CN114070308B - Broadband low-phase-noise frequency synthesis circuit - Google Patents
Broadband low-phase-noise frequency synthesis circuit Download PDFInfo
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- CN114070308B CN114070308B CN202210047034.0A CN202210047034A CN114070308B CN 114070308 B CN114070308 B CN 114070308B CN 202210047034 A CN202210047034 A CN 202210047034A CN 114070308 B CN114070308 B CN 114070308B
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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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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/69—Spread spectrum techniques
Abstract
The invention discloses a broadband low-phase-noise frequency synthesis circuit which comprises a reference unit, a local oscillator unit, an intermediate frequency unit, a spread spectrum unit and a power supply unit. The reference unit amplifies the power division reference signal, and the output end of the reference unit is connected with the input end of the intermediate frequency unit and the input end of the local oscillation unit. The intermediate frequency unit and the local oscillator unit respectively generate intermediate frequency signals and local oscillator signals, and output ends of the intermediate frequency unit and the local oscillator unit are connected with the input end of the spread spectrum unit. The intermediate frequency signal and the local oscillator signal are mixed in the frequency spreading unit, and the output of the frequency spreading unit is the output of the circuit of the invention. The power supply unit is connected with the power supply ends of the reference unit, the intermediate frequency unit, the local oscillator unit and the spread spectrum unit. The invention adopts a sampling phase-locked medium oscillator to build a low-phase-noise local oscillator frame; an independent power supply is adopted to be matched with a radio frequency switch to realize local oscillation signal power supply-radio frequency double isolation, and stray suppression is improved; and the mixing splicing is adopted to match with the variable frequency division secondary spread spectrum, and the phase noise and stray suppression of output signals are optimized. The invention effectively expands the working bandwidth and has the characteristics of low phase noise and low stray.
Description
Technical Field
The invention belongs to the technical field of frequency synthesis, and particularly relates to a broadband low-phase-noise frequency synthesis circuit.
Background
The frequency synthesis technology is widely applied to modern electronic information systems such as radars, interference and the like. Along with the technical development, each application system puts higher and more comprehensive requirements on the frequency source performance index. The broadband output can improve the frequency application range of a frequency source system; the high-purity frequency spectrum source with low phase noise and low stray can improve the system performance indexes such as sensitivity, action distance and the like.
The frequency synthesis techniques include direct digital frequency synthesis techniques, direct frequency synthesis techniques, and phase-locked loop frequency synthesis techniques.
The direct digital frequency synthesis can realize fine stepping output, but is limited by the highest clock frequency of a digital device, low output frequency and narrow bandwidth.
The direct frequency synthesis realizes the addition, subtraction, multiplication and division operations of signals by mixing, frequency multiplication and frequency division of reference input, has no additional digital device noise, but has more hardware occupation and low synthesis efficiency.
The phase-locked frequency synthesis technology is also called indirect frequency synthesis technology, adopts a phase discriminator, a voltage-controlled oscillator and the like to form a phase-locked loop, and is easy to integrate. However, the performance of the existing voltage-controlled oscillator is limited, and the general broadband application is to realize a lower-frequency baseband by using a phase-locked loop, and then spread the frequency spectrum to a required frequency band by using frequency doubling or higher-order frequency doubling. Fundamental waves and higher harmonics generated by frequency multiplication as stray signals need to be filtered by a switch filter circuit independently designed. The baseband phase noise and the stray are determined by the performance of the phase discriminator of the phase-locked loop and are difficult to promote. And the output signal is generated by the frequency multiplication of the baseband signal, and the phase noise and the spurious indexes are deteriorated according to 20lgN (N is the frequency multiplication factor) compared with the baseband signal.
The typical report is as follows:
in 2016, roming et al published a paper "a design implementation of a small millimeter wave broadband frequency source". In the scheme, a phase discriminator is matched with a broadband VCO to realize a phase-locked loop circuit of 11GHz to 20GHz, a frequency doubling spread spectrum is used for expanding to 22GHz to 40GHz, and a base band and high-order harmonic stray are filtered through switch filtering. The scheme is easy to realize and wide in coverage frequency band, but is limited by the performance of a phase discriminator, and the phase noise and the stray of a baseband are difficult to promote. And the output signal is generated by baseband frequency doubling, and the output phase noise and spurious is degraded by 6dB according to 20lgN (N = 2) compared with the phase-locked baseband.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a broadband low-phase-noise frequency synthesis circuit.
