CN107196653B - Broadband low-phase noise frequency synthesizer - Google Patents
Broadband low-phase noise frequency synthesizer Download PDFInfo
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- CN107196653B CN107196653B CN201710251274.1A CN201710251274A CN107196653B CN 107196653 B CN107196653 B CN 107196653B CN 201710251274 A CN201710251274 A CN 201710251274A CN 107196653 B CN107196653 B CN 107196653B
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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
- H03L7/181—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 a numerical count result being used for locking the loop, the counter counting during fixed time intervals
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03L—AUTOMATIC CONTROL, STARTING, SYNCHRONISATION OR STABILISATION OF GENERATORS OF ELECTRONIC OSCILLATIONS OR PULSES
- H03L1/00—Stabilisation of generator output against variations of physical values, e.g. power supply
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Abstract
The invention discloses a broadband low-phase-noise frequency synthesis device, and particularly relates to the technical field of frequency synthesis. The broadband low-phase-noise frequency synthesizer comprises a reference circuit, a broadband signal generating circuit, a mixing circuit, a dot-frequency signal generating circuit and a decimal frequency dividing circuit which are connected with each other, the first voltage-controlled oscillator and the second voltage-controlled oscillator are combined to realize the wide frequency coverage of 6-12 GHz, the low-phase-noise dot-frequency signals of 2.5GHz, 5GHz and 10GHz generated by the dot-frequency signal generating circuit are mixed with the broadband high-frequency signals of 6-12 GHz, the broadband high-frequency signal frequency is moved downwards to 0.2-3 GHz, the phase noise deterioration caused by frequency doubling effect is reduced, the low phase noise of output signals is realized, and the high-frequency resolution of the output frequency of the frequency synthesizer is realized by using a decimal frequency dividing technology.
Description
Technical Field
The invention relates to the technical field of frequency synthesis, in particular to a broadband low-phase-noise frequency synthesis device.
Background
With the rapid development of electronic information technology, on one hand, complex signals with various high quality are generated, and on the other hand, the complex signals are accurately measured. No matter the signal is generated or analyzed, a core component of the electronic equipment, namely a frequency synthesis device, cannot be separated. The high-performance frequency synthesizer is an important part of modern electronic system equipment, is widely applied to equipment such as modern mobile communication, phased array radar, high-end electronic measuring instruments and the like, and plays a decisive role in the equipment performance of the electronic system.
Disclosure of Invention
The invention aims to realize the frequency of a broadband high-frequency signal to be shifted downwards to 0.2-3 GHz by mixing a low-phase noise point-frequency signal generated by a point-frequency signal generating circuit with the broadband high-frequency signal, and reduce the phase noise deterioration caused by frequency doubling effect.
The invention specifically adopts the following technical scheme:
a broadband low-phase noise frequency synthesizer comprises a reference circuit, a broadband signal generating circuit, a mixing circuit, a dot frequency signal generating circuit and a decimal frequency dividing circuit which are connected with each other;
the broadband signal generating circuit comprises a first voltage-controlled oscillator and a second voltage-controlled oscillator which are connected in parallel, wherein one end of the first voltage-controlled oscillator and one end of the second voltage-controlled oscillator are connected with a phase discriminator, a loop filter and a first alternative switch in series, and the other end of the first voltage-controlled oscillator and the other end of the second voltage-controlled oscillator are connected with a second alternative switch and a directional coupler in series;
the decimal frequency dividing circuit comprises a decimal frequency divider and a first two-frequency divider which are connected in series, and the decimal frequency divider is connected with the phase discriminator;
the frequency mixing circuit comprises a third alternative switch, a first frequency mixer, a fourth alternative switch and a second frequency mixer which are sequentially connected, the directional coupler is connected with the second frequency mixer, and the frequency mixing circuit is connected with the decimal frequency dividing circuit through a low-pass filter;
the dot-frequency signal generating circuit comprises a phase-locked loop circuit, a power divider is connected to the phase-locked loop circuit, a first branch and a second branch which are connected in parallel are connected to the power divider, the first branch comprises a first band-pass filter and a second frequency divider which are connected in series, the second branch comprises a fifth alternative switch, a second band-pass filter, a frequency doubler and a sixth alternative switch which are connected in series, the output end of the first branch is connected with a first frequency mixer, and the output end of the second branch is connected with a second frequency mixer.
