CN106788419A - A kind of high performance adjustable wide band radio-frequency oscilator system - Google Patents
A kind of high performance adjustable wide band radio-frequency oscilator system Download PDFInfo
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- CN106788419A CN106788419A CN201611075033.8A CN201611075033A CN106788419A CN 106788419 A CN106788419 A CN 106788419A CN 201611075033 A CN201611075033 A CN 201611075033A CN 106788419 A CN106788419 A CN 106788419A
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- 239000013078 crystal Substances 0.000 claims abstract description 55
- 230000000295 complement effect Effects 0.000 claims abstract description 23
- 230000010355 oscillation Effects 0.000 description 7
- 238000001914 filtration Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 230000003068 static effect Effects 0.000 description 2
- 238000012935 Averaging Methods 0.000 description 1
- 230000033228 biological regulation Effects 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 230000008030 elimination Effects 0.000 description 1
- 238000003379 elimination reaction Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
Classifications
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- 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
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03L—AUTOMATIC CONTROL, STARTING, SYNCHRONISATION OR STABILISATION OF GENERATORS OF ELECTRONIC OSCILLATIONS OR PULSES
- H03L2207/00—Indexing scheme relating to automatic control of frequency or phase and to synchronisation
- H03L2207/12—Indirect frequency synthesis using a mixer in the phase-locked loop
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- Stabilization Of Oscillater, Synchronisation, Frequency Synthesizers (AREA)
Abstract
The invention belongs to radio circuit technical field, it is specifically related to a kind of high performance adjustable wide band radio-frequency oscilator system, it is characterized in that mainly including the four crystal negative-feedback complementary oscillators, the second frequency mixer, four-divider, phase discriminator, loop filter, voltage controlled oscillator and the digital frequency divider that are sequentially connected, the digital frequency divider connects phase discriminator and frequency dividing control device respectively；The four crystal negative-feedback complementary oscillator is made up of the branch road of constant-current source and two parallel connections, and mirror-image constant flow source, shunt circuit, the crystal oscillating circuit of two parallel connections and the first frequency mixer that each branch route is sequentially connected are constituted.The present invention can not only realize that output frequency is dynamically adjustable, but also the characteristics of have high frequency stability, low phase noise simultaneously, it has very strong practicality.
Description
Technical field
The invention belongs to radio circuit technical field, a kind of high performance adjustable wide band radio-frequency oscillator system is specifically related to
System.
Background technology
Radio-frequency oscillator system on the market, can substantially be divided into following two major class at present.
One class is the radio-frequency oscillator system of fixed frequency, and this class oscilator system has that frequency stability is high, phase
The relatively low advantage of noise, but defect is the carrier wave that can only produce fixed frequency, it is impossible to meet in modern communicationses to carrier system frequently
The adjustable requirement of rate, for example, cannot meet the carrier wave requirement of broadband scanning system.
Another kind of is the radio-frequency oscillator system of frequency-adjustable, and it can produce dynamic adjustable in the bandwidth range of regulation
Radio-frequency carrier；But this class radio-frequency oscillator generally uses frequency doubling technology, and reference frequency is risen into radio-frequency carrier frequency range.Cause
This, the absolute frequency amount of deflection of this class oscillator is exaggerated N times, with the rising for penetrating carrier frequency, the frequency of oscillator
Rate deviation can be increasing, phase noise also can more and more higher, so as to have a strong impact on the performance of oscillator.
Therefore, how to develop one kind can realize output frequency it is dynamically adjustable, while having high frequency stability, low phase
The radio-frequency oscillator system of position noise objective, is a problem of current those skilled in the art's needs solution.
The content of the invention
The present invention is in view of the shortcomings of the prior art, there is provided a kind of high performance adjustable wide band radio-frequency oscilator system；This is
System can not only realize that output frequency is dynamically adjustable, but also the characteristics of there is high frequency stability, low phase noise simultaneously.
In order to achieve the above object, a kind of high performance adjustable wide band radio-frequency oscilator system of the invention, it is main include according to
Four crystal negative-feedback complementary oscillators of secondary connection, the second frequency mixer, four-divider, phase discriminator, loop filter, VCO
Device and digital frequency divider, the digital frequency divider connect phase discriminator and frequency dividing control device respectively；The four crystal negative-feedback is complementary
Oscillator is made up of the branch road of constant-current source and two parallel connections, mirror-image constant flow source, shunt circuit, two that each branch route is sequentially connected
Individual crystal oscillating circuit in parallel and the first frequency mixer are constituted.
Preferably, it is provided with the first bandpass filter between first frequency mixer and the second frequency mixer.
Preferably, it is provided with the second bandpass filter between second frequency mixer and four-divider.