The purpose of the invention is realized by the following technical scheme: the utility model provides a broadband low phase noise frequency synthetic circuit, includes reference unit, local oscillator unit, intermediate frequency unit, spread spectrum unit and electrical unit, reference unit input low phase noise reference signal, reference unit's signal output part is connected with the signal input part of intermediate frequency unit and local oscillator unit respectively, the signal output part of intermediate frequency unit and the signal output part of local oscillator unit all are connected with spread spectrum unit's signal input part, spread spectrum unit output is the frequency synthesis output, electrical unit is connected with reference unit, local oscillator unit, intermediate frequency unit and spread spectrum unit feeder ear respectively.
Further: the reference unit comprises an amplifier and a power divider 1 which are connected, wherein the amplifier inputs a low-phase noise reference signal and amplifies the signal without additional noise, the power divider 1 is connected with the amplifier in a cascade mode and divides the reference signal into four paths, one path of reference signal is connected with the signal input end of the intermediate frequency unit, and the other three paths of reference signal are connected with the signal input end of the local oscillator unit.
Further, the method comprises the following steps: the intermediate frequency unit includes phase discriminator, loop filter, voltage controlled oscillator and merit and divides ware 2, the input and the merit of phase discriminator are divided 1 and are connected, phase discriminator, loop filter, voltage controlled oscillator and merit divide ware 2 to constitute the phase-locked loop, 2 divide the signal merit that voltage controlled oscillator produced into two the tunnel in the merit, export to the phase discriminator all the way, another way is exported to the spread spectrum unit.
Further: the local oscillator unit comprises a sampling phase-locked medium oscillator PDRO1, a sampling phase-locked medium oscillator PDRO2 and a sampling phase-locked medium oscillator PDRO3, the input ends of the sampling phase-locked medium oscillator PDRO1, the sampling phase-locked medium oscillator PDRO2 and the sampling phase-locked medium oscillator PDRO3 are all connected with the power divider 1, the sampling phase-locked medium oscillator PDRO1 generates a 20GHz local oscillator signal, the sampling phase-locked medium oscillator PDRO2 generates a 25GHz local oscillator signal, the sampling phase-locked medium oscillator PDRO3 generates a 30GHz local oscillator signal, and the outputs of the sampling phase-locked medium oscillator PDRO1, the sampling phase-locked medium oscillator PDRO2 and the sampling phase-locked medium oscillator PDRO3 are all connected to the frequency expansion unit through a switch 1.
Further: the spread spectrum unit comprises a mixer, a switch 2, a switch 3 and a band-pass filterd 1 ~d 4 The input end of the frequency mixer is respectively connected with the power divider 2 and the switch 1, and the output end of the frequency mixer is respectively connected with the band-pass filter through the switch 2d 1 ~d 4 Connected, said band-pass filterd 1 ~d 4 Are connected to a variable N-frequency divider through a switch 3, and the output end of the variable N-frequency divider is a frequency synthesizer output.
Further: the band-pass filterd 1 The pass band frequency of the filter is 20GHz to 25GHz, and the band-pass filterd 2 The passband frequency of the band-pass filter is 25GHz to 30GHzd 3 The passband frequency of the band-pass filter is 30GHz to 35GHz, and the band-pass filterd 4 The passband frequency of (2) is 35GHz to 40GHz.
Further: the variable N frequency divider is a 1/2/4/8 adjustable frequency divider.
