CN208445546U - A kind of broadband low phase noise frequency synthesizer based on optical-electronic oscillator - Google Patents
A kind of broadband low phase noise frequency synthesizer based on optical-electronic oscillator Download PDFInfo
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Abstract
The utility model discloses a kind of broadband low phase noise frequency synthesizer based on optical-electronic oscillator, the signal of reference circuit output is divided into two-way by the first power splitter, wherein, the first via is sequentially connected the first frequency divider, first switch filtering unit, the first frequency mixer and first filter；Second tunnel is connect with Fractional-N frequency device, and Fractional-N frequency device is connected by the reference signal input terminal of N switch filtering component and phase discriminator；The output end of first filter and the RF signal input end of phase discriminator connect, the charge pump output of phase discriminator connects the second power splitter by switch loop filter components, voltage controlled oscillation and divides the signal into two-way, it is connect all the way with the first frequency mixer, output signal of the another way as frequency synthesizer；N-1 frequency dividing interpolation phase locking unit being sequentially connected is equipped between the first power splitter and Fractional-N frequency device；The utility model can greatly improve the index of mutually making an uproar of output signal, or even break through the attainable theoretical limit of legacy frequencies synthesis mode.
Description
Technical field
The utility model relates to a kind of broadband low phase noise frequency synthesizer based on optical-electronic oscillator, belongs to frequency synthesizer
Technical field.
Background technique
Microwave Frequency Synthesizer be widely used in instrument and meter, remote-control romote-sensing communication, radar, electronic countermeasure, navigation and
The army and the people's purposes every field such as radio and television, is known as electronic system " heart ", directly affects the performance parameter of electronic system.With
The continuous promotion of electronic system performance, the requirement to the index especially phase noise of frequency synthesizer is higher and higher, even
The bottleneck promoted as system performance.For example, the phase noise of radar system frequency synthesizer restricts radar system to low
It is empty, at a slow speed, small-sized, Stealthy Target detectivity.
The phase noise of traditional frequency combining method, final output signal can be calculated with engineering empirical equation
(reference source background noise+20lgN+3), such as with best high-precision crystal oscillator at present, phase noise specifications are-
165dBc/Hz offset carrier 10kHz, being calculated in its phase noise of 10GHz carrier signal is -122dBc/Hz.Only change
Traditional frequency synthesis mode is possible to break through this theoretical boundary.
Utility model content
Technical problem to be solved by the utility model is: providing a kind of broadband Low phase noise frequency conjunction based on optical-electronic oscillator
It grows up to be a useful person, generates the quasi- frequency of high frequency of Low phase noise using the theory of Microwave photonics using optical-electronic oscillator as the core of reference circuit
Rate recycles the frequency synthesis technique of electronics, in such a way that multistage interpolation locking phase carries out phase demodulation, in the same of spread bandwidth
When, the background phase noise of reduction device as far as possible mutually makes an uproar to output signal the influence of index, to break through Conventional frequency synthesizers phase
The theoretical limit of position noise, solves the problems, such as that its narrow bandwidth, phase noise are big.
The technical solution of the utility model is: a kind of broadband low phase noise frequency synthesizer based on optical-electronic oscillator, including
The signal of reference circuit, the reference circuit output is divided into two-way by the first power splitter, wherein
The first via is connect with the input terminal of the first frequency divider, output end and the first switch filtering unit of the first frequency divider
Input terminal connection, the output end of first switch filtering unit are connect with the radio-frequency head of the first frequency mixer, the intermediate frequency of the first frequency mixer
End is connect with the input terminal of first filter；
Second tunnel is connect with the input terminal of Fractional-N frequency device, and the output end of Fractional-N frequency device is defeated with N switch filtering component
Enter end connection, the output end of N switch filtering component and the reference signal input terminal of phase discriminator connect；
The output end of first filter and the RF signal input end of phase discriminator connect, and the charge pump output of phase discriminator passes through
The voltage tuning end of voltage controlled oscillator is connected to after switch loop filter components, the radiofrequency signal of voltage controlled oscillator output passes through
Second power splitter is divided into two-way, connect all the way with the local oscillator end of the first frequency mixer, output of the another way as frequency synthesizer
Signal；
First filter and phase discriminator between the first power splitter in the first via and Fractional-N frequency device and on the second tunnel
Between be equipped with N-1 frequency dividing interpolation phase locking unit being sequentially connected, N >=2.
