CN214101353U

CN214101353U - Q-band fast low-phase noise frequency source

Info

Publication number: CN214101353U
Application number: CN202121738912.0U
Authority: CN
Inventors: 葛鹏; 胡明武; 吴杰
Original assignee: Chengdu Ren Jian Microwave Technology Co ltd
Current assignee: Chengdu Ren Jian Microwave Technology Co ltd
Priority date: 2021-07-29
Filing date: 2021-07-29
Publication date: 2021-08-31
Anticipated expiration: 2031-07-29

Abstract

The utility model provides a Q-band fast low-phase noise frequency source, which comprises a power dividing module, wherein one output end of the power dividing module is sequentially connected with a comb spectrum generator A, a switch filtering module A, a mixer A and a filtering amplifier B; the other output end of the power dividing module is sequentially connected with a frequency multiplier A, a comb spectrum generator B and a switch filtering module B; the filter amplifier B is connected with one input end of the mixer B, and the switch filter module B is connected with the other input end of the mixer B; the output end of the mixer B is sequentially connected with a filter amplifier C, a frequency multiplier B and a filter amplifier D; the DDS module is connected with a mixer A through a filter amplifier A. The utility model discloses not only possess the advantage that the frequency hopping time is low to 400ns, still ensure simultaneously that the looks makes an uproar and be superior to-95 dBc/Hz @1kHz in 40GHz department. In addition, the frequency hopping source also has the advantages of wide working temperature range, low phase noise, good spurious suppression and the like.

Description

Q-band fast low-phase noise frequency source

Technical Field

The utility model belongs to the technical field of the frequency source and specifically relates to a quick low phase noise frequency source of Q wave band is related to.

Background

The signal source system is used as a microwave signal generating module, and the precision and stability of an output signal of the signal source system directly influence the performance of the whole microwave system. In recent years, along with the development of microwave systems, frequency agile signal sources are widely regarded, and due to the characteristic of rapid frequency switching, the anti-interference capability of radar and a communication system can be improved, so that the frequency agile signal source has important application value in the fields of frequency hopping communication, electronic countermeasure, test measurement and the like.

At present, the mainstream fast frequency hopping source cannot realize the compatibility of low phase noise and fast frequency hopping in a Q wave band.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a: aiming at the problems in the prior art, a Q-band rapid low-phase-noise frequency source is provided, and the problem that the conventional mainstream rapid frequency hopping source cannot realize compatibility of low-phase noise and rapid frequency hopping in a frequency band of 30GHz-50GHz and a Q band is solved.

The invention purpose of the utility model is realized by the following technical scheme:

a Q-band fast low-phase noise frequency source comprises a power division module, a comb spectrum generator A, a switch filter module A, a mixer A, DDS module (Direct Digital Synthesizer, DDS for short, Chinese name: Direct Digital frequency synthesis module), a filter amplifier A, a filter amplifier B, a frequency multiplier A, a comb spectrum generator B, a switch filter module B, a mixer B, a filter amplifier C, a frequency multiplier B and a filter amplifier D, wherein one output end of the power division module is sequentially connected with the comb spectrum generator A, the switch filter module A, the mixer A and the filter amplifier B, the other output end of the power division module is sequentially connected with the frequency multiplier A, the comb spectrum generator B and the switch filter module B, the filter amplifier B is connected with one input end of the mixer B, the switch filter module B is connected with the other input end of the mixer B, the output end of the frequency mixer B is sequentially connected with a filter amplifier C, a frequency multiplier B and a filter amplifier D, the DDS module is connected with a filter amplifier A, and the filter amplifier A is connected with the frequency mixer A.

As a further technical solution, the input terminal of the power dividing module is connected to an external reference generating circuit.

As a further technical scheme, the external reference generating circuit is a 100MHz signal generating circuit.

As a further technical scheme, the switch filtering module A is a switch filtering module capable of respectively outputting signals of 2.6GHz, 2.8 GHz, 3GHz, 3.2 GHz and 3.4 GHz.