Further, the method comprises the following steps: the power supply unit inputs an external power supplyV Input device Output reference cell supplyV Reference to Intermediate frequency unit power supplyV Intermediate frequency PDRO1 power supply for sampling phase-locked medium oscillatorV PDRO1 Sample phase-locked dielectric oscillator PDRO2 power supplyV PDRO2 And a sampling phase-locked medium oscillator PDRO3 power supplyV PDRO3 Spread spectrum unit power supplyV Spread spectrum (ii) a Synchronous power supply of power supply unitV Reference to 、V Intermediate frequency 、V Spread spectrum ，V PDRO1 、V PDRO2 、V PDRO3 Conducting according to one of three local oscillation frequency points; when the local oscillator is selected to be 20GHz,V PDRO1 the power-on state is carried out,V PDRO2 、V PDRO3 closing; when the local oscillator is 25GHz,V PDRO2 the power-on state is carried out,V PDRO1 、V PDRO3 closing; when the local oscillator is selected to be 30GHz,V PDRO3 the power-on state is carried out,V PDRO1 、V PDRO2 closing; the power supply unit is matched with the switch 1 to select one from three to gate PDRO 1-PDRO 3, so that power supply-radio frequency double isolation is realized, and high stray suppression is realized.
The aforementioned main aspects of the invention and their respective further alternatives can be freely combined to form a plurality of aspects, all of which are aspects that can be adopted and claimed by the present invention. The skilled person in the art can understand that there are many combinations, which are all the technical solutions to be protected by the present invention, according to the prior art and the common general knowledge after understanding the scheme of the present invention, and the technical solutions are not exhaustive herein.
The invention has the beneficial effects that:
the invention adopts a sampling phase-locked dielectric oscillator (PDRO) to realize the generation of a multi-point high-frequency low-phase-noise local oscillator and construct a low-phase-noise frame; an independently-cut power supply is adopted to cooperate with a radio frequency switch to gate a local oscillator signal, so that power supply-radio frequency double isolation is realized, and high stray suppression is realized; splicing to realize the baseband signal covering a single octave by optimizing a frequency mixing scheme; secondarily spreading the frequency spectrum by using a variable frequency divider, and optimizing the phase noise and spurious suppression of an output signal according to 20lgN (N is a frequency dividing ratio); and a high-frequency baseband frequency division scheme is adopted to replace a conventional low-frequency baseband frequency multiplication scheme, so that the post-stage switch filtering design is simplified, the cost is saved, and the implementation volume is reduced. The frequency synthesis realized by the invention effectively improves the working frequency, expands the working bandwidth, and has the characteristics of low phase noise, low stray and high-purity frequency spectrum.
Drawings
Fig. 1 is a schematic diagram of the circuit of the present invention.
Detailed Description
The embodiments of the present invention are described below with reference to specific embodiments, and other advantages and effects of the present invention will be easily understood by those skilled in the art from the disclosure of the present specification. The invention is capable of other and different embodiments and of being practiced or of being carried out in various ways, and its several details are capable of modification in various respects, all without departing from the spirit and scope of the present invention. It is to be noted that the features in the following embodiments and examples may be combined with each other without conflict.
It should be noted that, in order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention are clearly and completely described below, and it is obvious that the described embodiments are some embodiments of the present invention, but not all embodiments.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. indicate orientations or positional relationships that are usually placed when the product of the present invention is used, and are used only for convenience of description and simplicity of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and therefore, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," "third," and the like are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance.
Furthermore, the terms "horizontal", "vertical", "suspended" and the like do not imply that the components are absolutely horizontal or suspended, but may be slightly inclined. For example, "horizontal" merely means that the direction is more horizontal than "vertical" and does not mean that the structure must be perfectly horizontal, but may be slightly inclined.
In the description of the present invention, it should also be noted that, unless otherwise explicitly stated or limited, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in a specific case to those of ordinary skill in the art.
In addition, in the present invention, if the specific structures, connections, positions, power source relationships, etc., are not specifically written, the structures, connections, positions, power source relationships, etc., related to the present invention, can be known to those skilled in the art without creative work on the basis of the prior art.
Example 1:
referring to fig. 1, the invention discloses a broadband low-phase-noise frequency synthesis circuit, which comprises a reference unit, a local oscillator unit, an intermediate frequency unit, a spread spectrum unit and a power supply unit, wherein a low-phase-noise reference signal is input into the reference unitf ref The signal output part of the reference unit is connected with the signal input parts of the intermediate frequency unit and the local oscillator unit respectively, the signal output part of the intermediate frequency unit and the signal output part of the local oscillator unit are connected with the signal input part of the spread spectrum unit, the output end of the spread spectrum unit is frequency synthesis output, and the power supply unit is connected with the power supply ends of the reference unit, the local oscillator unit, the intermediate frequency unit and the spread spectrum unit respectively.