The frequency dividing interpolation phase locking unit includes frequency divider, frequency mixer and filter and switch filtering component, wherein frequency dividing
The output end of device is connect with the input terminal of switch filtering component, and the radio-frequency head of the output end of switch filtering component and frequency mixer connects
It connects, the intermediate frequency end of frequency mixer and the input terminal of filter connect；The input terminal of frequency divider in the frequency dividing interpolation phase locking unit
For being connect with the output end of the frequency divider in the first power splitter or upper frequency dividing interpolation phase locking unit, the output end of frequency divider
It is described for being connect with next input terminal of frequency divider divided in interpolation phase locking unit or the input terminal of n-th frequency divider
Divide interpolation phase locking unit in frequency mixer local oscillator end be used for in first filter or upper frequency dividing interpolation phase locking unit
Filter output end connection, the output end of filter is used for and the sheet of the frequency mixer in next frequency dividing interpolation phase locking unit
The connection of the RF signal input end of vibration end or phase discriminator.
The reference circuit includes optical-electronic oscillator, and output signal is divided into two-way by power splitter a, wherein all the way with it is mixed
The local oscillator end of frequency device connects, and the input terminal of another way and frequency divider connects, and the output end of frequency divider and the reference input of DDS connect
It connects, the output end of DDS and the reference signal input terminal of phase discriminator connect, and the charge pump output of phase discriminator passes through after loop filter
Be connected to the voltage tuning end of voltage controlled oscillator, the signal of voltage controlled oscillator output is divided into two-way by power splitter b, all the way with
The radio-frequency head of frequency mixer connects, output signal of the another way as reference circuit, the intermediate frequency end of frequency mixer and low-pass filter
The RF signal input end of output end and phase discriminator that input terminal connects low-pass filter connects.
The frequency of the optical-electronic oscillator is 10GHz.
The beneficial effects of the utility model are: the approach that the utility model is combined by Microwave photonics with electronics,
Using the theory of Microwave photonics, tool is generated by the method with DDS progress interpolation locking phase using optical-electronic oscillator as benchmark
There is the reference signal of certain bandwidth, recycle the frequency synthesis technique of electronics, which is repeatedly divided, uses
The technology of multistage interpolation locking phase, the fundamental signal or n times harmonic signal of each frequency divider output of selection appropriate carry out operation, are expanding
While opening up bandwidth of operation, influence of the reduction device background noise to signal phase noise as far as possible.The utility model changes biography
The mode for being extended frequency from low past height by modes such as frequency multiplication, mixing of system, passes through frequency dividing for the reference signal of high frequency, is mixed
Mode by frequency from height toward low extension, can greatly improve the index of mutually making an uproar of output signal, or even break through legacy frequencies and close
At the attainable theoretical limit of mode.By using multistage interpolation Phase Lock Technique, the frequency band of output signal is greatly extended
Width realizes the frequency synthesis of broadband Low phase noise.
Detailed description of the invention
Fig. 1 is the schematic diagram of frequency synthesizer；
Fig. 2 is the schematic diagram of reference circuit.
Specific embodiment
Utility model is described further below with reference to specific embodiment:
Referring to Fig. 1, according to a kind of broadband low phase noise frequency synthesizer based on optical-electronic oscillator of the utility model, including
The signal of reference circuit, reference circuit output is divided into two-way by the first power splitter, wherein
The first via is connect with the input terminal of the first frequency divider, output end and the first switch filtering unit of the first frequency divider
Input terminal connection, the output end of first switch filtering unit are connect with the radio-frequency head of the first frequency mixer, the intermediate frequency of the first frequency mixer
End is connect with the input terminal of first filter；
Second tunnel is connect with the input terminal of Fractional-N frequency device, and the output end of Fractional-N frequency device is defeated with N switch filtering component
Enter end connection, the output end of N switch filtering component and the reference signal input terminal of phase discriminator connect；
The output end of first filter and the RF signal input end of phase discriminator connect, and the charge pump output of phase discriminator passes through
The voltage tuning end of voltage controlled oscillator is connected to after switch loop filter components, the radiofrequency signal of voltage controlled oscillator output passes through
Second power splitter is divided into two-way, connect all the way with the local oscillator end of the first frequency mixer, output of the another way as frequency synthesizer
Signal；
First filter and phase discriminator between the first power splitter in the first via and Fractional-N frequency device and on the second tunnel
Between be equipped with N-1 frequency dividing interpolation phase locking unit being sequentially connected, N >=2.