Preferably, the signal frequency of the reference circuit is 100 MHz.
Preferably, the signal output by the phase-locked loop circuit is a 5GHz dot frequency signal, the frequency of the output signal of the second frequency divider is 2.5GHz, and the center frequency of the first band-pass filter is 2.5 GHz.
Preferably, the frequency of the output signal of the frequency doubler is 10GHz, and the center frequency of the second band-pass filter is 10 GHz.
Preferably, the output frequency range of the first voltage-controlled oscillator is 6-9 GHz, and the output frequency range of the second voltage-controlled oscillator is 9-12 GHz.
Preferably, the frequency range of the directional coupler is 6-12 GHz.
Preferably, the input frequency range of the end of the second mixer connected to the directional coupler is 6 to 12GHz, the input frequency of the end connected to the dot frequency signal generating circuit is 5GHz or 10GHz, and the output frequency range of the end connected to the fourth alternative switch is 0.2 to 5.2 GHz.
Preferably, the input frequency range of one end of the first frequency mixer connected with the fourth alternative switch is 4.8-5.2 GHz, the input frequency of one end connected with the dot frequency signal generating circuit is 2.5GHz, and the output frequency range of one end connected with the third alternative switch is 2.3-2.7 GHz.
Preferably, the input frequency range of the first two-frequency divider is 0.2 to 3GHz, and the output frequency range is 0.1 to 1.5 GHz.
Preferably, the input frequency range of the fractional frequency divider is 0.1-1.5 GHz, and the output frequency range is 0.1 GHz.
The invention has the following beneficial effects: according to the invention, the combination of a first voltage-controlled oscillator and a second voltage-controlled oscillator is utilized to realize the wide frequency coverage of 6-12 GHz; low-phase noise point frequency signals of 2.5GHz, 5GHz and 10GHz generated by a point frequency signal generating circuit are mixed with broadband high-frequency signals of 6-12 GHz, so that the frequency of the broadband high-frequency signals is shifted downwards to 0.2-3 GHz, the phase noise deterioration caused by frequency doubling effect is reduced, and the low-phase noise of output signals is realized; the decimal frequency division technology is used for realizing the high-frequency resolution of the output frequency of the frequency synthesis device; the index requirements of modern electronic system equipment on the frequency synthesis device are met.
Drawings
FIG. 1 is a schematic block diagram of a wideband low phase noise frequency synthesizer;
FIG. 2 is a schematic block diagram of a 5GHz Phase Locked Loop (PLL);
FIG. 3 is a diagram illustrating the measurement result of phase noise when the frequency synthesizer with low phase noise deviates from the carrier by 10 KHz.
The phase detector comprises a reference circuit 1, a phase discriminator 2, a loop filter 3, a first alternative switch 4, a first voltage-controlled oscillator 5, a second voltage-controlled oscillator 6, a second alternative switch 7, a directional coupler 8, a fractional frequency divider 9, a first frequency divider 10, a low-pass filter 11, a third alternative switch 12, a first frequency mixer 13, a fourth alternative switch 14, a second frequency mixer 15, a first bandpass filter 16, a fifth alternative switch 17, a second bandpass filter 18, a second frequency divider 19, a frequency doubler 20, a sixth alternative switch 21, a power divider 22 and a phase-locked loop circuit 23.
Detailed Description
The following description of the embodiments of the present invention will be made with reference to the accompanying drawings:
as shown in fig. 1-3, a wideband low-phase noise frequency synthesizer includes a reference circuit 1, a wideband signal generating circuit, a mixer circuit, a dot frequency signal generating circuit and a fractional frequency dividing circuit connected to each other;
the signal frequency of the reference circuit is 100MHz, and a reference frequency of 100MHz is provided for the frequency synthesis device.
