CN209659272U - A kind of low noise frequency synthesizer that resonance is isolated - Google Patents
A kind of low noise frequency synthesizer that resonance is isolated Download PDFInfo
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- CN209659272U CN209659272U CN201920742048.8U CN201920742048U CN209659272U CN 209659272 U CN209659272 U CN 209659272U CN 201920742048 U CN201920742048 U CN 201920742048U CN 209659272 U CN209659272 U CN 209659272U
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Abstract
The utility model discloses a kind of low noise frequency synthesizers that resonance is isolated, including loop filtering module and voltage controlled oscillation module.Voltage controlled oscillation module includes automatic biasing Dolby circuit and isolation resonance circuit；Isolation resonance circuit input terminal is connect with loop filtering module, resonance circuit output end is isolated and frequency division module, automatic biasing Dolby circuit and output connect, resonance circuit is isolated and generates oscillator signal, be controlled by loop filtering module voltage control signal frequency modulation and output is isolated；Automatic biasing Dolby circuit input terminal for reducing flicker noise and inhibits flicker noise frequency conversion conversion with resonance circuit connection, automatic biasing Dolby circuit output end ground connection is isolated.The utility model keeps apart resonant tank and dynatron and output when applying, and can obtain higher frequency of oscillation, and can reduce the frequency conversion conversion of flicker noise and flicker noise, while improving vibration temperature stability.
Description
Technical field
The utility model relates to frequency synthesizer field, the low noise frequency synthesizer of specifically a kind of isolation resonance.
Background technique
Frequency synthesizer is the important component of contemporary electronic systems, in communication, radar, navigation, electronic countermeasure and survey
It is all widely used in examination equipment, especially in electronic countermeasure in terms of radio communication electric warfare.Frequency synthesizer is
The Primary Component for determining performance in wireless communication systems, provides oscillator signal by voltage controlled oscillator unit for radio transceiver machine
And frequency modulation(PFM), phase noise are the important indicators for measuring oscillator signal quality.
Flicker noise is one of device self-noise in circuit, and flicker noise is transmitting caused by device barrier potential is uneven
The slow random fluctuation of electronics, this variation typically occur in lower frequency, and flicker noise will affect phase noise performance.Frequently
The voltage controlled oscillator unit of rate synthesizer is typically provided tail current source and negative resistance module, and tail current source is for providing second harmonic high resistant
It is anti-, reduce power consumption.Negative resistance module is used to provide energy to resonant cavity and output loading, compensates the positive resistance energy damage of resonant process
Consumption, to guarantee oscillatory stability.Some researches show that, the flicker noise and negative resistance module of tail current source is added to tail current source
Flicker noise, they upconvert to phase noise together, influence the phase noise performance of frequency synthesizer voltage controlled oscillator unit.
Flicker noise reduces with device size and is increased, and contemporary electronic systems tend to send out to highly integrated and small size direction
Exhibition, also just requirement of the meaning to size of electronic devices is higher and higher for this, therefore the influence that flicker noise generates in frequency synthesizer
Increasingly highlight.In addition, in the case of a high temperature, negative resistance module negative resistance absolute value can reduce, the energy for causing it to provide is reduced, vibration
Stability reduction is swung, failure of oscillation phenomenon is easy to appear.
Utility model content
Utility model aims to solve the above problems of the prior art, provide a kind of low noise that resonance is isolated
Resonant tank and dynatron and output are kept apart when applying, can obtain higher frequency of oscillation by frequency synthesizer, and
And it can reduce the frequency conversion conversion of flicker noise and flicker noise, while improving vibration temperature stability.