Preferably, the 3rd wave filter is provided between the four-divider and phase discriminator.
The four crystal negative-feedback complementary oscillator is made up of the branch road of constant-current source and two parallel connections, and each branch route successively
The mirror-image constant flow source of connection, shunt circuit, the crystal oscillating circuit and the first frequency mixer of two parallel connections are constituted.Described two parallel connections
Crystal oscillating circuit constitutes a bicrystal complementation oscillating circuit for highlights correlations, and the branch current sum of two crystal oscillating circuits is equal to mirror image
Standard static electric current produced by constant-current source circuit.
Second frequency mixer, is mainly used in being mixed two branch output signals of four crystal negative-feedback complementary oscillators
Frequently, sum of fundamental frequencies signal and numerous fourier series mixed frequency signals will be produced after mixing.
The four-divider, Main Function is that sum of fundamental frequencies signal is reduced to reference signal.
First bandpass filter, the second bandpass filter and the 3rd bandpass filter, its effect is to filter others
Frequency component, to obtain pure frequency.
The phase discriminator is mainly used in differentiating the phase difference of reference frequency signal and voltage controlled oscillator divided signal, from
And both differential signals are obtained, as next step treatment.
The loop filter is mainly used in filtering the radio-frequency component in the mixed signal of phase discriminator output, only retains direct current
Signal, and voltage controlled oscillator is provided it to, as the vibrational control voltage of VCO.
Voltage controlled oscillator (VCO) is the signal output source of system, and it is the controlled oscillation source of an output frequency, with loop
The DC voltage that wave filter is obtained produces frequency of oscillation as control signal, exports radio-frequency carrier.
The digital frequency divider is the variable frequency dividers of a divide ratio N, and Main Function is by voltage controlled oscillator
High frequency output signal is reduced to low frequency, is then input into phase discriminator, is allowed to carry out phase demodulation with reference signal.
The frequency dividing control device mainly for generation of digital frequency divider divide ratio N.
The present invention can not only realize that output frequency is dynamically adjustable, but also have high frequency stability, low phase position simultaneously
The characteristics of noise, it has very strong practicality.
Brief description of the drawings
Fig. 1 is the overall structure diagram of the system；
Fig. 2 is the structural representation of four crystal negative-feedback complementary oscillators.
Wherein, 1 is four crystal negative-feedback complementary oscillators, and 11 is mirror-image constant flow source, and 121,122 is crystal oscillating circuit, and 13 are
Shunt circuit, 14 is constant-current source, and 21 is the first frequency mixer, and 22 is the second frequency mixer, and 31 is the first bandpass filter, and 32 is second
Bandpass filter, 33 is the 3rd bandpass filter, and 4 is four-divider, and 5 is phase discriminator, and 6 is loop filter, and 7 is VCO
Device, 8 is digital frequency divider, and 9 is frequency dividing control device.
Specific embodiment
With reference to embodiment and accompanying drawing, the present invention is described in further detail, but embodiments of the present invention are not limited
In this.
A kind of reference picture 1, high performance adjustable wide band radio-frequency oscilator system of the embodiment of the present invention is main to include connecting successively
The four crystal negative-feedback complementary oscillators 1 that connect, the second frequency mixer 22, four-divider 4, phase discriminator 5, loop filter 6, voltage-controlled shake
Device 7 and digital frequency divider 8 are swung, the digital frequency divider 8 connects phase discriminator 5 and frequency dividing control device 9 respectively；Four crystal is negative anti-
Feedback complementary oscillator 1 be made up of the branch road of constant-current source 14 and two parallel connections, each branch route be sequentially connected mirror-image constant flow source 11,
13, two crystal oscillating circuits 121 of parallel connection of shunt circuit, the frequency mixer 21 of crystal oscillating circuit 122 and first are constituted.
Be provided with the first bandpass filter 31 between the frequency mixer 22 of first frequency mixer 21 and second, the second frequency mixer 22 with
The second bandpass filter 32 is provided between four-divider 4.The 3rd wave filter 33 is provided between the four-divider 4 and phase discriminator 5.
The four crystal negative-feedback complementary oscillator 1 is made up of the branch road of constant-current source 14 and two parallel connections, each branch route
The mirror-image constant flow source 11 that is sequentially connected, 13, two crystal oscillating circuits 121 of parallel connection of shunt circuit, crystal oscillating circuit 122 and first are mixed
Frequency device 21 is constituted.It is complementary that described two crystal oscillating circuits 121 in parallel and crystal oscillating circuit 122 constitute a bicrystal for highlights correlations
The branch current sum of oscillating circuit, crystal oscillating circuit 121 and crystal oscillating circuit 122 is equal to the mark produced by mirror-image constant flow source circuit 11
Quasistatic electric current.Because standard static electric current is invariable, when the electric current of crystal oscillating circuit 121 increases, the electric current of crystal oscillating circuit 122
Then reduce；Conversely, when the electric current of crystal oscillating circuit 121 reduces, the electric current of crystal oscillating circuit 122 then increases.
