each component circuitry all adopts the general corresponding integrated circuit of market sale to make.The selection of DDS7 can be with reference to the circuit reference of manufacturers such as U.S. AMD.The action principle of addition phase-locked loop is also with reference to the universal circuit action principle in " frequency synthesis technique " book of People's Telecon Publishing House's publication in 84 years and the general corresponding integrated circuit and the element manufacturing of market sale.It is as follows that simple action principle is retouched art: the output frequency of suppose DDS7 is FD, and the output frequency of step frequency synthesizer is F greatly
l, the output frequency of voltage controlled oscillator 12 is F
o, the output frequency of amplification shaping device 14 is F
A, according to the operation principle of phase-locked loop, behind loop-locking, F
A=F
DF
A=F
o-F
l(or F
A=F
l-F
oBut this moment loop filter 16 setting and F
A=F
o-F
lAnti-phase), so output frequency F
o=F
l+ F
A=F
l+ F
D, this shows that the addition phase-locked loop finished the addition of the output frequency of the output frequency of big step frequency synthesizer and DDS.When the loop losing lock, establish F
l＞F
o, the output frequency F of amplification shaping device 14 then
A=F
l-F
o, work as F
A＞F
DThe time, because releasing the output level of loop filter 16, the frequency discrimination effect of phase frequency detector 15 descends, release the output frequency F of voltage controlled oscillator 12 again
oDescend, by the output frequency F of amplification shaping device 14
A=F
l-F
o, release F again
AIncrease F after the output level of loop filter 16 drops to nadir
AJust basicly stable, the addition phase-locked loop can not gone into lock; When the loop losing lock, establish F
l＜F
o, the output frequency F of amplification shaping device 14 then
A=F
l-F
o, if F
AGreater than the cut-off frequency of low pass filter 13, then can release equally, rise to behind the highest output level of amplifier just basicly stablely up to the output level of loop filter 16, the addition phase-locked loop can not gone into lock yet; The addition phase-locked loop can oneself be gone into the scope of lock for working as F
l＞F
oThe time be F
l-F
o＜F
D, work as F
l＜F
oThe time be F
o-F
l＜F
L, F wherein
LCut-off frequency for low pass filter 13.So from the above mentioned, the addition phase-locked loop must additional scanning circuit ability steady operation.Fig. 1 is an electric functional-block diagram of the present utility model, and big step frequency synthesizer, micro-stepping that embodiment forms are advanced frequency synthesizer, addition phase-locked loop, sub-scanning circuit by Fig. 1 frame principle figure connection line, forms the utility model.
Loop filter 16 of the present utility model is made up of resistance R 5, R9, R10, R11, R12, R13, capacitor C 3, C4, C5, C7 and operational amplifier N2; Adder 17 is made up of resistance R 7, R8, R14, R17 and amplifier N1; Electronic switch 18 is made up of switch S 4; Lock detector 19 is made up of resistance R 15, R16, R18, potentiometer RP2, voltage-stabiliser tube W1, capacitor C 6 and operational amplifier N3; Electronic switch 20 is made up of switch S 2, S3; Sampling holder 21 is made up of triode V1, V2, resistance R 1, R2, R3, switch S 1, capacitor C 1; Multivibrator 22 is made up of resistance R 19, R20, capacitor C 8, C9 and a multi-harmonic-oscillations integrated package D2; With door 23 by forming with door D1, adjustable voltage generator 26 is made up of resistance R 4, R6, potentiometer RP1 and amplifier N4.The effect of lock detector 19 be right judgement addition phase-locked loop go into whether to lock, its essence uses amplifier N3 as the univoltage comparator exactly, goes out level ' 1 ' when addition phase-locked loop losing lock, level ' 0 ' when the addition phase-locked loop goes into to lock.The effect of multivibrator 22 is to produce square wave oscillation.The effect of electronic switch 18 be when the addition phase-locked loop go into to lock the time (level ' 0 '), make multivibrator 22 failures of oscillations, disturb to avoid the output of addition phase-locked loop formed; When addition phase-locked loop losing lock, make multivibrator 22 produce square wave oscillation, thereby form the scanning of presetting