As a further technical scheme, the switch filtering module B is a switch filtering module capable of respectively outputting signals of 2.6GHz, 2.8 GHz, 3GHz, 3.2 GHz and 3.4 GHz.

As a further technical scheme, the DDS module is used for generating signals of 400MHz-600 MHz.

Compared with the prior art, the utility model discloses a DDS technique, mixing technique, frequency multiplication technique combine to use for this frequency hopping source work not only possesses the advantage that the frequency hopping time is low to 400ns at 33.5GHz-40GHz, still ensures simultaneously that the looks makes an uproar is superior to-95 dBc/Hz @1kHz in 40GHz department. In addition, the frequency hopping source has the advantages of wide working temperature range (-40 ℃ to +70 ℃), low phase noise, good spurious suppression and the like.

Drawings

Fig. 1 is a schematic diagram of the circuit structure of the present invention.

Detailed Description

The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.

Examples

The embodiment provides a Q-band fast low-phase-noise frequency source, which mainly adopts the combination of a DDS technology, a frequency mixing technology, a frequency division technology and a frequency doubling technology. The DDS technology is characterized in that: the input of a reference signal, the output of a DDS chip and the amplification output.

As shown in fig. 1, the frequency source includes a power division module, a comb spectrum generator a, a switch filter module a, a mixer A, DDS module, a filter amplifier a, a filter amplifier B, a frequency multiplier a, a comb spectrum generator B, a switch filter module B, a mixer B, a filter amplifier C, a frequency multiplier B, and a filter amplifier D. The input end of the power dividing module is connected with an external reference generating circuit. One output end of the power division module is sequentially connected with the comb spectrum generator A, the switch filtering module A, the frequency mixer A and the filtering amplifier B. The other output end of the power division module is sequentially connected with a frequency multiplier A, a comb spectrum generator B and a switch filtering module B. The filter amplifier B is connected with one input end of the mixer B, and the switch filter module B is connected with the other input end of the mixer B. The output end of the mixer B is sequentially connected with the filter amplifier C, the frequency multiplier B and the filter amplifier D. The DDS module is connected with a filter amplifier A, and the filter amplifier A is connected with a mixer A.

The external reference generating circuit is a 100MHz signal generating circuit. The switch filtering module A is a switch filtering module capable of respectively outputting signals of 2.6GHz, 2.8 GHz, 3GHz, 3.2 GHz and 3.4 GHz. The switch filtering module B is a switch filtering module capable of respectively outputting signals of 2.6GHz, 2.8 GHz, 3GHz, 3.2 GHz and 3.4 GHz. The DDS module is used for generating 400MHz-600MHz signals.

The Q-band fast low-phase noise frequency source mainly synthesizes reference signals into a 32G-40G broadband low-phase noise signal source, and the control circuit can also expand output frequency spectrum and can be expanded to 1KHz frequency stepping.

In the implementation process of the Q-band fast low-phase noise frequency source, a reference 100MHz signal enters a power division module and then is divided into two paths, one path enters a comb spectrum generator A to generate multiple paths of harmonic waves, and 2.6GHz, 2.8 GHz, 3GHz, 3.2 GHz or 3.4 GHz signals can be selectively output after filtering; and the other path enters a comb spectrum generator B after passing through a frequency multiplier A, and one of 13GHz, 14GHz, 15GHz, 16GHz and 17GHz is selected and output after filtering. An external input clock signal CLK generates a 400MHz-600MHz signal through a DDS, the signal is mixed with one of 2.6GHz, 2.8 GHz, 3GHz, 3.2 GHz and 3.4 GHz signals generated by the comb spectrum generator A after passing through a filter amplifier A, and then a signal covering 2.2 GHz-4 GHz can be generated. After the signal passes through the filter amplifier B, the signal is mixed with one of the 14GHz, 15GHz, 16GHz and 17GHz signals generated by the comb spectrum generator B through selection output, and then the signal in the range of 15.2GHz-21GHz can be output. And filtering, amplifying and frequency doubling the newly generated signal to obtain the final frequency output of 33.5GHz-40 GHz.