Preferably, each frequency dividing interpolation phase locking unit includes frequency divider, frequency mixer and filter and switch filtering component,
In, the output end of frequency divider is connect with the input terminal of switch filtering component, and the output end of switch filtering component and frequency mixer
Radio-frequency head connection, the intermediate frequency end of frequency mixer and the input terminal of filter connect.Frequency divider in each frequency dividing interpolation phase locking unit
Input terminal be used to connect with the output end of frequency divider in the first power splitter or upper frequency dividing interpolation phase locking unit, frequency divider
Output end be used for it is next frequency dividing interpolation phase locking unit in frequency divider input terminal or n-th frequency divider input terminal connect
It connecing, i.e., the input terminal of the frequency divider of first frequency dividing interpolation phase locking unit is connect with the output end of the first power splitter, and subsequent point
The input terminal of the frequency divider of frequency interpolation phase locking unit and the output end of the frequency divider in upper one frequency dividing interpolation phase locking unit connect, and
The output end of the frequency divider of the last one frequency dividing interpolation phase locking unit is connect with the input terminal of n-th frequency divider；In the frequency dividing
The local oscillator end of frequency mixer in mortise lock phase element is used for and the filtering in first filter or upper frequency dividing interpolation phase locking unit
The output end of device connects, the output end of filter be used for the local oscillator end of the frequency mixer in next frequency dividing interpolation phase locking unit or
The RF signal input end of phase discriminator connects, i.e., the local oscillator end of the frequency mixer of first frequency dividing interpolation phase locking unit and the first filtering
The output end of device connects, and the local oscillator end of the frequency mixer of subsequent frequency dividing interpolation phase locking unit and upper frequency dividing interpolation phase locking unit
In the output end of filter connect, and the output end of the filter of the last one frequency dividing interpolation phase locking unit is then penetrated with phase discriminator
The connection of frequency signal input part.
With reference to Fig. 2, it is preferable that reference circuit includes optical-electronic oscillator, and output signal is divided into two-way by power splitter a,
It is wherein connect all the way with the local oscillator end of frequency mixer, the connection of the input terminal of another way and frequency divider, the output end of frequency divider and DDS's
Reference input connection, the output end of DDS and the reference signal input terminal of phase discriminator connect, and the charge pump output of phase discriminator passes through
The voltage tuning end of voltage controlled oscillator is connected to after loop filter, the signal of voltage controlled oscillator output is divided by power splitter b
Two-way is connect with the radio-frequency head of frequency mixer all the way, output signal of the another way as reference circuit, the intermediate frequency end of frequency mixer with
The output end of input terminal connection low-pass filter and the RF signal input end of phase discriminator of low-pass filter connect.Preferably,
The frequency of optical-electronic oscillator is 10GHz, and phase with higher makes an uproar index can after the signal and DDS that it is exported carry out interpolation locking phase
To obtain the Low phase noise reference signal with certain bandwidth.
In one example, phase discriminator model HMC3716, voltage controlled oscillator model MAOC- that reference circuit is selected
009265, DDS model AD9910.The phase discriminator model ADF4002 selected in frequency synthesizer circuit, voltage controlled oscillation type
Number be MAOC-410100.The models such as frequency mixer, filter are selected according to frequency range.
The signal of reference circuit output extends output bandwidth repeatedly dividing, by way of multistage interpolation locking phase.Each point
The fundamental signal and n times harmonic signal that the switch filter group of frequency device output end connection can export frequency divider select, and lead to
Fundamental frequency, the n times harmonic frequency of reasonable selection frequency divider output are crossed, the signal that each frequency divider is exported carries out operation,
The frequency coverage of wider bandwidth may be implemented.In one example, 4 N have three-level to divide interpolation phase locking unit,
The frequency dividing interpolation phase locking unit of other quantity can be selected as needed.
Frequency synthesis mode based on optical-electronic oscillator, combines Microwave photonics and theory of electronics, changes tradition
Low frequency signal is passed through frequency multiplication, is mixed the method extended to high frequency by frequency synthesis, and the higher photoelectricity of phase noise specifications is utilized to shake
Device is swung as benchmark, high-frequency signal is extended by dividing, being mixed to low frequency, according to engineering experience formula reference source background noise
+ 20lgN+3, N value is less than 1(it should be understood that the N and N in the utility model frequency synthesizer is not same herein when frequency dividing
It is a), phase noise specifications are only influenced by the background noise of all kinds of devices at this time, can break through the theory of legacy frequencies synthesis mode
The limit.
It, cannot the above content is specific preferred embodiment further detailed description of the utility model is combined
Assert that the specific implementation of the utility model is only limited to these instructions.For the ordinary skill of the utility model technical field
For personnel, without departing from the concept of the premise utility, a number of simple deductions or replacements can also be made, should all regard
To belong to the protection scope of the utility model.