of addition phase-locked loop.With the effect of door 23 be when the addition phase-locked loop goes into to lock (control level ' 0 '), no matter which kind of state the output that makes multivibrator 22 is, scanning is stopped; When addition phase-locked loop losing lock, thereby make the preset scanning of the output of multivibrator 22 by formation addition phase-locked loop.The effect of electronic switch 20 is when addition phase-locked loop losing lock, (when going out level ' 1 ' with door 23) presets an initial scanning voltage to loop filter 16 under the control of multivibrator 22, then (when going out level ' 0 ' with door 23) disconnects and presetting under the control of multivibrator 22, run-down allow loop filter 16 under the control of phase frequency detector 15, scan, if can not go into to be locked in to repeat under the control of multivibrator 22 to preset the process of scanning until going into lock; When the addition phase-locked loop go into to lock the time, disconnect prefabricatedly with door 23 (going out level ' 0 ') with door 23, loop filter 16 is worked normally.The effect of sampling holder 21 is when addition phase-locked loop losing lock, (when going out level ' 1 ' with door 23) samples to the output voltage of the loop filter 3 of big step frequency synthesizer under the control of multivibrator 22, sampling holder 21 enters hold mode then (to go out level ' 0 ' with door 23) under the control of multivibrator 22, if the addition phase-locked loop is gone into lock during this period, the electric charge that sampling holder 21 is kept in the capacitor C 1 just slowly bleeds off by triode V1, resistance R 1, is 0V up to the output voltage of sampling holder 21; If the addition phase-locked loop is not gone into lock during this period, after being kept at electric charge in the capacitor C 1 and bleeding off sub-fraction, sampling holder 21 enters sampling again (to go out level ' 1 ' with door 23) under the control of multivibrator 22.The effect of adder 17 is output voltage homophase additions of finishing the output voltage of sampling holder 21 and loop filter 16.The effect of adjustable voltage generator 26 is the variable voltage VC3 that produce low output resistance.Operational amplifier N3, N4 among the embodiment adopts the integrated package of a commercially available TL072 type to realize; Operational amplifier N1, N2 adopt the integrated package of a commercially available NE5534 type to realize respectively; Potentiometer RP1, RP2 are realized by 3296 commercially available type multiturn potentiometers; Switch S 4, S3 adopt the integrated electronic switch of a commercially available MAX325 type to realize, the S4 normally closed switch of MAX325; Switch S 1, S2 adopt the integrated electronic switch of a commercially available MAX323 type to realize; Multi-harmonic-oscillations integrated package D2 adopts the integrated-optic device of a NE555 type to realize; Adopt the integrated-optic device of a commercially available 74HC08 type to realize with door 23; Triode V1, V2 all adopt the transistor of common commercially available BY316 type to realize; Voltage-stabiliser tube W1 adopts the voltage-stabiliser tube of a commercially available 2CW53 type to realize.
Resistance R in the utility model circuit, capacitor C components and parts all adopt commercially available general Surface Mount Component, to make.Power supply 24 adopts commercially available general D.C. regulated power supply.Its output VC1 is+15V voltage that its output VC2 is+5V voltage that the power supplys that provide at different levels are provided.
Because varied property of electronic product, so the utility model can also adopt the embodiment of alternate manner, as: sampling holder 21 also has the discrete component of other form or has ready-made integrated circuit to realize; Adder 17 also can be realized with the anti-phase addition of amplifier or with discrete component; Also can add not gate again with NAND gate with door 23 realizes; Lock detector 19 also can be realized with ready-made comparator or with discrete component except that realizing with amplifier; Multivibrator 22 also can be realized with the multivibrator of other form except that realizing with multi-harmonic-oscillations integrated package D2, but Fig. 2 only shows a kind of embodiment of all implementations.