The broadband signal generating circuit utilizes the combination of a first voltage-controlled oscillator and a second voltage-controlled oscillator to realize the frequency coverage of 6-12 GHz, and comprises a first voltage-controlled oscillator 5 and a second voltage-controlled oscillator 6 which are connected in parallel, wherein one end of the first voltage-controlled oscillator 5 and one end of the second voltage-controlled oscillator 6 are connected in series with a phase discriminator 2, a loop filter 3 and a first alternative switch 5, and the other end of the first voltage-controlled oscillator 5 and one end of the second voltage-controlled oscillator 6 are connected in series with a second alternative switch 7 and a directional coupler 8.
The decimal frequency dividing circuit realizes high frequency resolution and low phase noise of the output frequency of the frequency synthesis device by utilizing a sigma- △ decimal frequency dividing technology, and comprises a decimal frequency divider 9 and a first frequency divider 10 which are connected in series, wherein the decimal frequency divider 9 is connected with the phase discriminator 2.
The frequency mixing circuit utilizes 2.5GHz, 5GHz and 10GHz dot frequency signals to carry out frequency mixing with 6-12 GHz broadband high-frequency signals, frequency is moved downwards to 0.2-3 GHz, phase noise deterioration caused by frequency doubling effect is reduced, the frequency mixing circuit comprises a third alternative switch 12, a first frequency mixer 13, a fourth alternative switch 14 and a second frequency mixer 15 which are sequentially connected, a directional coupler 8 is connected with the second frequency mixer 15, and the frequency mixing circuit is connected with a decimal frequency dividing circuit through a low-pass filter 11.
The dot frequency signal generating circuit provides 2.5GHz, 5GHz and 10GHz low-phase noise mixing frequencies for the mixing circuit, and comprises a phase-locked loop circuit 23, wherein a power divider 22 is connected onto the phase-locked loop circuit 23, a first branch and a second branch which are connected in parallel are connected onto the power divider 22, the first branch comprises a first band-pass filter 16 and a second two-way frequency divider 19 which are connected in series, the second branch comprises a fifth two-way selector switch 17, a second band-pass filter 18, a frequency doubler 20 and a sixth two-way selector switch 21 which are connected in series, the output end of the first branch is connected with a first mixer 13, and the output end of the second branch is connected with a second mixer 15.
The output signal of the phase-locked loop circuit 23 is a 5GHz dot frequency signal, the frequency of the output signal of the second frequency divider 19 is 2.5GHz, and the center frequency of the first band-pass filter 16 is 2.5 GHz.
The frequency of the output signal of the frequency doubler 20 is 10GHz, and the center frequency of the second band-pass filter 18 is 10 GHz.
The output frequency range of the first voltage-controlled oscillator 5 is 6-9 GHz, and the output frequency range of the second voltage-controlled oscillator 6 is 9-12 GHz.
The frequency range of the directional coupler 8 is 6-12 GHz.
The input frequency range of one end of the second mixer 15 connected with the directional coupler 8 is 6-12 GHz, the input frequency of one end connected with the dot frequency signal generating circuit is 5GHz or 10GHz, and the output frequency range of one end connected with the fourth alternative switch 14 is 0.2-5.2 GHz.
The input frequency range of one end of the first frequency mixer 13 connected with the fourth alternative switch 14 is 4.8-5.2 GHz, the input frequency of one end connected with the dot frequency signal generating circuit is 2.5GHz, and the output frequency range of one end connected with the third alternative switch 12 is 2.3-2.7 GHz.
The first two-frequency divider 10 has an input frequency range of 0.2 to 3GHz and an output frequency range of 0.1 to 1.5 GHz.
The fractional frequency divider 9 has an input frequency range of 0.1 to 1.5GHz and an output frequency range of 0.1 GHz.
The working principle of the broadband low-phase noise frequency synthesis device is as follows: and the first voltage-controlled oscillator 5 and the second voltage-controlled oscillator 6 are utilized to realize wide frequency coverage of 6-12 GHz. The switching is selected by the first alternative switch 4 and the second alternative switch 7. The output is coupled to one input of the second mixer of the mixer by means of a directional coupler 8.
When the frequency range of the coupling output is 6-8 GHz or 9.8-10.2 GHz, a 5GHz signal generated by a phase-locked loop circuit 23(PLL) of the dot frequency signal generating circuit enters the other input end of the second mixer 15 through the power divider 22, the sixth alternative switch 21 and the fifth alternative switch 17, and the frequency of 1-3 GHz or 4.8-5.2 GHz is output by mixing.
