CN109104187A - A kind of full-digital broadband frequency synthesizer - Google Patents

A kind of full-digital broadband frequency synthesizer Download PDF

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Publication number
CN109104187A
CN109104187A CN201811075900.7A CN201811075900A CN109104187A CN 109104187 A CN109104187 A CN 109104187A CN 201811075900 A CN201811075900 A CN 201811075900A CN 109104187 A CN109104187 A CN 109104187A
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frequency
phase
digital
loop filter
frequency synthesizer
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CN109104187B (en
Inventor
王�锋
刘鹏远
柳鹏
韩翠娥
刘昉
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Army Engineering University of PLA
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Army Engineering University of PLA
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    • HELECTRICITY
    • H03ELECTRONIC CIRCUITRY
    • H03LAUTOMATIC CONTROL, STARTING, SYNCHRONISATION OR STABILISATION OF GENERATORS OF ELECTRONIC OSCILLATIONS OR PULSES
    • H03L7/00Automatic control of frequency or phase; Synchronisation
    • H03L7/06Automatic control of frequency or phase; Synchronisation using a reference signal applied to a frequency- or phase-locked loop
    • H03L7/16Indirect frequency synthesis, i.e. generating a desired one of a number of predetermined frequencies using a frequency- or phase-locked loop
    • H03L7/18Indirect 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
    • H03L7/1803Indirect 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 the counter or frequency divider being connected to a cycle or pulse swallowing circuit

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  • Stabilization Of Oscillater, Synchronisation, Frequency Synthesizers (AREA)

Abstract

The present invention is provided with programmable logic controller (PLC) in the circuit of frequency synthesizer, can be according to the real input signal situation of frequency synthesizer come the parameter of adjustment loop filter, and then enriches the function and adaptation range of traditional frequency synthesizer.Secondly, the present invention is also provided with the judgement that phase/frequency decision device to carry out input signal phase and frequency, the complexity and power consumption of circuit can be effectively reduced to avoid arithmetic operator and code conversion.

