CN113315513A - Ultra-wideband frequency synthesis circuit - Google Patents
Ultra-wideband frequency synthesis circuit Download PDFInfo
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- CN113315513A CN113315513A CN202110447819.2A CN202110447819A CN113315513A CN 113315513 A CN113315513 A CN 113315513A CN 202110447819 A CN202110447819 A CN 202110447819A CN 113315513 A CN113315513 A CN 113315513A
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- 230000015572 biosynthetic process Effects 0.000 title claims abstract description 24
- 238000003786 synthesis reaction Methods 0.000 title claims abstract description 24
- 230000002194 synthesizing effect Effects 0.000 claims description 6
- 238000001228 spectrum Methods 0.000 abstract description 2
- 230000009286 beneficial effect Effects 0.000 description 2
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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
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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
- H03L7/08—Details of the phase-locked loop
- H03L7/099—Details of the phase-locked loop concerning mainly the controlled oscillator of the loop
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Abstract
The invention discloses an ultra-wideband frequency synthesis circuit, which comprises a phase discriminator, a loop filter, an oscillator and a programmable frequency divider, wherein the output end of the phase discriminator is sequentially connected with the loop filter and the oscillator, the output end of the oscillator is connected to the input end of the programmable screen divider, the output end of the programmable frequency divider is differential output, the differential output of the programmable frequency divider is divided into two paths of signals, one path of signal is directly output outwards, and the other signal is fed back to the radio frequency input end of the phase discriminator to form a closed loop. The ultra-wideband frequency synthesis circuit provided by the invention has the characteristics of ultra-wide output frequency range, high spectrum purity, better output power flatness, extremely simple circuit structure, low cost, miniaturization and the like.
Description
Technical Field
The invention belongs to the technical field of frequency synthesis, and particularly relates to an ultra-wideband frequency synthesis circuit.
Background
Frequency synthesizers are used to synthesize various types of signals and play an important role in electronic systems, where ultra-wideband frequency synthesizers are more desirable.
Existing ultra-wideband frequency synthesizers are typically implemented using the scheme of fig. 1. The scheme comprises a Phase Detector (PD), a loop filter (LPF), an oscillator (VCO), a shunt, an amplifier, a frequency divider and a frequency spreading circuit at an output end, and 7 parts of circuits. The output signal of the oscillator is output through a shunt, one path of the output signal is fed back to an amplifier for amplification, the amplified signal is subjected to pre-frequency division, then the frequency-divided signal is fed back to the radio-frequency input end of a phase discriminator, the phase discriminator performs phase discrimination on the input reference signal and the frequency-divided signal to output error voltage, and the voltage passes through a loop filter to control the output frequency of the oscillator so that the oscillator outputs corresponding frequency according to requirements. The amplifier in the feedback branch performs the functions of power compensation and frequency division stray isolation.
In the development trend of the comprehensive integration of electronic systems, devices with the same weight need to be integrated with more functions to adapt to more application scenes, and a frequency synthesizer is required to have an ultra-wide frequency range and smaller volume weight, so that an ultra-wideband frequency synthesis circuit beneficial to miniaturization is urgently needed.
Disclosure of Invention
The invention aims to: aiming at the defects in the prior art, the ultra-wideband frequency synthesis circuit with the ultra-wideband output frequency range, high frequency spectrum purity, good output power flatness and extremely simple circuit structure is provided.
The purpose of the invention is realized by the following technical scheme:
an ultra-wideband frequency synthesis circuit comprises a phase discriminator, a loop filter, an oscillator and a programmable frequency divider, wherein the output end of the phase discriminator is sequentially connected with the loop filter and the oscillator, the output end of the oscillator is connected to the input end of the programmable frequency divider, the output end of the programmable frequency divider is in differential output, the differential output of the programmable frequency divider is divided into two paths of signals, one path of signal is directly output outwards, and the other signal is fed back to the radio frequency input end of the phase discriminator to form a closed loop; when the loop is locked, the output frequency and all configurable parameters of the ultra-wideband frequency synthesis circuit meet the following requirements:
FOUT＝FVCO/D
FOUT＝FCOMP×N；
wherein, FOUTFor synthesizing the signal frequency, F, for the output frequencyVCOFor the oscillator output signal frequency, FCOMPAnd D is the frequency division ratio of the programmable frequency divider, and N is the internal frequency division ratio of the phase discriminator.
Alternatively, the oscillator preferably uses an oscillator that spans an octave, such as an oscillator having an output frequency covering 4-8 GHz or 10-20 GHz.