Because quiescent current is the extraneous factor of influence crystal oscillator performance, it is assumed that under the influence of certain external interference, crystal oscillator
The electric current increase of circuit 121, so as to the frequency of oscillation for causing the circuit crystal oscillator increases, then at the same time, crystal oscillating circuit 122
The quiescent current amplitude such as be bound to reduces, so as to cause the frequency of oscillation of crystal oscillator of crystal oscillating circuit 122 to decline, and because crystal oscillator electricity
Road 121 and crystal oscillating circuit 122 are full symmetric, so the frequency that the crystal oscillator of crystal oscillating circuit 122 reduces just is equal to crystal oscillating circuit 121
The increased frequency of crystal oscillator, it is achieved thereby that two output frequency complete complementaries of crystal oscillator, that is to say, that two outputs of crystal oscillator
The numerical value of sum of fundamental frequencies signal keeps constant, so as to substantially increase the stability of double crystal oscillator output frequencies.Four crystal negative-feedbacks are complementary
Each branch road of oscillator 1 can be described as a bicrystal complementary oscillator；Because bicrystal complementary oscillator realizes output
Frequency deviation signal is repealed by implication, therefore greatly improved the quality and performance of output signal, for whole system provides height
The derived reference signal of stabilization.
The oscillator signal of bicrystal complementary oscillator output can obtain shaking for 2 overtones bands after the first frequency mixer 21
Swing signal 2f0, that is, crystal oscillating circuit 121 and crystal oscillating circuit 122 crystal oscillator frequency sum of fundamental frequencies signal, then this signal is by first
The filtering clutter of bandpass filter 31, has just obtained frequency for 2f0High stable output signal.
The principle of another branch road of the four crystal negative-feedback complementary oscillator 1 and the complete phase of the principle of branch road described in epimere
Together.According to " average value elimination error " principle, if by the output signal of the circuit of this two-way bicrystal complementary oscillator again
Sum of fundamental frequencies is carried out, frequency will be obtained for 4f0Sum of fundamental frequencies signal, if by 4f0Sum of fundamental frequencies signal carry out being averaging calculating, will obtain frequency
Rate is f0Average value signal.Because have passed through average treatment, average value signal f0Error will be further reduced, believe
Number quality will further improve.After tested, compared with common crystals circuit, the frequency stability of four crystal complementary oscillators
More than 5 times are improve, the phase noise of 10KHz frequency deviations reduces 9dB or so.
Second frequency mixer 22, is mainly used in entering two branch output signals of four crystal negative-feedback complementary oscillators 1
Row mixing, sum of fundamental frequencies signal and numerous fourier series mixed frequency signals will be produced after mixing.
The four-divider 4, Main Function is that sum of fundamental frequencies signal is reduced to reference signal f0。
First bandpass filter 31, the second bandpass filter 32 and the 3rd bandpass filter 33, its effect is to filter
Other frequency components, to obtain pure frequency.
The phase discriminator 5 is mainly used in differentiating the phase difference of reference frequency signal and the divided signal of voltage controlled oscillator 7,
So as to obtain both differential signals, as next step treatment.
The loop filter 6 is mainly used in filtering the radio-frequency component in the mixed signal of phase discriminator output, only retains straight
Stream signal, and voltage controlled oscillator 7 is provided it to, as the vibrational control voltage of VCO.
Voltage controlled oscillator (VCO) is the signal output source of system, and it is the controlled oscillation source of an output frequency, with loop
The DC voltage that wave filter is obtained produces frequency of oscillation as control signal, exports radio-frequency carrier.
The digital frequency divider 8 is the variable frequency dividers of a divide ratio N, and Main Function is by voltage controlled oscillator 7
High frequency output signal be reduced to low frequency, then be input into phase discriminator 5, be allowed to carry out phase demodulation with reference signal.
The frequency dividing control device 9 mainly for generation of digital frequency divider divide ratio N.Understand by analysis：Phase discriminator
5th, digital frequency divider 8, loop filter 6, voltage controlled oscillator 7, this four devices have been collectively constituted one " high frequency frequency multiplier ", this
It is the reference frequency signal f for exporting the 3rd bandpass filter 33 in matter0N times of frequency multiplication is carried out, f=N*f is obtained0The higher-order of oscillation
Device output signal, so as to the radio-frequency carrier for realizing high band is exported.The number of divide ratio N can be changed due to frequency dividing control device 9
Value, it is achieved that the dynamic of output frequency f is adjustable.Digital program controlled frequency divider chip, divide ratio N is used to can reach at present
More than 2048, therefore can realize that the dynamic frequency in broadband range is adjustable.