Operation principle of the present utility model is as follows: when frequency configuration, after the phase-locked loop of big step frequency synthesizer is gone into lock, if the addition phase-locked loop is not gone into lock, lock detector 19 output levels ' 1 ', switch S 4 disconnects, multivibrator 22 produces square wave oscillation, square wave with door 23 output homophases, the square wave level be ' 1 ' during, thereby finish with switch S 1 conducting of door 23 output control sampling holders 21 output voltage of the loop filter 3 of big step frequency synthesizer is sampled, while control switch S3, S2 makes loop filter 16 during this period as voltage follower output adjustable voltage generator 26 voltage VC3, the output voltage of adder 17 just contains the control voltage relevant with answering output frequency like this, the output voltage of adder 17 is added on the voltage controlled oscillator 12, and the output frequency that makes voltage controlled oscillator 12 is always greater than the output frequency (this can obtain by the potentiometer RP1 that adjusts adjustable voltage generator 26) of big step frequency synthesizer; It at the square wave level moment of ' 0 ', switch S 1, S2, S3 disconnect, because the voltage on capacitor C 1, C3, the C7 can not suddenly change, so this moment, the output voltage of adder 17 still kept original magnitude of voltage, the output frequency of voltage controlled oscillator 12 still keeps original frequency, so the output frequency of amplification shaping device 14 output frequency that equals voltage controlled oscillator 12 subtracts the output frequency of big step frequency synthesizer; The square wave oscillation level be ' 0 ' during, thereby cut-off switch S1, S2, S3 make sampling holder 21 be in hold mode, loop filter 16 works as real loop filter simultaneously, closed phase-locked loop, under the effect of phase frequency detector 15, the output voltage of adder 17 just changes towards the direction of correct locking, until the addition phase-locked loop is gone into lock; After loop is gone into lock, lock detector 19 output levels ' 0 ', switch S 4 conductings, multivibrator 22 failures of oscillations, with door 23 outputs ' 0 ' level, thereby cut-off switch S1 makes sampling holder 21 be in hold mode, the electric charge that sampling holder 21 is kept in the capacitor C 1 just passes through triode V1, resistance R 1 slowly bleeds off, therefore the output voltage of sampling holder 21 slowly descends up to reducing to 0V, simultaneously the output voltage of loop filter 16 only contains output voltage from loop filter 16 because the effect of loop is slowly risen up to the output voltage of adder 17.If do not have reason addition phase-locked loop such as output not go into lock owing to DDS, in the repetitive process that the addition phase-locked loop just is in sampling, presets and keeps, scans under the control of multivibrator 22, go into to lock until loop.
Mounting structure of the present utility model is as follows: whole machine installation is that four layers of 120 * 95mm are printed on the version at a block length * wide, and printing version, to be installed in a long * wide * height be in the shielding box of 120 * 95 * 19mm.Be isolated into five parts printing version in the shielding box: the printing version of the prescalar 1 among Fig. 1, phase discriminator 2, loop filter 3, program divider 6, Direct Digital Frequency Synthesizers (DDS) 7, low pass filter 8 takies the isolated part of a block length in the box * wide 85 * 35mm of being; Each takies the isolated part of a block length in the shielding box * wide 28 * 35mm of being respectively the printing version of voltage controlled oscillator 4, voltage controlled oscillator 12; Amplification shaping device 9, amplification shaping device 14, phase frequency detector 15, loop filter 16, adder 17, electronic switch 18, lock detector 19, electronic switch 20, sampling holder 21, multivibrator 22, take the isolated part of a block length in the shielding box * wide 72 * 51mm of being jointly with the printing version of door 23, adjustable voltage generator 26; The printing version of frequency mixer 10, isolated amplifier 11, low pass filter 13 takies the isolated part of a block length in the shielding box * wide 39 * 17mm of being; The output SMA socket of voltage controlled oscillator 12 is installed on the box wall of shielding box, the SMA socket that outputs to the wideband frequency synthesizer of crystal oscillator 25, frequency configuration device 5, power supply 24 output to the flat socket of 20 cores of wideband frequency synthesizer, assembly cost utility model device.