Description

A kind of full-digital broadband frequency synthesizer
Technical field
The present invention relates to a kind of frequency synthesizers, more particularly to a kind of digital wideband frequency synthesizer.
Background technique
Bandwidth is the mark that ULTRA-WIDEBAND RADAR is different from Narrow-band Radar, and ULTRA-WIDEBAND RADAR is capable of providing relative to Narrow-band Radar More target informations also just can be carried out more effective target identification.With the progress of Radar Signal Processing Technology, can handle The bandwidth of video signal is more and more wider, so that the original working frequency of radar frequency synthesizer and bandwidth are no longer satisfied ultra wide band The technical requirements of Connectors for Active Phased Array Radar.
Frequency synthesizer is Modern Communication System, radar, the Primary Component in test equipment, it may be possible to provide high-precision, high The frequency of stability.Since the concept for being put forward for the first time frequency synthesis from the 1930s, 3 kinds of basic frequencies have been formd Synthetic method: (1) Direct frequency synthesizer;(2) Phase locking frequency synthesis;(3) direct digital synthesis technique (DDS).The frequency of early stage Synthesizer uses Direct frequency synthesizer mode, their structures are simple, are easily achieved, but volume is big, at high cost.
A kind of frequency synthesizer is proposed in patent document CN201320570307.6.Frequency hopping of the invention is swashed using DDS The method of PLL is encouraged to realize the scheme of frequency synthesis, Frequency uses the direct producing method of DDS, fully demonstrates software wireless The flexibility of electricity and portability, frequency synthesizer possesses cracking locking time, and guarantees lesser spuious, accurate frequency Rate precision, a low noise of making an uproar, the excellent purity of frequency spectrum and wide frequency hopping range, have reached higher technical indicator.However the hair In bright equipment, circuit structure regular and rigid, flexibility is inadequate, and scalability is inadequate, can not according to different actual needs into Row adjustment.
Summary of the invention
The purpose of the present invention is overcoming above-mentioned the deficiencies in the prior art, a kind of structure novel is provided, is skillfully constructed frequency Synthesizer, can be by universal logic module and phase judging module come flexible setting frequency synthesizer as needed Every attribute, and then the function and adaptation range of traditional frequency synthesizer are enriched, greatly promote the flexibility of frequency synthesizer And tracking performance.
The present invention is realized by scheme below:
A kind of full-digital broadband frequency synthesizer, specifically includes: digital frequency phase detector, loop filter, number pressure Control oscillator, digital frequency divider, loop parameter controller, phase/frequency decision device, programmable logic controller (PLC);Digital frequency discrimination The output of phase discriminator is connected with phase/frequency decision device, phase/frequency decision device respectively with loop filter and programmable logic Controller is connected, and loop filter is connected with digital vco, and the output of voltage-controlled vibrator is connected with frequency divider, frequency divider All the way input signal of the output as digital frequency phase detector;The digital programmable logic controller and loop parameter simultaneously Controller is connected, and loop parameter controller is connected with loop filter.
Further, the digital frequency phase detector carries out frequency and phase to the output of input reference signal and frequency divider Compare, then obtains the signal that one represents phase/frequency error and give phase/frequency decision device;Phase/frequency decision device according to Error signal is adjudicated into property, obtains the court verdict of phase and frequency, and be sent respectively to loop filter and programmable logic Controller;Programmable logic controller (PLC) carries out the parameter tune of loop filter according to the court verdict of phase/frequency decision device It is whole, and the result of adjustment is sent to loop parameter controller, loop parameter controller carries out loop filter according to result Control.
Further, tunable resistance is provided in the loop filter, the loop parameter controller is by adjusting ring Tunable resistance in path filter adjusts the performance of loop filter.
Further, the digital frequency phase detector includes the pre- frequency division module of clock, multi-bit counter module, multi-bit register Module, Edge check module, while the pre- frequency division module of clock receives the clock signal of fixed crystal oscillator clock input, then by even Number, odd number, half-integer cascaded divider export reference clock signal, then export reference clock signal and give Edge check module With multi-bit counter module, Edge check receives feedback clock signal, then detects reference clock signal and feedback clock signal Edge, the signal of the phase/frequency error is obtained according to the edge situation of the two.
Further, four nor gates and two D flip-flops are specifically included in the circuit of phase/frequency decision device.
Further, the phase/frequency decision device include two logic circuits, described two logic circuits include two or Not circuit, wherein nor gate a input terminal receives the positive negative error signal of digital frequency phase detector output, another Input terminal receives the judgement period that a judgement clock is used to determine phase/frequency judgement;The output end of the logic circuit is made For the input terminal of D flip-flop, another input terminal connection judgement clock signal of D flip-flop, D flip-flop output height Low level obtains the signal after tracing compensation.
Further, the programmable logic controller (PLC) can be siemens PLC or mitsubishi FX2N or ABB AC500。
Further, the frequency synthesizer can be applied to airborne radar, trailer-mounted radar, aircraft radar and satellite radar.
Further, the digital frequency divider can be even number divider, odd divider, decimal frequency divider.
Compared with prior art, the present invention the beneficial effect is that:
Firstly, the present invention is provided with programmable logic controller (PLC) in the circuit of frequency synthesizer, it can be comprehensive according to frequency The real input signal situation of clutch carrys out the parameter of adjustment loop filter, so enrich traditional frequency synthesizer function and Adaptation range.
Secondly, the present invention is also provided with the judgement that phase/frequency decision device to carry out input signal phase and frequency, it can To avoid arithmetic operator and code conversion, the complexity and power consumption of circuit are effectively reduced.
Finally, frequency synthesizer flexible structure provided by the invention, complexity is low, low in energy consumption, full digital processing, has wide Wealthy application advantage and economic prospect.
Detailed description of the invention
Fig. 1 is the circuit structure diagram of frequency synthesizer of the present invention.
Fig. 2 is the circuit structure diagram of the digital frequency phase detector in frequency synthesizer of the present invention.
Fig. 3 is the circuit structure diagram of the phase/frequency decision device in frequency synthesizer of the present invention.
Specific embodiment
The following further describes the present invention with reference to the drawings.These attached drawings are simplified schematic diagram, only with the side of signal Formula illustrates basic structure of the invention, therefore it only shows the composition relevant to the invention.