The purpose of this utility model is achieved through the following technical solutions:
A kind of low noise frequency synthesizer that resonance is isolated, including phase demodulation module, loop filtering module, voltage controlled oscillation mould
Block, frequency division module, power supply module and main control module, the voltage controlled oscillation module include automatic biasing Dolby circuit and isolation resonance electricity
Road；The isolation resonance circuit input terminal is connect with loop filtering module, isolation resonance circuit output end and frequency division module, self-bias
Dolby circuit and output connection are set, isolation resonance circuit generates oscillator signal, is controlled by loop filtering module voltage control signal
Simultaneously output is isolated in frequency modulation；The automatic biasing Dolby circuit input terminal is exported with resonance circuit connection, automatic biasing Dolby circuit is isolated
End ground connection for reducing flicker noise and inhibits flicker noise frequency conversion conversion.
Preferably, the isolation resonance circuit includes inductance L1, variable condenser C1 and C2, capacitor C3 and C4, resistance R1
And R2, metal-oxide-semiconductor Q3 and Q4；The one end variable condenser C1 is used as input terminal, variable capacitance after connecting with the one end variable condenser C2
Device C1 other end connection one end resistance R1 is followed by the one end capacitor C3, and variable condenser C2 other end connection one end resistance R2 is followed by electricity
Hold the one end C4, the resistance R1 other end and the resistance R2 other end are grounded, and capacitor C3 mono- terminates the one end inductance L1 and metal-oxide-semiconductor Q3 base
Pole, another termination inductance L1 other end of capacitor C4 and metal-oxide-semiconductor Q4 base stage, added with direct current signal, metal-oxide-semiconductor Q3 collector on inductance L1
Operating voltage is connect with metal-oxide-semiconductor Q4 collector, metal-oxide-semiconductor Q3 emitter and metal-oxide-semiconductor Q4 emitter are respectively as output end.
Preferably, the automatic biasing Dolby circuit includes metal-oxide-semiconductor Q1 and Q2, Q5 and Q6, capacitor C5 to C9, resistance R3 and
R4；Metal-oxide-semiconductor Q1 drain electrode is used as input termination metal-oxide-semiconductor Q3 emitter, metal-oxide-semiconductor Q1 grid and metal-oxide-semiconductor after connecting with metal-oxide-semiconductor Q2 grid
As input termination metal-oxide-semiconductor Q4 emitter after Q2 drain electrode connection, metal-oxide-semiconductor Q1 source electrode connects the one end capacitor C5 and metal-oxide-semiconductor Q5 drain electrode,
Metal-oxide-semiconductor Q2 source electrode connects the capacitor C5 other end and metal-oxide-semiconductor Q6 drain electrode, and metal-oxide-semiconductor Q5 source electrode and metal-oxide-semiconductor Q6 source electrode are respectively as output end
Ground connection, metal-oxide-semiconductor Q5 grid connect the one end capacitor C6 and are followed by the one end capacitor C7 and the one end resistance R3, and metal-oxide-semiconductor Q6 grid meets capacitor C8 mono-
End is followed by the one end capacitor C9 and the one end resistance R4, and the capacitor C6 other end and the capacitor C8 other end meet periodic signal, capacitor C7 respectively
The other end and the capacitor C9 other end are grounded, and the resistance R3 other end connect with the resistance R4 other end and is followed by offset signal.
Preferably, the isolation resonance circuit output end is connected by buffer circuit and frequency division module and output, for mentioning
High vibration temperature stability.
In conclusion the utility model has the following beneficial effects:
1, by metal-oxide-semiconductor Q3 and Q4, inductance L1, variable condenser C1 and C2, the LC resonance of capacitor C3 and C4 composition is electric
Road is isolated with peripheral circuit, so that LC resonance circuit has lesser equivalent capacity, to obtain higher frequency of oscillation.
2, in the equal access cycle signal of metal-oxide-semiconductor Q5 and Q6 base stage and adjustable offset signal, so that metal-oxide-semiconductor Q5 and the Q6 period
Property conducting shutdown, reduce tail current source metal-oxide-semiconductor Q5 and Q6 flicker noise, phase noise improvement is good, at the same capacitor C5 hinder
Disconnected negative resistance metal-oxide-semiconductor Q1 and Q2 flicker noise are by adding to tail current source metal-oxide-semiconductor Q5 and Q6, to inhibit negative resistance metal-oxide-semiconductor Q1 and Q2
Flicker noise participates in up-conversion conversion, further increases phase noise performance.