Claims (2)
1. one kind by prescalar (1), phase discriminator (2), loop filter (3), voltage controlled oscillator (4), frequency configuration device (5), program divider (6), Direct Digital Frequency Synthesizers (7), low pass filter (8), amplification shaping device (9), frequency mixer (10), isolated amplifier (11), voltage controlled oscillator (12), low pass filter (13), amplification shaping device (14), phase frequency detector (15), power supply (24), the direct frequency synthesis of the numeral that crystal oscillator (25) is formed adds the wideband frequency synthesizer of phase-locked ring type, it is characterized in that loop filter device (16) in addition, adder (17), electronic switch (18), lock detector (19), electronic switch (20), sampling holder (21), multivibrator (22), with door (23), adjustable voltage generator (26) is formed; Wherein output 1 pin of crystal oscillator (25) links to each other with input 1 pin of prescalar (1), output 2 pin of crystal oscillator (25) link to each other with input 2 pin of Direct Digital Frequency Synthesizers (7), output 1 pin of frequency configuration device (5) links to each other with input 2 pin of program divider (6), output 2 pin of frequency configuration device (5) link to each other with input 1 pin of Direct Digital Frequency Synthesizers (7), output 2 pin of prescalar (1) link to each other with input 1 pin of phase discriminator (2), output 3 pin of phase discriminator (2) link to each other with input 1 pin of loop filter (3), output 2 pin of loop filter (3) link to each other with input 1 pin of voltage controlled oscillator (4), output 2 pin of voltage controlled oscillator (4) link to each other with input 1 pin of program divider (6), output 3 pin of program divider (6) link to each other with input 2 pin of phase discriminator (2), output 3 pin of Direct Digital Frequency Synthesizers (7) link to each other with input 1 pin of low pass filter (8), output 2 pin of low pass filter (8) link to each other with input 1 pin of amplification shaping device (9), output 2 pin of amplification shaping device (9) link to each other with input 1 pin of phase frequency detector (15), output 4 pin of phase frequency detector (15) link to each other with input 1 pin of loop filter device (16), output 2 pin of loop filter (16) link to each other with input 1 pin of adder (17), output 3 pin of adder (17) link to each other with input 1 pin of voltage controlled oscillator (12), output 2 pin of voltage controlled oscillator (12) link to each other with input 1 pin of isolated amplifier (11), output 3 pin of voltage controlled oscillator (12) are connected with output port A, output 2 pin of isolated amplifier (11) link to each other with input 1 pin of frequency mixer (10), output 3 pin of frequency mixer (10) link to each other with input 1 pin of low pass filter (13), output 2 pin of low pass filter (13) link to each other with input 1 pin of amplification shaping device (14), output 2 pin of amplification shaping device (14) link to each other with input 2 pin of phase frequency detector (15), output 3 pin of phase frequency detector (15) link to each other with input 1 pin of lock detector (19), output 2 pin of lock detector (19) with link to each other with input 1 pin of door (23), output 3 pin of lock detector (19) link to each other with input 1 pin of electronic switch (18), output 2 pin of electronic switch (18) link to each other with input 1 pin of multivibrator (22), output 2 pin of multivibrator (22) with link to each other with input 2 pin of door (23), link to each other with input 1 pin of electronic switch (20) with output 4 pin of door (23), output 2 pin of electronic switch (20) link to each other with loop filter device (16) input 3 pin, link to each other with input 1 pin of sampling holder (21) with output 3 pin of door (23), output 2 pin of sampling holder (21) link to each other with input 2 pin of adder (17), output 3 pin of loop filter (3) link to each other with input 3 pin of sampling holder (21), the output 1 pin voltage VC3 end of adjustable voltage generator (26) links to each other the output VC1 of power supply (24) with the input 3 pin voltage VC3 end of electronic switch (20), VC2 links to each other with the input of corresponding power supplys at different levels.