With the continuous development of communication, DTV, satellite positioning, aerospace and remote control and telemetering technique, to frequency source Frequency stability, the purity of frequency spectrum, the requirement of frequency range and output frequency number it is higher and higher.In order to improve frequency stabilization Degree, through solving frequently with the methods of crystal oscillator, but it is not able to satisfy the requirement more than frequency number, therefore, a large amount of at present Using frequency synthesis technique.It, can be from the mark of a high stability and high accuracy by add to frequency, subtract, multiplication and division operation Quasi- frequency source generates different frequency largely with same stability and accuracy.Frequency synthesizer is from one or more The device of multi-frequency is generated in reference frequency.It is the essential Key Circuit of modern communication systems, is widely used in counting The fields such as word communication, satellite communication, radar, navigation, aerospace, remote-control romote-sensing and high-speed equipment instrument.To communicate as generation The information industry of watch is the most fast industry of contemporary development, and therefore, frequency synthesizer has also obtained very fast development, is formd perfect Series of products, the market demand are also especially big.
The technology complexity of frequency synthesizer is very high, have passed through and directly synthesizes analog frequency synthesizer, phase-lock frequency Three synthesizer, Direct Digital frequency synthesizer developing stage.And wherein phase-lock frequency synthesizer and Direct Digital frequency Rate synthesizer is paid close attention to by all circles, and is grown rapidly.
The present invention is based on current development trends and technology to need, and proposes the frequency that a kind of structure is simple, feature-rich Synthesizer.Below with reference to specific embodiment, the present invention will be described.
Embodiment one:
The circuit structure diagram of frequency synthesizer of the invention as shown in figure 1, specifically: digital frequency phase detector, loop Filter, digital vco, digital frequency divider, loop parameter controller, phase/frequency decision device, programmable logic control Device processed;The output of digital frequency phase detector is connected with phase/frequency decision device, phase/frequency decision device respectively with loop filtering Device is connected with programmable logic controller (PLC), and loop filter is connected with digital vco, the output of voltage-controlled vibrator with point Frequency device is connected, all the way input signal of the output of frequency divider as digital frequency phase detector;Digital programmable logic control simultaneously Device is connected with loop parameter controller, and loop parameter controller is connected with loop filter.
In the present invention, relevant digital frequency phase detector, digital vco, digital frequency divider all have high-resolution The characteristics of rate, High Linear, high complexity, with the process performance and precision of promotion signal, and increasing phase/frequency decision device can be with Arithmetic operator and code conversion are avoided, the complexity and power consumption of circuit structure are significantly reduced.
Further, digital frequency phase detector carries out the ratio of frequency and phase to the output of input reference signal and frequency divider Compared with then obtaining the signal that one represents phase/frequency error and give phase/frequency decision device;Phase/frequency decision device is according to accidentally Difference signal is adjudicated into property, obtains the court verdict of phase and frequency, and be sent respectively to loop filter and programmable logic control Device processed;Programmable logic controller (PLC) carries out the parameter adjustment of loop filter according to the court verdict of phase/frequency decision device, And the result of adjustment is sent to loop parameter controller, loop parameter controller controls loop filter according to result System.
Further, tunable resistance is provided in loop filter, loop parameter controller is by adjusting loop filter In tunable resistance adjust the performance of loop filter.
For different signals to be processed, the coverage area of bandwidth may be very big, comprehensive for traditional frequency For clutch, manageable bandwidth range suffers from the performance limitation of annular filter, and simple expansion ring-type is filtered On the one hand the process range of wave device will increase the cost of annular filter, can also reduce the processing accuracy of annular filter, and originally By increasing programmable logic controller in circuit in invention, programmable logic controller (PLC) is by receiving loop filter Input signal is in real time adjusted annular filter according to signal to be processed, can expand the place of annular filter in this way Bandwidth range is managed, the flexibility of synthesis filter is improved.
Fig. 2 shows the circuit structures of digital frequency phase detector used in the present invention, specifically include clock and divide in advance Module, multi-bit counter module, multi-bit register module, Edge check module, while the pre- frequency division module of clock receives fixed crystalline substance The clock signal that the clock that shakes inputs, then exports reference clock signal by even number, odd number, half-integer cascaded divider, then Reference clock signal is exported to Edge check module and multi-bit counter module, Edge check receives feedback clock signal, so The edge for detecting reference clock signal and feedback clock signal afterwards, obtains phase/frequency error according to the edge situation of the two Signal.
For digital frequency phase detector, the selection of the clock signal of reference is particularly significant, in number mirror of the invention In frequency phase discriminator, using even frequency division, the cascade of equal duty ratio frequency division by odd integers and half integer frequency divider is realized to fixed clock Frequency dividing obtain fixed duty cycle multidigit counting clock input.Control precision is improved in this way, while reducing realization difficulty.
In digital frequency phase detector of the invention simultaneously, Edge check module is also provided with to detect reference clock and feedback The edge of clock counts frequency difference when frequency is unlocked, exports frequency difference digital quantity;When Frequency Locking, to differ into Row counts, and completes the update to linear difference digital quantity in the rising edge of each reference clock.
Fig. 3 shows the circuit structure of phase/frequency decision device used in the present invention, and four are specifically included in circuit Nor gate and two D flip-flops.
Further, phase/frequency decision device includes two logic circuits 1 and logic circuit 2, and two logic circuits include two A OR-NOT circuit, wherein nor gate a input terminal receives the positive negative error signal of digital frequency phase detector output, in addition One input terminal receives the judgement period that a judgement clock is used to determine phase/frequency judgement;The output end of logic circuit is made For the input terminal of D flip-flop, another input terminal connection judgement clock signal of D flip-flop, D flip-flop output height Low level obtains the signal after tracing compensation.
Specifically, two logic circuits can all be resetted after each judgement by judgement clock signal to guarantee each Stable output is carried out when clock cycle starts, does not have dropping signal when next time update cycle, then logic circuit 1 is kept High level, and when adjudicating clock signal arrival rising edge, the decision circuit high level that then output frequency/phase rises;And such as Fruit only has dropping signal within time update cycle, then the high level of decision circuit final output frequency/phase decline.
If necessary to change the update cycle of decision circuit, then the frequency dividing ratio for only needing to change circuit can modify update Period.This design can effectively reduce the complexity of circuit and can work within any update cycle, convenient, spirit It is living, accurate, efficient.
Meanwhile specifically, the considerations of overall cost, quality, three aspect of performance, programmable logic controller (PLC) can be from west gate It is chosen in tri- models of AC500 of sub- S7-200 or mitsubishi FX2N or ABB.
Further, frequency synthesizer can be applied to airborne radar, trailer-mounted radar, aircraft radar and satellite radar.
Further, digital frequency divider can be even number divider, odd divider, decimal frequency divider.
The above describes the embodiments of the present invention, it should be appreciated to those skilled in the art that this is merely illustrative of, Those skilled in the art without departing from the principle and essence of the present invention, can make numerous variations to embodiment Or modification, but these change and modification each fall within protection scope of the present invention.