The reference unit output is connected intermediate frequency unit, local oscillator unit, contains: amplifier, power divider 1. The amplifier inputs a low phase noise reference signal and amplifies the signal without additive noise. Divide 1 cascade amplifier of ware to the merit, divide 4 ways with the reference signal merit, 1 way output to intermediate frequency unit phase discriminator, 3 ways output respectively to the sampling phase locking medium oscillator (PDRO 1~ PDRO 3) of local oscillator unit.
The reference unit is connected to the intermediate frequency unit input, and the spread spectrum unit is connected to the output, contains: phase discriminator, loop filter, voltage controlled oscillator, power divider 2. The phase discriminator, the loop filter, the voltage-controlled oscillator and the power divider 2 form a phase-locked loop, and the signal generated by the voltage-controlled oscillator is divided by powerThe device 2 divides power, and one path of output is output to a frequency mixer of a spread spectrum unit; one path of the signal is output to a phase discriminator, is subjected to pre-frequency division, is subjected to real-time phase comparison with a reference signal provided by a reference unit, controls a voltage-controlled oscillator, and locks and outputs an intermediate frequency signalf IF 。f IF The coverage frequency band is 5GHz to 10GHz.
The input end of the local oscillation unit is connected with the reference unit, the output end of the local oscillation unit is connected with the frequency spreading unit, and the local oscillation unit comprises a sampling phase-locked medium oscillator 1 (PDRO 1), a sampling phase-locked medium oscillator 2 (PDRO 2), a sampling phase-locked medium oscillator 3 (PDRO 3) and a switch 1. PDRO1 generates a 20GHz local oscillator signal; PDRO2 generates a 25GHz local oscillator signal; PDRO3 produces a 30GHz local oscillator signal. The output ends of PDRO1, PDRO2 and PDRO3 are connected with the switch 1. The switch 1 is matched with the power supply unit for independent power supply control, and one-out-of-three gating of local oscillation signals of 20GHz, 25GHz and 30GHz is realized by power supply-radio frequency double isolation, so that high stray suppression is realized.
The input end of the spread spectrum unit is connected with the output of the intermediate frequency unit and the output of the local oscillation unit, and the output end is the output of the frequency synthesis circuit. Comprises a mixer, a switch 2, a switch 3, a band-pass filterd 1 To band pass filterd 4 . Intermediate frequencyf IF Multiplexing, with multipoint local oscillatorsf LO Time-division mixing, generationf LO +f IF Andf LO -f IF the radio frequency output signal of (a). Six-section frequency mixing output can be realized by three-point local oscillators of 20GHz, 25GHz and 30GHz, four sections of the six-section frequency mixing output are selected to form a baseband signal covering a single frequency range, and the highest frequency of the baseband signal is the highest frequency output by the circuit. Mixing a 20GHz local oscillator with a 5GHz to 10GHz intermediate frequency, and outputting 25GHz to 30GHz in an up-conversion mode; mixing a 25GHz local oscillator with 5GHz to 10GHz intermediate frequency, and outputting 30GHz to 35GHz in an up-conversion mode; and mixing a 30GHz local oscillator with the 5GHz to 10GHz intermediate frequency, outputting the lower variable frequency from 20GHz to 25GHz, and outputting the upper variable frequency from 35GHz to 40GHz. The switch 2 and the switch 3 are single-pole four-throw switches to realize four-way gating. Four paths respectively matched with band-pass filterd 1 Band-pass filterd 4 And filtering out local oscillation stray and high-order intermodulation stray in the four-section mixing output.
Band-pass filterd 1 Passband frequency of 20GHz~25GHz；
Band-pass filterd 2 The passband frequency is 25GHz to 30GHz;
band-pass filterd 3 The passband frequency is 30GHz to 35GHz;
band-pass filterd 4 The passband frequency is 35GHz to 40GHz;
four groups of frequency bands generated by mixing are adjacent and connected with each other, and a single-frequency-range base band from 20GHz to 40GHz is realized.
The N frequency divider cascades a switch 3 and is a 1/2/4/8 adjustable frequency divider.