The utility model discloses an each index as follows:

1) output signal frequency: 32 GHz-40GHz (expandable)

2) Frequency resolution: 1MHz (step-by-step expansion can be carried out)

3) Frequency hopping time: not less than 400ns

4) Stray suppression: not less than 60dBc

5) Phase noise: less than or equal to-90 dBc/Hz @1 KHz.

Can know by the index the utility model discloses under the external input reference for 100MHz, the phase makes an uproar is-155 dBc/Hz @1 KHz's the condition, made an uproar and reached-90 dBc/Hz @1KHz at 40 GHz's output phase, reached theoretical upper limit basically, when keeping low phase noise output, still had the fast advantage of frequency hopping time.

The utility model discloses used the mixing formula phase-locked loop technique in the DDS technique, reunited broadband VCO technique, doubling of frequency technique, not only successfully realized the characteristics of the frequency spectrum output of output frequency bandwidth width (33.5G-40G), low phase noise (-80dBc/Hz @1k @ 40G). And a solid foundation is laid for the subsequent expansion of the ultra-wideband low-phase-noise frequency agility frequency source. The product has the technical index characteristics of wide band, low phase noise, short frequency hopping time and the like.

The Q-band fast low-phase-noise frequency source is a signal source product which synthesizes a reference signal into 33.5G-40G broadband, low-phase-noise and fast frequency conversion, can meet the general system-level requirement in company tests, can provide local oscillation signals for a system, can also be used as a self-checking signal source, and is widely applied to products which have higher phase noise requirement and fast frequency conversion speed.

The above description is only exemplary of the present invention and should not be taken as limiting, and all changes, equivalents, and improvements made within the spirit and principles of the present invention should be understood as being included in the scope of the present invention.

Claims

1. A Q-band fast low-phase-noise frequency source is characterized by comprising a power dividing module, a comb spectrum generator A, a switch filtering module A, a mixer A, DDS module, a filter amplifier A, a filter amplifier B, a frequency multiplier A, a comb spectrum generator B, a switch filtering module B, a mixer B, a filter amplifier C, a frequency multiplier B and a filter amplifier D, wherein one output end of the power dividing module is sequentially connected with the comb spectrum generator A, the switch filtering module A, the mixer A and the filter amplifier B, the other output end of the power dividing module is sequentially connected with the frequency multiplier A, the comb spectrum generator B and the switch filtering module B, the filter amplifier B is connected with one input end of the mixer B, the switch filtering module B is connected with the other input end of the mixer B, and the output end of the mixer B is sequentially connected with the filter amplifier C, the comb spectrum generator B and the switch filtering amplifier D, The DDS module is connected with a filter amplifier A, and the filter amplifier A is connected with a mixer A.

2. The Q-band fast low-phase-noise frequency source according to claim 1, wherein an input terminal of the power dividing module is connected to an external reference generating circuit.

3. The Q-band fast low-phase-noise frequency source according to claim 2, wherein the external reference generation circuit is a 100MHz signal generation circuit.

4. The Q-band fast low-phase-noise frequency source according to claim 1, wherein the switch filter module A is a switch filter module capable of outputting 2.6GHz, 2.8 GHz, 3GHz, 3.2 GHz and 3.4 GHz signals, respectively.

5. The Q-band fast low-phase-noise frequency source according to claim 1, wherein the switch filter module B is a switch filter module capable of outputting 2.6GHz, 2.8 GHz, 3GHz, 3.2 GHz and 3.4 GHz signals, respectively.

6. The Q-band fast low-phase-noise frequency source according to claim 1, wherein the DDS module is a DDS module generating 400MHz-600MHz signal.