Claims (9)

1. a kind of full-digital broadband frequency synthesizer, characterized by comprising: digital frequency phase detector, loop filter, number Voltage controlled oscillator, digital frequency divider, loop parameter controller, phase/frequency decision device, programmable logic controller (PLC);Number mirror The output of frequency phase discriminator is connected with phase/frequency decision device, phase/frequency decision device respectively with loop filter and programmable patrol It collects controller to be connected, loop filter is connected with digital vco, and the output of voltage-controlled vibrator is connected with frequency divider, frequency dividing All the way input signal of the output of device as digital frequency phase detector;The digital programmable logic controller and loop are joined simultaneously Number controller is connected, and loop parameter controller is connected with loop filter.
2. frequency synthesizer according to claim 1, it is characterised in that: the digital frequency phase detector is to input with reference to letter Number and frequency divider output carry out frequency and phase comparison, then obtain one and represent the signal of phase/frequency error to phase Position/frequency decision device;Phase/frequency decision device is adjudicated according to error signal into property, and the court verdict of phase and frequency is obtained, and It is sent respectively to loop filter and programmable logic controller (PLC);Programmable logic controller (PLC) is according to phase/frequency decision device Court verdict, carries out the parameter adjustment of loop filter, and the result of adjustment is sent to loop parameter controller, loop parameter Controller controls loop filter according to result.
3. frequency synthesizer according to claim 2, it is characterised in that: be provided with tunable electricity in the loop filter Resistance, the loop parameter controller adjust the performance of loop filter by adjusting the tunable resistance in loop filter.
4. frequency synthesizer according to claim 1, it is characterised in that: the digital frequency phase detector includes that clock divides in advance Frequency module, multi-bit counter module, multi-bit register module, Edge check module, while the pre- frequency division module of clock is received and is fixed The clock signal of crystal oscillator clock input, then exports reference clock signal by even number, odd number, half-integer cascaded divider, so Reference clock signal is exported to Edge check module and multi-bit counter module afterwards, Edge check receives feedback clock signal, Then the edge for detecting reference clock signal and feedback clock signal, obtains the phase/frequency according to the edge situation of the two The signal of error.
5. frequency synthesizer according to claim 1, it is characterised in that: have in the circuit of the phase/frequency decision device Body includes four nor gates and two D flip-flops.
6. frequency synthesizer according to claim 5, it is characterised in that: the phase/frequency decision device includes two and patrols Circuit is collected, described two logic circuits include two OR-NOT circuits, and wherein nor gate a input terminal receives digital frequency discrimination The positive negative error signal of phase discriminator output, another input terminal receive a judgement clock and are used to determine that phase/frequency is adjudicated The judgement period;Input terminal of the output end of the logic circuit as D flip-flop, another input of D flip-flop End connection judgement clock signal, D flip-flop export low and high level to obtain the signal after tracing compensation.
7. frequency synthesizer according to claim 1, it is characterised in that: the programmable logic controller (PLC) can be west gate The AC500 of sub- S7-200 or mitsubishi FX2N or ABB.
8. frequency synthesizer according to claim 1, it is characterised in that: the frequency synthesizer can be applied to airborne thunder It reaches, trailer-mounted radar, aircraft radar and satellite radar.
9. frequency synthesizer according to claim 1, it is characterised in that: the digital frequency divider can be even frequency division Device, odd divider, decimal frequency divider.
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