N =1, a base band is directly connected, 20GHz to 40GHz is output, and phase noise and stray suppression are the same as those of the base band;
n =2, the frequency division is carried out on a base band by 2, the output is 10GHz to 2GHz, and the phase noise and stray suppression are optimized by 6dB compared with the base band;
n =4, the frequency division is carried out on a baseband by 4, 5GHz to 10GHz is output, and the phase noise and stray suppression is optimized by 12dB compared with the baseband;
n =8, the baseband divides frequency by 8, outputs 2.5GHz to 5GHz, and optimizes phase noise and stray suppression by 18dB compared with the baseband;
the output of the N frequency divider is the output of the broadband low-phase noise frequency synthesis circuit. And splicing four-section signals by adjusting the frequency dividing ratio of the N frequency divider, and covering 2.5GHz to 40GHz. M produced by frequency divisionf out The signal (m is an integer, m is more than or equal to 2 and less than or equal to N) is the main signalf out Compared with the conventional low-frequency baseband frequency multiplication scheme, the high-order harmonic component does not need to be filtered separately, simplifies the post-stage switch filtering design, saves the cost, realizes the space, and optimizes the phase noise and spurious suppression indexes.
The power supply unit inputs an external power supplyV Input the method Output reference cell supplyV Reference to Intermediate frequency unit power supplyV Intermediate frequency PDRO1 power supply for sampling phase-locked medium oscillatorV PDRO1 Sample phase-locked dielectric oscillator PDRO2 power supplyV PDRO2 And a sampling phase-locked medium oscillator PDRO3 power supplyV PDRO3 Spread spectrum unit power supplyV Spread spectrum (ii) a Synchronous power supply of power supply unitV Reference to 、V Intermediate frequency 、V Spread spectrum ，V PDRO1 、V PDRO2 、V PDRO3 Conducting one by three according to the local oscillation frequency point; when the local oscillator is selected to be 20GHz,V PDRO1 the power-on state is carried out,V PDRO2 、V PDRO3 closing; when the local oscillation adopts 25GHz,V PDRO2 the power-on state is carried out,V PDRO1 、V PDRO3 closing; when the local oscillator is selected to be 30GHz,V PDRO3 the power-on state is realized,V PDRO1 、V PDRO2 closing; the power supply unit is matched with the switch 1 to select one from three to gate PDRO 1-PDRO 3, so that power supply-radio frequency double isolation is realized, and high stray suppression is realized.
The invention adopts a sampling phase-locked medium oscillator (PDRO) to generate a multi-point low-phase-noise local oscillator point frequency, and a low-phase-noise frame is built; the power supply capable of being independently turned off is matched with the radio frequency switch to realize multipoint high-frequency local oscillator power supply-radio frequency double isolation and realize high crosstalk stray inhibition; realizing a high-frequency baseband signal covering a single octave in a frequency mixing splicing mode by optimizing a frequency mixing scheme; secondarily spreading the frequency spectrum by using a variable frequency divider, and optimizing the phase noise and spurious suppression of an output signal according to 20lgN (N is a frequency dividing ratio); and a high-frequency baseband frequency division scheme is adopted to replace a conventional low-frequency baseband frequency multiplication scheme, so that the post-stage switch filtering design is reduced, the cost is saved, and the implementation volume is reduced. The multi-octave-crossing broadband low-phase-noise low-stray high-purity frequency spectrum frequency synthesis circuit is realized.
In one embodiment, the method develops the low-phase-noise low-stray high-purity spectrum source spanning four octaves from 2.5GHz to 40GHz, and better meets the application requirement.