Alternatively, the programmable frequency divider is preferably a programmable frequency divider with a frequency dividing function of 1/2/4/8, and the operating frequency band thereof covers the output frequency band of the oscillator.
Alternatively, the phase detector preferably includes a device in which the radio frequency input frequency band can cover the oscillator output frequency band, so as to exert the oscillator broadband performance.
The main scheme and the further selection schemes can be freely combined to form a plurality of schemes which are all adopted and claimed by the invention; in the invention, the selection (each non-conflict selection) and other selections can be freely combined. After understanding the technical solutions of the present invention, those skilled in the art can understand that there are many combinations according to the prior art and the common general knowledge, which are all the technical solutions to be protected by the present invention, and are not exhaustive here.
The invention has the beneficial effects that:
1. it is possible to have an ultra wide output frequency range. For example, when an oscillator with an output frequency band covering 10-20 GHz and a configurable frequency divider with 1/2/4/8 frequency division function are adopted, the ultra-wideband output of 1.25GHz (10GHz/8) to 20GHz (20GHz/1) can be realized.
2. High spectral purity. Two ports of a differential output end of the frequency divider are adopted to carry out signal output and feedback respectively, so that the frequency of a feedback signal is equal to that of an output signal, and frequency division stray does not exist. The problem that the frequency division stray isolation is carried out by using an amplifier in the traditional frequency synthesis circuit but the effect is limited is solved radically.
3. The output power flatness is better. The characteristic of better flatness of the output power of the frequency divider is fully utilized, and the power flatness of the output signal of the broadband oscillator is improved.
4. The circuit structure is extremely simple, and low cost and miniaturization are facilitated. The 7 circuit function parts of the traditional broadband frequency synthesis circuit are simplified to 4, and the circuit complexity is greatly reduced. The circuit devices are greatly reduced, and favorable conditions are created for low cost and miniaturization.
Drawings
Fig. 1 is a schematic diagram of a conventional wideband frequency synthesizer.
Fig. 2 is a schematic structural view of embodiment 1 of the present invention.
Detailed Description
The following non-limiting examples serve to illustrate the invention.
Example 1:
referring to fig. 2, the present embodiment provides an ultra-wideband frequency synthesis circuit, which includes four functional circuits, namely, a phase detector, a loop filter, an oscillator, and a programmable frequency divider.
The output end of the phase discriminator is sequentially connected with the loop filter and the oscillator, the output signal of the oscillator is connected to the input end of the programmable screen divider, the output end of the programmable frequency divider is in differential output, the differential output of the programmable frequency divider is divided into two paths of signals, one path of signals is directly output outwards, and the other signal is fed back to the radio frequency input end of the phase discriminator to form a closed loop.
When the loop of the frequency synthesis circuit is locked, the output frequency of the circuit and each configurable parameter meet the constraint formed by the formula 1 and the formula 2.
FOUT＝FVCOD; (formula 1)
FOUT＝FCOMPX is N; (formula 2)
Wherein, FOUTFor synthesizing the signal frequency, F, for the output frequencyVCOFor the oscillator output signal frequency, FCOMPFor phase detection frequency, D is the programmable divider division ratio, and N is the phase detector internal division ratio (which may be an integer or a decimal).
Preferably, in the present embodiment, the oscillator preferably uses an oscillator spanning an octave, such as an oscillator with an output covering 4-8 GHz or 10-20 GHz.
Preferably, in this embodiment, the programmable frequency divider preferably has a frequency dividing function of 1/2/4/8, and its operating frequency band covers the output frequency band of the oscillator. By adopting the oscillator with the output frequency band covering 10-20 GHz and the configurable frequency divider with 1/2/4/8 frequency division function, the ultra-wideband output of 1.25GHz (10GHz/8) to 20GHz (20GHz/1) can be realized.
Preferably, in this embodiment, the phase detector preferably is a device whose rf input frequency band can cover the oscillator output frequency band, so as to exert the oscillator broadband performance.
The ultra-wideband frequency synthesis circuit provided by the embodiment has the following working procedures:
1. a frequency synthesis circuit is built according to the circuit structure of the figure 2.
2. And reasonable low-pass filter design is carried out to ensure that the synthesis circuit can be locked in the full frequency band.
3. A reference signal is supplied as a frequency reference.
4. The programmable divider division ratio "D" is configured.
5. And configuring a frequency division ratio N of the phase discriminator.
6. And after the loop of the frequency synthesis circuit is locked, the frequency synthesis signal output with the frequency of FOUT meeting the constraints of formula 1 and formula 2 is realized.