When the frequency range of the coupling output is 8-9.8 GHz or 10.2-12 GHz, a 5GHz signal generated by a phase-locked loop circuit 23(PLL) of the dot frequency signal generating circuit enters the other input end of the second mixer 15 through the power divider 22, the sixth alternative switch 21, the frequency doubler 20, the second band-pass filter 18 and the fifth alternative switch 17, and the frequency is mixed and output at 0.2-2 GHz.
When the second mixer 15 outputs a frequency of 0.2 to 2GHz or 1 to 3GHz after mixing, the frequency is selectively switched by the fourth alternative switch 14 and the third alternative switch 12, and enters the input end of the second frequency halver 10 through the low-pass filter 11.
When the second mixer 15 outputs 4.8 to 5.2GHz frequency by mixing, the frequency is input into one input end of the first mixer 13 through the fourth alternative switch 14, a 5GHz signal generated by a phase-locked loop circuit 23(PLL) of the dot frequency signal generation circuit enters the other input end of the first mixer 13 through the power divider 22, the second frequency divider 19 and the first band-pass filter 16, and the frequency of 2.3 to 2.7GHz output by mixing enters the input end of the first two-frequency divider 10 through the third alternative switch 12 and the low-pass filter 11.
The frequency output by the first two-frequency divider 10 enters the input end of the fractional frequency divider 9, the frequency of 0.1GHz obtained after fractional frequency division enters the phase discriminator 2 to be discriminated from the reference frequency, and the first two-way switch 4 is used for driving the first voltage-controlled oscillator 5 or the second voltage-controlled oscillator 6 to generate the broadband frequency of 6-12 GHz after the filtering by the loop filter 3.
It is to be understood that the above description is not intended to limit the present invention, and the present invention is not limited to the above examples, and those skilled in the art may make modifications, alterations, additions or substitutions within the spirit and scope of the present invention.
Claims (7)
1. A broadband low-phase noise frequency synthesizer is characterized by comprising a reference circuit, a broadband signal generating circuit, a mixing circuit, a dot frequency signal generating circuit and a decimal frequency dividing circuit which are connected with each other;
the broadband signal generating circuit comprises a first voltage-controlled oscillator and a second voltage-controlled oscillator which are connected in parallel, one end of the first voltage-controlled oscillator and one end of the second voltage-controlled oscillator are sequentially connected with a phase discriminator, a loop filter and a first alternative switch in series, and the other end of the first voltage-controlled oscillator and the other end of the second voltage-controlled oscillator are sequentially connected with a second alternative switch and a directional coupler in series;
the decimal frequency dividing circuit comprises a decimal frequency divider and a first two-frequency divider which are connected in series, and the decimal frequency divider is connected with the phase discriminator;
the frequency mixing circuit comprises a third alternative switch, a first frequency mixer, a fourth alternative switch and a second frequency mixer which are sequentially connected, the directional coupler is connected with the second frequency mixer, and the frequency mixing circuit is connected with the decimal frequency dividing circuit through a low-pass filter;
the dot frequency signal generating circuit comprises a phase-locked loop circuit, the phase-locked loop circuit is connected with a power divider, the power divider is connected with a first branch and a second branch which are connected in parallel, the first branch comprises a first band-pass filter and a second frequency divider which are connected in series, the second branch comprises a fifth alternative switch, a second band-pass filter, a frequency doubler and a sixth alternative switch which are connected in series, the output end of the first branch is connected with a first frequency mixer, and the output end of the second branch is connected with a second frequency mixer;
the input frequency range of one end of the first frequency mixer connected with the fourth alternative switch is 4.8-5.2 GHz, the input frequency of one end of the first frequency mixer connected with the dot frequency signal generating circuit is 2.5GHz, and the output frequency range of one end of the first frequency mixer connected with the third alternative switch is 2.3-2.7 GHz;
the input frequency range of the first frequency divider is 0.2-3 GHz, and the output frequency range is 0.1-1.5 GHz;
the input frequency range of the fractional frequency divider is 0.1-1.5 GHz, and the output frequency range of the fractional frequency divider is 0.1 GHz.