3, buffer circuit is connected between isolation resonance circuit output end and frequency division module and output, increases and decays with temperature
Amount increases, and return loss increases, so that in the case of a high temperature, the energy for being reflected back isolation resonance circuit increases, that is, maintains oscillation
Energy increase, vibration temperature stability is improved.
Detailed description of the invention
Attached drawing described herein is used to provide to further understand the utility model embodiment, constitutes the one of the application
Part does not constitute the restriction to the utility model embodiment.In the accompanying drawings:
Fig. 1 is the isolation resonance circuit figure of one specific embodiment of the utility model.
Fig. 2 is the automatic biasing Dolby circuit figure of one specific embodiment of the utility model.
Fig. 3 is the functional block diagram of frequency synthesizer.
Fig. 4 is the buffer circuit figure of one specific embodiment of the utility model.
Specific embodiment
Multiple embodiments that the utility model will be disclosed with schema below, as clearly stated, in many practices
Details will be explained in the following description.It should be appreciated, however, that the details in these practices does not apply this with limitation practical new
Type.That is, the details in these practices is non-essential in some embodiments of the utility model.In addition, for letter
For the sake of changing schema, some known usual structures and component will be painted it in the drawings in simply illustrative mode.
It should be noted that unless otherwise clearly defined and limited, term " setting ", " installation ", " connected ", " connection "
It shall be understood in a broad sense, for example, it may be being fixedly connected, may be a detachable connection, or be integrally connected；It can be mechanical connect
It connects, is also possible to be electrically connected；It can be directly connected, can also can be in two elements indirectly connected through an intermediary
The connection in portion.For the ordinary skill in the art, above-mentioned term can be understood in the present invention with concrete condition
Concrete meaning.
Embodiment:
A kind of low noise frequency synthesizer that resonance is isolated, including phase demodulation module, loop filtering module, voltage controlled oscillation mould
Block, frequency division module and power supply module.As shown in figure 3, the connection reference signal input of phase demodulation module input and voltage controlled oscillation module,
Phase demodulation module output end linkloop filter module is converted into voltage for the phase difference of comparison reference signal and oscillator signal
Signal output.Loop filtering module input connects phase demodulation module, and loop filtering module output end connects voltage controlled oscillation module, uses
In filtering out useless combination frequency component and interference in voltage signal, generates one and only reflect that the voltage of phase difference size controls letter
Number.Voltage controlled oscillation module input linkloop filter module, voltage controlled oscillation module output end connection output and frequency division module, are used
It is exported in generation oscillator signal and according to voltage control signal frequency modulation.Frequency division module input terminal voltage controlled oscillation module, frequency division module
Output end connects phase demodulation module, for voltage controlled oscillation module outputting oscillation signal frequency to be carried out different scaling down processings.Power supply
Module is connect with phase demodulation module, loop filtering module, voltage controlled oscillation module and frequency division module respectively, for providing corresponding work
Voltage.Existing common phase discriminator, existing common loop filtering is respectively adopted in phase demodulation module, loop filtering module and frequency division module
Circuit and existing common frequency dividing circuit realize that power supply module uses power supply and common voltage translation circuit, optionally, phase demodulation module
Model MSPD1013-121, loop filtering module model EMF035A23A, frequency division module model CD4060BE, mould of powering
Block model ZXD030 S480.
Voltage controlled oscillation module includes automatic biasing Dolby circuit and isolation resonance circuit；Resonance circuit input terminal and loop is isolated
Filter module connection, isolation resonance circuit output end and frequency division module, automatic biasing Dolby circuit and output connect, isolation resonance electricity
Road generates oscillator signal and is controlled by loop filtering module voltage control signal, and simultaneously output is isolated to frequency division module, self-bias in frequency modulation
Set Dolby circuit and output.