The radio-frequency oscillator of the present embodiment realizes performance very high, compared with similar oscillator, frequency stability
Improve more than 5 times, phase noise reduction 9db or so (at 10KHz frequency deviations).Additionally, the oscillator of the present embodiment design can be real
Frequency-adjustable in existing broadband range.
The present invention can not only realize that output frequency is dynamically adjustable, but also have high frequency stability, low phase position simultaneously
The characteristics of noise, it has very strong practicality.
Above-described embodiment is the present invention preferably implementation method, but embodiments of the present invention are not by above-described embodiment
Limitation, it is other it is any without departing from Spirit Essence of the invention and the change, modification, replacement made under principle, combine, simplification,
Equivalent substitute mode is should be, is included within protection scope of the present invention.
Claims (4)
1. a kind of high performance adjustable wide band radio-frequency oscilator system, it is characterised in that：Main four crystal for including being sequentially connected
Negative-feedback complementary oscillator, the second frequency mixer, four-divider, phase discriminator, loop filter, voltage controlled oscillator and digital frequency division
Device, the digital frequency divider connects phase discriminator and frequency dividing control device respectively；The four crystal negative-feedback complementary oscillator is by constant current
The branch roads of source and two parallel connections are constituted, mirror-image constant flow source that each branch route is sequentially connected, shunt circuit, the crystal oscillator of two parallel connections
Circuit and the first frequency mixer are constituted.
2. a kind of high performance adjustable wide band radio-frequency oscilator system according to claim 1, it is characterised in that：Described
The first bandpass filter is provided between one frequency mixer and the second frequency mixer.
3. a kind of high performance adjustable wide band radio-frequency oscilator system according to claim 1, it is characterised in that：Described
The second bandpass filter is provided between two frequency mixers and four-divider.
4. a kind of high performance adjustable wide band radio-frequency oscilator system according to claim 1, it is characterised in that：Described four
The 3rd wave filter is provided between frequency divider and phase discriminator.
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| CN201611075033.8A CN106788419A (en) | 2016-11-22 | 2016-11-22 | A kind of high performance adjustable wide band radio-frequency oscilator system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107342765A (en) * | 2017-08-16 | 2017-11-10 | 吉林大学 | A kind of design with flexible adjustable divider ratio function digit frequency divider |
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| US5731743A (en) * | 1996-10-07 | 1998-03-24 | David Sarnoff Research Center, Inc. | Frequency synthesizer having phase error feedback for waveform selection |
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| CN204633753U (en) * | 2015-01-23 | 2015-09-09 | 安徽白鹭电子科技有限公司 | Based on HMC835 broadband Low phase noise low spurious frequency hopping synthesizer |
| CN105827206A (en) * | 2016-03-16 | 2016-08-03 | 成都信息工程大学 | Phase shift complementation-type oscillator |
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2016
- 2016-11-22 CN CN201611075033.8A patent/CN106788419A/en active Pending
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3902141A (en) * | 1973-06-20 | 1975-08-26 | Golay Bernard Sa | Quartz oscillator having very low power consumption |
| US5731743A (en) * | 1996-10-07 | 1998-03-24 | David Sarnoff Research Center, Inc. | Frequency synthesizer having phase error feedback for waveform selection |
| CN2376142Y (en) * | 1999-01-04 | 2000-04-26 | 向明 | Capacitance-resistance network voltage controlled sine-wave oscillator |
| CN1734948A (en) * | 2004-08-04 | 2006-02-15 | 松下电器产业株式会社 | Frequency mixer device and method for compensating DC offset |
| CN101542896A (en) * | 2007-06-20 | 2009-09-23 | 香港应用科技研究有限公司 | Frequency mixer |
| US20140118077A1 (en) * | 2010-08-24 | 2014-05-01 | Marvell World Trade Ltd. | Inverter cell for a ring oscillator |
| CN102347728A (en) * | 2011-09-06 | 2012-02-08 | 无锡海威半导体科技有限公司 | Oscillator with high power supply rejection ratio and low temperature wave |
| CN103248319A (en) * | 2012-04-25 | 2013-08-14 | 嘉兴联星微电子有限公司 | Low-power consumption oscillating circuit |
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| CN107342765A (en) * | 2017-08-16 | 2017-11-10 | 吉林大学 | A kind of design with flexible adjustable divider ratio function digit frequency divider |
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