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 (3)
1. A broadband low-phase-noise frequency synthesis circuit is characterized by comprising a reference unit, a local oscillator unit, an intermediate frequency unit, a spread spectrum unit and a power supply unit, wherein a low-phase-noise reference signal is input into the reference unit, the signal output end of the reference unit is respectively connected with the signal input ends of the intermediate frequency unit and the local oscillator unit, the signal output end of the intermediate frequency unit and the signal output end of the local oscillator unit are both connected with the signal input end of the spread spectrum unit, the output end of the spread spectrum unit is frequency synthesis output, and the power supply unit is respectively connected with the power supply ends of the reference unit, the local oscillator unit, the intermediate frequency unit and the spread spectrum unit;
the local oscillator unit comprises a sampling phase-locked medium oscillator PDRO1, a sampling phase-locked medium oscillator PDRO2 and a sampling phase-locked medium oscillator PDRO3, the input ends of the sampling phase-locked medium oscillator PDRO1, the sampling phase-locked medium oscillator PDRO2 and the sampling phase-locked medium oscillator PDRO3 are all connected with the power divider 1, the sampling phase-locked medium oscillator PDRO1 generates a 20GHz local oscillator signal, the sampling phase-locked medium oscillator PDRO2 generates a 25GHz local oscillator signal, the sampling phase-locked medium oscillator PDRO3 generates a 30GHz local oscillator signal, and the outputs of the sampling phase-locked medium oscillator PDRO1, the sampling phase-locked medium oscillator PDRO2 and the sampling phase-locked medium oscillator PDRO3 are all connected to the frequency expansion unit through a switch 1;
the power supply unit inputs an external power supply V Input device Respectively supplying power V to the reference unit, the intermediate frequency unit and the spread spectrum unit Reference to 、V Intermediate frequency 、V Spread spectrum (ii) a The power supply unit respectively and independently supplies power V to PDRO1, PDRO2 and PDRO3 in the local oscillator unit PDRO1 、V PDRO2 、V PDRO3 ；V PDRO1 、V PDRO2 、V PDRO3 According to the local oscillator frequency point, when the local oscillator selects 20GHz, V is conducted PDRO1 Conduction, V PDRO2 、V PDRO3 Closing; when the local oscillator selects 25GHz, V PDRO2 Conduction, V PDRO1 、V PDRO3 、V PDRO3 Conduction, V PDRO1 、V PDRO2 Closing; PDRO1, PDRO2 and PDRO3 adopt a power supply turn-off matching switch 1 to realize that one of three local oscillation frequency points is conducted to the spread spectrum unit;
the spread spectrum unit comprises a mixer, a switch 2, a switch 3 and a band-pass filter d 1 ～d 4 The input end of the frequency mixer is respectively connected with the power divider 2 and the switch 1, and the output end of the frequency mixer is respectively connected with the band-pass filter d through the switch 2 1 ～d 4 Connected, said band-pass filter d 1 ～d 4 Are connected to a variable N frequency divider through a switch 3, and the output end of the variable N frequency divider is frequency synthesis output;
the band-pass filter d 1 The pass band frequency of (a) is 20 GHz-25 GHz, and the band-pass filter d 2 The pass band frequency of (a) is 25 GHz-30 GHz, and the band-pass filter d 3 The pass band frequency of (a) is 30 GHz-35 GHz, and the band-pass filter d 4 The pass band frequency of the filter is 35 GHz-40 GHz; the variable N frequency divider is a 1/2/4/8 adjustable frequency divider.
2. The broadband low-phase-noise frequency synthesis circuit according to claim 1, wherein the reference unit comprises an amplifier and a power divider 1 which are connected, the amplifier inputs a low-phase-noise reference signal and amplifies the signal without adding noise, the power divider 1 cascades amplifiers to divide the reference signal into 4 paths, one path of the reference signal is connected with a signal input terminal of the intermediate frequency unit, and the remaining three paths are connected with a signal input terminal of the local oscillation unit.
3. The broadband low-phase noise frequency synthesis circuit according to claim 1, wherein the intermediate frequency unit comprises a phase detector, a loop filter, a voltage-controlled oscillator and a power divider 2, an input end of the phase detector is connected with the power divider 1, the phase detector, the loop filter, the voltage-controlled oscillator and the power divider 2 form a phase-locked loop, the power divider 2 divides a signal power generated by the voltage-controlled oscillator into two paths, one path is output to the phase detector, and the other path is output to the frequency spreading unit.
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| CN116155275B (en) * | 2023-04-19 | 2023-07-28 | 成都世源频控技术股份有限公司 | Broadband fine stepping phase-locked source with repeatable phase |
| CN116865680B (en) * | 2023-09-04 | 2023-12-05 | 中国电子科技集团公司第二十九研究所 | Small high-purity frequency spectrum broadband reconfigurable frequency synthesis circuit, device and method |
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