Specifically, as shown in Figure 1, isolation resonance circuit includes inductance L1, variable condenser C1 and C2, capacitor C3 and C4,
Resistance R1 and R2, metal-oxide-semiconductor Q3 and Q4；The one end variable condenser C1 is used as input terminal after connecting with the one end variable condenser C2, can
Variodenser C1 other end connection one end resistance R1 is followed by the one end capacitor C3, and the variable condenser C2 other end connects the one end resistance R2
It is followed by the one end capacitor C4, the resistance R1 other end and the resistance R2 other end are grounded, and capacitor C3 mono- terminates the one end inductance L1 and metal-oxide-semiconductor
Q3 base stage, another termination inductance L1 other end of capacitor C4 and metal-oxide-semiconductor Q4 base stage, added with direct current signal, metal-oxide-semiconductor Q3 collection on inductance L1
Electrode and metal-oxide-semiconductor Q4 collector connect operating voltage, and metal-oxide-semiconductor Q3 emitter and metal-oxide-semiconductor Q4 emitter are respectively as output end.Work
Make voltage, direct current signal is provided by power supply module.
Capacitor C3 and C4 and inductance L1 generates oscillation, loop filtering module output voltage control signal to isolation resonance electricity
Road carries out resonance frequency modulation by variable condenser C1 and C2, and oscillator signal adds to metal-oxide-semiconductor Q3 base stage and metal-oxide-semiconductor Q4 base after frequency modulation
Pole, metal-oxide-semiconductor Q3 and Q4 emitter export again.Since the size of frequency of oscillation has with inductance and with the equivalent capacity of inductance in parallel
It closes, and negatively correlated, LC resonance circuit is isolated by metal-oxide-semiconductor Q3 and Q4 with peripheral circuit, equivalent capacity and variable capacitance
Device C1 and C2, capacitor C3 is related to C4, and unrelated with the capacitor of peripheral circuit, and equivalent capacity is smaller, to obtain higher vibration
Swing frequency.
Further, two output ends that resonance circuit is isolated connect frequency division module and output by buffer circuit respectively,
Buffer circuit is for improving vibration temperature stability.As shown in figure 4, buffer circuit includes capacitor C10 and C11, metal-oxide-semiconductor Q7, electricity
Hinder R5 to R8, inductance L2.Isolation resonance circuit output end is sequentially connected connecting resistance R7 mono- after capacitor C11, inductance L2 and resistance R6
End and the one end resistance R8, resistance R7 other end ground connection, another termination capacitor C10 of resistance R8 are followed by metal-oxide-semiconductor Q7 base stage, metal-oxide-semiconductor Q7
Collector connects voltage signal, and the one end metal-oxide-semiconductor Q7 emitter connecting resistance R5 is followed by exporting, resistance R5 other end ground connection.
Capacitor C10, metal-oxide-semiconductor Q7 and resistance R5 play the role of buffer amplifier, improve isolation resonance circuit and output
Impedance matching, resistance R6 to R8 constitute attenuator, vary with temperature the increase of its attenuation, and circuit return loss increases, and negative resistance mentions
The energy of confession, which is reflected back isolation resonance circuit, to be increased, i.e., for maintaining the energy of oscillation to increase, vibration temperature stability is obtained
It improves.