2. direct frequency synthesis adds the wideband frequency synthesizer of phase-locked ring type according to claims 1 described a kind of numeral, it is characterized in that loop filter 16 is made up of resistance R 5, R9, R10, R11, R12, R13, capacitor C 3, C4, C5, C7 and operational amplifier N2; Adder (17) is made up of resistance R 7, R8, R14, R17 and operational amplifier N1; Electronic switch (18) is made up of switch S 4; Lock detector (19) by resistance R 15, R16, R18, potentiometer RP2, voltage-stabiliser tube W1, capacitor C 6 and operational amplifier N3 group or; Electronic switch (20) is made up of switch S 2, S3; Sampling holder (21) is made up of triode V1, V2, resistance R 1, R2, R3, switch S 1, capacitor C 1; Multivibrator (22) is made up of resistance R 19, R20, capacitor C 8, C9 and multi-harmonic-oscillations integrated package D2; With door (23) by forming with door integrated package D1; Adjustable voltage generator (26) is by resistance R 4, R6, potentiometer RP1 and operational amplifier N4 form, wherein output 3 pin of loop filter (3) are connected with the base stage of triode V1, what the collector electrode of triode V1 connect power supply (24) goes out to hold VC1, one end of the emitter of triode V1 and resistance R 1, input 1 pin of switch S 1 connects, the other end earth terminal of resistance R 1, output 3 pin and the resistance R 2 of switch S 1, one end of capacitor C 1 and the base stage of triode V2 connect, resistance R 2, the other end earth terminal of capacitor C 1, what the collector electrode of triode V2 connect power supply (24) goes out to hold VC1, the emitter of triode V2 and resistance R 3, R14 one end connects, the other end earth terminal of resistance R 3, the other end of resistance R 14 is connected with positive input terminal 2 pin of operational amplifier N1; The termination power (24) of potentiometer RP1 go out to hold VC1, other end earth terminal, the middle output of potentiometer RP1 is connected with an end of resistance R 4, the other end of resistance R 4 is connected with positive input terminal 1 pin of operational amplifier N4, negative input end 2 pin of operational amplifier N4 are connected with output 5 pin of operational amplifier N4 by resistance R 6 backs, and output 5 pin of operational amplifier N4 are connected with input 3 pin of switch S 3; Earth terminal behind the negative input end 1 pin series resistor R8 of operational amplifier N1 is connected with output 5 pin behind negative input end 1 pin of the operational amplifier N1 series resistor R7 in parallel, and output 5 pin of operational amplifier N1 are connected with voltage controlled oscillator (12) input 1 pin; Behind the output 4 pin series resistor R9 of phase frequency detector (15) with capacitor C 4, resistance R 5 one ends also connect, the other end earth terminal of capacitor C 4, the other end of resistance R 5 and switch S 2 are gone into end 1 pin, resistance R 10 1 ends, negative input end 1 pin of operational amplifier N2 is connected in parallel, behind the output 5 pin series resistor R11 of phase frequency detector (15) with capacitor C 5, resistance R 12 1 ends also connect, the other end earth terminal of capacitor C 5, the other end of resistance R 12 and switch S 3 are gone into end 1 pin, resistance R 13 1 ends, positive input terminal 2 pin of operational amplifier N2 are connected in parallel, resistance R 13 other ends serial connection capacitor C 7 back earth terminals, the other end of resistance R 10 serial connection capacitor C 3 backs and switch S 3 go into end 3 pin, output 5 pin of operational amplifier N2 and an end of resistance R 17 are connected in parallel, positive input terminal 2 pin and resistance R 14 1 ends of resistance R 17 other ends and operational amplifier N1 are connected in parallel switch S 1, S2, each control end 2 pin of S3 be connected with output 3 pin of door integrated package D1; The output 3 of phase frequency detector (15), 6 connect together afterwards and resistance R 15, the end of R16 connects, the other end earth terminal of resistance R 15, the other end of resistance R 16 is connected with an end of capacitor C 6 and positive input terminal 1 pin of operational amplifier N3, the other end earth terminal of capacitor C 6, after going out to hold the VC2 voltage end, the input termination power (24) of potentiometer RP2 is connected in