2. A wideband low phase noise frequency synthesizer as claimed in claim 1, wherein the signal frequency of said reference circuit is 100 MHz.
3. The wideband low phase noise frequency synthesizer of claim 1, wherein the output signal of the phase locked loop circuit is a 5GHz dot frequency signal, the output signal of the second divider has a frequency of 2.5GHz, and the center frequency of the first bandpass filter is 2.5 GHz.
4. The wideband low phase noise frequency synthesizer of claim 1, wherein the frequency of the output signal of the frequency doubler is 10GHz, and the center frequency of the second band pass filter is 10 GHz.
5. The wideband low phase noise frequency synthesizer of claim 1, wherein the first voltage controlled oscillator has an output frequency in the range of 6 to 9GHz and the second voltage controlled oscillator has an output frequency in the range of 9 to 12 GHz.
6. The wideband low phase noise frequency synthesizer of claim 1, wherein the frequency range of the directional coupler is 6-12 GHz.
7. The wideband low-phase-noise frequency synthesizer according to claim 1, wherein the second mixer has an input frequency range of 6 to 12GHz at an end connected to the directional coupler, an input frequency range of 5GHz or 10GHz at an end connected to the dot frequency signal generating circuit, and an output frequency range of 0.2 to 5.2GHz at an end connected to the fourth alternative switch.
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| CN201710251274.1A CN107196653B (en) | 2017-04-18 | 2017-04-18 | Broadband low-phase noise frequency synthesizer |
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| CN107196653B true CN107196653B (en) | 2020-04-21 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107968651B (en) * | 2017-11-20 | 2021-12-17 | 成都中创锐科信息技术有限公司 | Broadband signal generator |
| CN111669196B (en) * | 2019-03-05 | 2021-07-16 | 瑞昱半导体股份有限公司 | Device for processing signals |
| CN111416618A (en) * | 2020-03-24 | 2020-07-14 | 中星联华科技（北京）有限公司 | Clock data recovery method and circuit |
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| EP1357667B1 (en) * | 2002-04-23 | 2006-11-02 | Siemens S.p.A. | Frequency synthesizer and transceiver including same |
| CN103762978A (en) * | 2014-01-20 | 2014-04-30 | 东南大学 | Broadband low-phase noise frequency synthesizer without frequency divider based on harmonic mixing |
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| CN105071804A (en) * | 2015-07-23 | 2015-11-18 | 中国电子科技集团公司第四十一研究所 | Low phase noise wideband microwave local oscillator source circuit and realization method thereof |
| CN205051680U (en) * | 2015-09-30 | 2016-02-24 | 中星联华科技（北京）有限公司 | Frequency source generator |
| CN105553475A (en) * | 2015-12-18 | 2016-05-04 | 中国电子科技集团公司第四十一研究所 | High frequency point frequency source synthetic circuit based on digital frequency division and harmonic frequency mixing |
| CN105978562A (en) * | 2016-05-12 | 2016-09-28 | 中国电子科技集团公司第四十研究所 | Ultra-low phase noise and ultrahigh frequency resolution high-frequency narrowband synthesis source circuit and method |
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2017
- 2017-04-18 CN CN201710251274.1A patent/CN107196653B/en not_active Expired - Fee Related
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1357667B1 (en) * | 2002-04-23 | 2006-11-02 | Siemens S.p.A. | Frequency synthesizer and transceiver including same |
| CN203632646U (en) * | 2013-12-18 | 2014-06-04 | 中国电子科技集团公司第四十一研究所 | Microwave broadband frequency synthesis module |
| CN103762978A (en) * | 2014-01-20 | 2014-04-30 | 东南大学 | Broadband low-phase noise frequency synthesizer without frequency divider based on harmonic mixing |
| CN105071804A (en) * | 2015-07-23 | 2015-11-18 | 中国电子科技集团公司第四十一研究所 | Low phase noise wideband microwave local oscillator source circuit and realization method thereof |
| CN205051680U (en) * | 2015-09-30 | 2016-02-24 | 中星联华科技（北京）有限公司 | Frequency source generator |
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