Automatic biasing Dolby circuit input terminal is connected with resonance circuit is isolated, automatic biasing Dolby circuit output ground connection, for dropping
Low flash noise and inhibition flicker noise frequency conversion.Specifically, as shown in Fig. 2, automatic biasing Dolby circuit include metal-oxide-semiconductor Q1 and Q2,
Q5 and Q6, capacitor C5 to C9, resistance R3 and R4；Metal-oxide-semiconductor Q1 drain electrode terminates after connecting with metal-oxide-semiconductor Q2 grid as an input
Termination metal-oxide-semiconductor Q4 emitter is inputted as another after metal-oxide-semiconductor Q3 emitter, metal-oxide-semiconductor Q1 grid and metal-oxide-semiconductor Q2 drain electrode connection,
Metal-oxide-semiconductor Q1 source electrode connects the one end capacitor C5 and metal-oxide-semiconductor Q5 drain electrode, and metal-oxide-semiconductor Q2 source electrode connects the capacitor C5 other end and metal-oxide-semiconductor Q6 drain electrode,
Metal-oxide-semiconductor Q5 source electrode and metal-oxide-semiconductor Q6 source electrode are used as output end to be grounded, and metal-oxide-semiconductor Q5 grid connects the one end capacitor C6 and is followed by capacitor C7 mono-
End and the one end resistance R3, metal-oxide-semiconductor Q6 grid connect the one end capacitor C8 and are followed by the one end capacitor C9 and the one end resistance R4, the capacitor C6 other end
Connect periodic signal respectively with the capacitor C8 other end, the capacitor C7 other end and the capacitor C9 other end are grounded, the resistance R3 other end with
The connection of the resistance R4 other end is followed by offset signal.Offset signal is provided by power supply module, and periodic signal is mentioned by buffer circuit output
For.
Metal-oxide-semiconductor Q1 and Q2 provide negative resistance, and metal-oxide-semiconductor Q5 and Q6 provide tail current biasing, and are provided by power supply module adjustable
Offset signal match circuit.Capacitor C6 and C8 provide alternating current path, for periodic signal, that is, buffer circuit output frequency signal, coupling
The grid of metal-oxide-semiconductor Q5 and Q6 is closed, with frequency periodicity turn-on and turn-off metal-oxide-semiconductor Q5 and Q6, to reduce metal-oxide-semiconductor Q5 and Q6
Time constant, to reduce the flicker noise of metal-oxide-semiconductor Q5 and Q6, phase noise improvement is good.While capacitor C7 and resistance R3,
Capacitor C9 and resistance R4 constitutes filter, the noise of offset signal is filtered out, to reduce tail current source noise to the shadow of phase noise
It rings.Capacitor C5 be able to suppress metal-oxide-semiconductor Q1 and Q2 flicker noise frequency conversion conversion, periodic signal V1 and V2 mono- for high one be it is low,
When metal-oxide-semiconductor Q1 and Q6 are connected, metal-oxide-semiconductor Q2 and Q5 shutdown, conversely, when metal-oxide-semiconductor Q2 and Q5 are connected, metal-oxide-semiconductor Q1 and Q6 shutdown, electric current
Metal-oxide-semiconductor Q6/Q5 is flowed into from metal-oxide-semiconductor Q1/Q2 through capacitor C5, and capacitor C5 is in high-impedance state to low frequency signal, therefore metal-oxide-semiconductor Q1 and Q2
Low-frequency flicker noise, so that its frequency conversion be inhibited to convert, cannot further improve phase noise by adding to metal-oxide-semiconductor Q5 and Q6
Performance.
It takes or uses for reference prior art and can be realized in the part that do not addressed in aforesaid way.
The above content is the further descriptions made in conjunction with specific preferred embodiment to the utility model, cannot recognize
Determine specific embodiment of the present utility model to be only limited to these instructions.For the common skill of the utility model technical field
For art personnel, the other embodiments obtained in the case where not departing from the technical solution of the utility model be should be included in practical
In novel protection scope.
Claims (4)
1. a kind of low noise frequency synthesizer that resonance is isolated, including phase demodulation module, loop filtering module, voltage controlled oscillation module,
Frequency division module, power supply module and main control module, it is characterised in that: the voltage controlled oscillation module include automatic biasing Dolby circuit and every
From resonance circuit；The isolation resonance circuit input terminal is connect with loop filtering module, isolation resonance circuit output end and frequency dividing
Module, automatic biasing Dolby circuit and output connection, isolation resonance circuit generate oscillator signal, are controlled by loop filtering module voltage
Simultaneously output is isolated in control signal frequency modulation；The automatic biasing Dolby circuit input terminal is connected with resonance circuit is isolated, automatic biasing noise reduction
Circuit output end ground connection for reducing flicker noise and inhibits flicker noise frequency conversion conversion.