Claims (4)
1. a kind of broadband low phase noise frequency synthesizer based on optical-electronic oscillator, including reference circuit, it is characterised in that: the ginseng
The signal for examining circuit output is divided into two-way by the first power splitter, wherein
The first via is connect with the input terminal of the first frequency divider, the input of the output end and first switch filtering unit of the first frequency divider
End connection, the output end of first switch filtering unit connect with the radio-frequency head of the first frequency mixer, the intermediate frequency end of the first frequency mixer and
The input terminal of first filter connects；
Second tunnel is connect with the input terminal of Fractional-N frequency device, the output end of Fractional-N frequency device and the input terminal of N switch filtering component
Connection, the output end of N switch filtering component and the reference signal input terminal of phase discriminator connect；
The output end of first filter and the RF signal input end of phase discriminator connect, and the charge pump output of phase discriminator passes through switch
The voltage tuning end of voltage controlled oscillator is connected to after loop filter components, the radiofrequency signal of voltage controlled oscillator output passes through second
Power splitter is divided into two-way, connect all the way with the local oscillator end of the first frequency mixer, output signal of the another way as frequency synthesizer；
It is set between the first power splitter in the first via and Fractional-N frequency device and between the first filter on the second tunnel and phase discriminator
There are N-1 frequency dividing interpolation phase locking unit being sequentially connected, N >=2.
2. the broadband low phase noise frequency synthesizer according to claim 1 based on optical-electronic oscillator, it is characterised in that: described
Divide interpolation phase locking unit include frequency divider, frequency mixer and filter and switch filtering component, wherein the output end of frequency divider with
The input terminal of switch filtering component connects, and the radio-frequency head of the output end of switch filtering component and frequency mixer connects, frequency mixer
The connection of the input terminal of intermediate frequency end and filter；The input terminal of frequency divider in the frequency dividing interpolation phase locking unit is used for and the first function
The output end connection of point device or the frequency divider in upper frequency dividing interpolation phase locking unit, the output end of frequency divider be used for it is next
Divide the input terminal connection of the input terminal or n-th frequency divider of the frequency divider in interpolation phase locking unit, the frequency dividing interpolation locking phase
The local oscillator end of frequency mixer in unit is used for defeated with the filter in first filter or upper frequency dividing interpolation phase locking unit
Outlet connection, the output end of filter are used for and the local oscillator end of the frequency mixer in next frequency dividing interpolation phase locking unit or phase discriminator
RF signal input end connection.
3. the broadband low phase noise frequency synthesizer according to claim 1 based on optical-electronic oscillator, it is characterised in that: described
Reference circuit includes optical-electronic oscillator, and output signal is divided into two-way by power splitter a, wherein all the way with the local oscillator end of frequency mixer
The input terminal of connection, another way and frequency divider connects, and the output end of frequency divider and the reference input of DDS connect, the output of DDS
End is connect with the reference signal input terminal of phase discriminator, and the charge pump output of phase discriminator is by being connected to voltage-controlled vibration after loop filter
Swing the voltage tuning end of device, the signal of voltage controlled oscillator output is divided into two-way by power splitter b, all the way with the radio frequency of frequency mixer
End connection, output signal of the another way as reference circuit, the intermediate frequency end of frequency mixer and the input terminal connection of low-pass filter are low
The output end of bandpass filter and the RF signal input end of phase discriminator connect.
4. the broadband low phase noise frequency synthesizer according to claim 3 based on optical-electronic oscillator, it is characterised in that: described
The frequency of optical-electronic oscillator is 10GHz.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111953340A (en) * | 2019-05-15 | 2020-11-17 | 博通集成电路（上海）股份有限公司 | Frequency synthesizer and method of operating the same |
| CN112688641A (en) * | 2020-12-16 | 2021-04-20 | 中电科仪器仪表有限公司 | Device and method for realizing quadrature frequency mixing based on frequency divider |
-
2018
- 2018-10-19 CN CN201821701063.XU patent/CN208445546U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111953340A (en) * | 2019-05-15 | 2020-11-17 | 博通集成电路（上海）股份有限公司 | Frequency synthesizer and method of operating the same |
| CN111953340B (en) * | 2019-05-15 | 2024-02-09 | 博通集成电路（上海）股份有限公司 | Frequency synthesizer and method of operation thereof |
| CN112688641A (en) * | 2020-12-16 | 2021-04-20 | 中电科仪器仪表有限公司 | Device and method for realizing quadrature frequency mixing based on frequency divider |
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