Based on the frequency design of the ultra-wideband frequency synthesis circuit described in the embodiment, a domestic phase discriminator chip covering 20GHz, a 10-20 GHz broadband oscillator and an 1/2/4/8 programmable frequency divider are adopted, so that the ultra-small 1.25-20 GHz ultra-wideband frequency synthesis circuit is realized.
The above example proves that the ultra-wideband frequency synthesis circuit provided by the embodiment is realizable.
The foregoing basic embodiments of the invention and their various further alternatives can be freely combined to form multiple embodiments, all of which are contemplated and claimed herein. In the scheme of the invention, each selection example can be combined with any other base example and selection example at will. For example, fig. … … can also be regarded as a combination of the basic example and the option … …, fig. … … can also be regarded as a combination of the basic example and the option … …, and so on, which are not exhaustive, and those skilled in the art can recognize many combinations.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (4)
1. The utility model provides an ultra wide band frequency synthesis circuit, includes phase discriminator, loop filter and oscillator, the output of phase discriminator is connected with loop filter, oscillator in proper order, its characterized in that: the output end of the oscillator is connected to the input end of the programmable frequency divider, the output end of the programmable frequency divider is differential output, the differential output of the programmable frequency divider is divided into two paths of signals, one path of signal is directly output outwards, and the other path of signal is fed back to the radio frequency input end of the phase discriminator to form a closed loop; when the ultra-wideband frequency synthesis circuit is locked by a loop, the output frequency and all configurable parameters of the circuit meet the following requirements:
FOUT＝FVCO/D
FOUT＝FCOMP×N；
wherein, FOUTFor synthesizing the signal frequency, F, for the output frequencyVCOFor the oscillator output signal frequency, FCOMPTo phase discriminate the frequency, D isAnd programming the frequency dividing ratio of the frequency divider, wherein N is the internal frequency dividing ratio of the phase discriminator.
2. An ultra-wideband frequency synthesizing circuit as claimed in claim 1 wherein: the oscillator is an octave-crossing oscillator, and the output frequency of the oscillator covers 4-8 GHz or 10-20 GHz.
3. An ultra-wideband frequency synthesizing circuit as claimed in claim 1 wherein: the programmable frequency divider has 1/2/4/8 frequency dividing function and its working frequency range covers the output frequency range of the oscillator.
4. An ultra-wideband frequency synthesizing circuit as claimed in claim 1 wherein: and the radio frequency input section of the phase discriminator covers the output frequency band of the oscillator.
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| CN202110447819.2A CN113315513A (en) | 2021-04-25 | 2021-04-25 | Ultra-wideband frequency synthesis circuit |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102545892A (en) * | 2012-01-18 | 2012-07-04 | 上海华力微电子有限公司 | Circuit of broadband phase-locked loop frequency synthesizer |
| CN102868395A (en) * | 2012-10-11 | 2013-01-09 | 广州润芯信息技术有限公司 | Phase-locked loop frequency synthesizer and open loop frequency coarse tuning method |
| CN105577178A (en) * | 2015-12-11 | 2016-05-11 | 中国航空工业集团公司西安航空计算技术研究所 | Broadband low-phase noise Sigma-Delta phase-locked loop |
| CN107968652A (en) * | 2017-12-29 | 2018-04-27 | 陕西烽火电子股份有限公司 | A kind of low phase noise shortwave frequency hopping frequency synthesizer |
| CN110719099A (en) * | 2019-11-19 | 2020-01-21 | 中国电子科技集团公司第二十九研究所 | Synthesizer-based in-loop mixing type phase-locked loop |
-
2021
- 2021-04-25 CN CN202110447819.2A patent/CN113315513A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102545892A (en) * | 2012-01-18 | 2012-07-04 | 上海华力微电子有限公司 | Circuit of broadband phase-locked loop frequency synthesizer |
| CN102868395A (en) * | 2012-10-11 | 2013-01-09 | 广州润芯信息技术有限公司 | Phase-locked loop frequency synthesizer and open loop frequency coarse tuning method |
| CN105577178A (en) * | 2015-12-11 | 2016-05-11 | 中国航空工业集团公司西安航空计算技术研究所 | Broadband low-phase noise Sigma-Delta phase-locked loop |
| CN107968652A (en) * | 2017-12-29 | 2018-04-27 | 陕西烽火电子股份有限公司 | A kind of low phase noise shortwave frequency hopping frequency synthesizer |
| CN110719099A (en) * | 2019-11-19 | 2020-01-21 | 中国电子科技集团公司第二十九研究所 | Synthesizer-based in-loop mixing type phase-locked loop |
Non-Patent Citations (1)
| Title |
|---|
| 曹瑞 等: "基于PLL的Ku波段频率源设计与测试", 《电子制作》 * |
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