2. a kind of low noise frequency synthesizer that resonance is isolated according to claim 1, it is characterised in that: the isolation is humorous
The circuit that shakes includes inductance L1, variable condenser C1 and C2, capacitor C3 and C4, resistance R1 and R2, metal-oxide-semiconductor Q3 and Q4；Variable capacitance
After the one end device C1 is used as input terminal, the variable condenser C1 other end to connect the one end resistance R1 after connecting with the one end variable condenser C2
The one end capacitor C3 is connect, variable condenser C2 other end connection one end resistance R2 is followed by the one end capacitor C4, the resistance R1 other end and electricity
The resistance R2 other end is grounded, and capacitor C3 mono- terminates the one end inductance L1 and metal-oxide-semiconductor Q3 base stage, another termination inductance L1 of capacitor C4 are another
End and metal-oxide-semiconductor Q4 base stage, inductance L1 is upper added with direct current signal, and it is electric that metal-oxide-semiconductor Q3 collector and metal-oxide-semiconductor Q4 collector connect work
Pressure, metal-oxide-semiconductor Q3 emitter and metal-oxide-semiconductor Q4 emitter are respectively as output end.
3. a kind of low noise frequency synthesizer that resonance is isolated according to claim 1, it is characterised in that: the automatic biasing
Dolby circuit includes metal-oxide-semiconductor Q1 and Q2, Q5 and Q6, capacitor C5 to C9, resistance R3 and R4；Metal-oxide-semiconductor Q1 drain electrode and metal-oxide-semiconductor Q2 grid
As input termination metal-oxide-semiconductor Q3 emitter after connection, metal-oxide-semiconductor Q1 grid terminates MOS as input with after metal-oxide-semiconductor Q2 drain electrode connection
Pipe Q4 emitter, metal-oxide-semiconductor Q1 source electrode connect the one end capacitor C5 and metal-oxide-semiconductor Q5 drain electrode, metal-oxide-semiconductor Q2 source electrode connect the capacitor C5 other end and
Metal-oxide-semiconductor Q6 drain electrode, metal-oxide-semiconductor Q5 source electrode and metal-oxide-semiconductor Q6 source electrode are grounded respectively as output end, and metal-oxide-semiconductor Q5 grid meets capacitor C6 mono-
End is followed by the one end capacitor C7 and the one end resistance R3, and metal-oxide-semiconductor Q6 grid connects the one end capacitor C8 and is followed by the one end capacitor C9 and resistance R4 mono-
End, the capacitor C6 other end and the capacitor C8 other end connect periodic signal respectively, and the capacitor C7 other end and the capacitor C9 other end are grounded,
The resistance R3 other end connect with the resistance R4 other end and is followed by offset signal.
4. a kind of low noise frequency synthesizer that resonance is isolated according to claim 1, it is characterised in that: the isolation is humorous
The circuit output end that shakes is connected by buffer circuit and frequency division module and output, for improving vibration temperature stability.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111478668A (en) * | 2020-04-02 | 2020-07-31 | 电子科技大学 | Millimeter wave voltage-controlled oscillator with low flicker noise |
| CN117081504A (en) * | 2023-09-01 | 2023-11-17 | 香港中文大学（深圳） | Harmonic oscillator for realizing harmonic tuning based on harmonic current selection |
-
2019
- 2019-05-22 CN CN201920742048.8U patent/CN209659272U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111478668A (en) * | 2020-04-02 | 2020-07-31 | 电子科技大学 | Millimeter wave voltage-controlled oscillator with low flicker noise |
| CN117081504A (en) * | 2023-09-01 | 2023-11-17 | 香港中文大学（深圳） | Harmonic oscillator for realizing harmonic tuning based on harmonic current selection |
| CN117081504B (en) * | 2023-09-01 | 2024-04-05 | 香港中文大学（深圳） | Harmonic oscillator for realizing harmonic tuning based on harmonic current selection |
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