series capacitor C 11 earth terminals again, another input end grounding end, the middle output of potentiometer RP2 is connected with negative input end 2 pin of operational amplifier N3, the end of the output 5 pin connecting resistance R18 of operational amplifier N3, the voltage stabilizing end of the other end of resistance R 18 and voltage-stabiliser tube W1, control end 2 pin of switch S 4, be connected in parallel the positive ending grounding end of voltage-stabiliser tube W1 with input 2 pin of door integrated package D1; Power supply (24) goes out to hold 4 of VC2 voltage end and multi-harmonic-oscillations integrated package D2,8 bipods and meet again series resistor R19 after be connected with 7 pin of multi-harmonic-oscillations integrated package D2,2 of multi-harmonic-oscillations integrated package D2, series resistor R20 was connected with 7 pin of multi-harmonic-oscillations integrated package D2 after 6 bipods connected together, 2 of multi-harmonic-oscillations integrated package D2,6 bipods are also gone into end 1 pin with switch S 4, one end of capacitor C 9 is connected in parallel, switch S 4 is gone into end 3 pin, the other end earth terminal of capacitor C 9,5 pin serial connection capacitor C, the 8 back earth terminals of multi-harmonic-oscillations integrated package D2, output 3 pin of multi-harmonic-oscillations integrated package D2 be connected with another one input 1 pin of door integrated package D1, the 1 pin earth terminal of multi-harmonic-oscillations integrated package D2, operational amplifier N1 to N4 are respectively gone into to hold 3 pin and power supply (24) to go out to hold the VC1 voltage end and are connect, respectively go into end 4 pin and earth terminal and connect.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 00246137 CN2438275Y (en) | 2000-08-10 | 2000-08-10 | Digital direct frequency synthesis and phase-locked loop type wide-band frequency synthesizer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 00246137 CN2438275Y (en) | 2000-08-10 | 2000-08-10 | Digital direct frequency synthesis and phase-locked loop type wide-band frequency synthesizer |
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| Publication Number | Publication Date |
|---|---|
| CN2438275Y true CN2438275Y (en) | 2001-07-04 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 00246137 Expired - Fee Related CN2438275Y (en) | 2000-08-10 | 2000-08-10 | Digital direct frequency synthesis and phase-locked loop type wide-band frequency synthesizer |
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| CN (1) | CN2438275Y (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7430265B2 (en) | 2002-06-27 | 2008-09-30 | Infineon Technologies Ag | Circuit arrangement provided with a phase-locked loop and transmitter-receiver with said circuit arrangement |
| CN1877998B (en) * | 2006-06-23 | 2010-05-12 | 北京航空航天大学 | Digital phase-locking loop for resistance vibration-pickup type silicon micro-mechanical resonate sensor |
| CN1866747B (en) * | 2006-06-23 | 2010-09-01 | 北京航空航天大学 | Digital phase-locked closed-loop of resistance vibration pickup type silicon micromechanical resonant sensor |
| CN105071804A (en) * | 2015-07-23 | 2015-11-18 | 中国电子科技集团公司第四十一研究所 | Low phase noise wideband microwave local oscillator source circuit and realization method thereof |
-
2000
- 2000-08-10 CN CN 00246137 patent/CN2438275Y/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7430265B2 (en) | 2002-06-27 | 2008-09-30 | Infineon Technologies Ag | Circuit arrangement provided with a phase-locked loop and transmitter-receiver with said circuit arrangement |
| CN1877998B (en) * | 2006-06-23 | 2010-05-12 | 北京航空航天大学 | Digital phase-locking loop for resistance vibration-pickup type silicon micro-mechanical resonate sensor |
| CN1866747B (en) * | 2006-06-23 | 2010-09-01 | 北京航空航天大学 | Digital phase-locked closed-loop of resistance vibration pickup type silicon micromechanical resonant sensor |
| CN105071804A (en) * | 2015-07-23 | 2015-11-18 | 中国电子科技集团公司第四十一研究所 | Low phase noise wideband microwave local oscillator source circuit and realization method thereof |
| CN105071804B (en) * | 2015-07-23 | 2018-04-10 | 中国电子科技集团公司第四十一研究所 | A kind of Low phase noise broadband microwave local oscillator source circuit and its implementation method |
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| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |