CN210111948U - Comb signal source based on mixing modulation feedback loop - Google Patents
Comb signal source based on mixing modulation feedback loop Download PDFInfo
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Abstract
The utility model belongs to the electronic communication field specifically is a pectination signal source based on mixing modulation feedback loop. The microwave signal source comprises a local oscillator signal source, a first isolator, a first directional coupler, a first frequency mixer, an intermediate frequency signal source, a first microwave amplifier, a second directional coupler, a second isolator, an output antenna and a second microwave amplifier; the device can simultaneously generate comb-shaped frequency array signals with a plurality of dot frequencies, a loop circuit consisting of an amplifier is added on the basis of double-sideband frequency mixing, and the frequency mixer generates a nonlinear effect through the resonance of the loop circuit, so that the power of a plurality of frequencies is finally basically consistent, a series of frequency array signals are generated, and therefore, the frequency quantity is large, and the flatness of output power is high. The loop uses fewer devices, and therefore is low in cost.
Description
Technical Field
The utility model belongs to the electronic communication field, concretely relates to pectination signal source.
Background
Comb-shaped frequency signals have important applications in the fields of electronic circuits, radio frequency and the like, such as phase calibration, spread spectrum, frequency hopping communication or interference, multi-channel detection and the like.
At present, there are three main ways to generate comb frequency signals. The most common one is a tunnel diode, a step recovery diode and other devices, and the principle is that an energy storage element is charged and discharged to generate an ultrashort pulse signal, so that each order of harmonic wave is shaped. The bandwidth and power uniformity of the comb signal are mainly dependent on the inherent characteristics of the diode and are usually difficult to adjust. The second method is to use multiple independent microwave sources to synthesize, and each frequency point is independent. Because each frequency point can be adjusted independently, the power flatness can be good, but the phase consistency needs additional processing, and in addition, the cost is directly increased along with the increase of the number of channels. The third mode is to use a frequency mixer for frequency conversion, and output and generate a plurality of frequency conversion signals by utilizing the nonlinear effect when the local oscillator and the intermediate frequency signals are mixed, wherein the power flatness of the output comb spectrum can be adjusted by the phase difference of the two intermediate frequency signals. However, the characteristics of the output comb signals mainly depend on the inherent characteristics of the mixer, and generally, the frequency points are relatively few, the power of higher harmonic mixing is poor, and the adjustment range of the power flatness is very limited.
Disclosure of Invention
The utility model aims at providing a comb signal source based on mixing modulation feedback loop can export the signal source of a plurality of frequencies simultaneously, and power and flatness are high.
The technical scheme of the utility model as follows:
a comb signal source based on a frequency mixing modulation feedback loop comprises a local oscillation signal source, a first isolator, a first directional coupler, a first frequency mixer, an intermediate frequency signal source, a first microwave amplifier, a second directional coupler, a second isolator, an output antenna and a second microwave amplifier;
the output end of the local oscillator signal source is connected with the input end of the first isolator, the output end of the first isolator is connected with the input end of the first directional coupler, the output end of the first directional coupler is connected with the local oscillator end of the first frequency mixer, the output end of the intermediate frequency signal source is connected with the intermediate frequency end of the first frequency mixer, the radio frequency end of the first frequency mixer is connected with the input end of the first microwave amplifier, the output end of the first microwave amplifier is connected with the input end of the second directional coupler, the coupling end of the second directional coupler is connected with the input end of the second microwave amplifier, the output end of the second microwave amplifier is connected with the coupling end of the first directional coupler, the output end of the second directional coupler is connected with the input end of the second isolator, and the output end of the second isolator is connected with the input end of the output antenna.
A comb signal source based on a frequency mixing modulation feedback loop comprises a local oscillation signal source, a first isolator, a first power divider, a first frequency mixer, an intermediate frequency signal source, a first microwave amplifier, a second power divider, a second isolator, an output antenna and a second microwave amplifier;
the output end of the local oscillator signal source is connected with the input end of the first isolator, the output end of the first isolator is connected with the input end of the first power divider, the output end of the first power divider is connected with the local oscillator end of the first frequency mixer, the output end of the intermediate frequency signal source is connected with the intermediate frequency end of the first frequency mixer, the radio frequency end of the first frequency mixer is connected with the input end of the first microwave amplifier, the output end of the first microwave amplifier is connected with the input end of the second power divider, the coupling end of the second power divider is connected with the input end of the second microwave amplifier, the output end of the second microwave amplifier is connected with the coupling end of the first power divider, the output end of the second power divider is connected with the input end of the second isolator, and the output end of the second isolator is connected with the input end of the output antenna.
A comb signal source based on a frequency mixing modulation feedback loop comprises a local oscillation signal source, a first isolator, a first power divider, a first frequency mixer, an intermediate frequency signal source, a first microwave amplifier, a second power divider, a second isolator, an output antenna and a second microwave amplifier; the power divider also comprises a power dividing bridge, a second frequency mixer, a radio frequency power divider and a phase shifter;
the output end of the local oscillator signal source is connected with the input end of a first isolator, and the output end of the first isolator is connected with the input end of a first directional coupler;
the output end of the first directional coupler is connected with the input end of the power dividing bridge, two output ends of the power dividing bridge are respectively connected with the local oscillator end of the first frequency mixer and the local oscillator end of the second frequency mixer, the power dividing device is installed between the first frequency mixer and the intermediate frequency signal source, one of the two output ends of the power dividing device is connected with the intermediate frequency end of the first frequency mixer, the other output end of the power dividing device is connected with the input end of the phase shifter, and the output end of the phase shifter is connected with the intermediate frequency end of the second frequency mixer. The radio frequency ends of the first frequency mixer and the second frequency mixer are respectively connected with the input port of the radio frequency power divider, and the output end of the radio frequency power divider is connected with the input end of the first microwave amplifier;
the output end of the first microwave amplifier is connected with the input end of the second directional coupler, the coupling end of the second directional coupler is connected with the input end of the second microwave amplifier, the output end of the second microwave amplifier is connected with the coupling end of the first directional coupler, the output end of the second directional coupler is connected with the input end of the second isolator, and the output end of the second isolator is connected with the input end of the output antenna.
A comb signal source based on a frequency mixing modulation feedback loop comprises a local oscillation signal source, a first isolator, a first power divider, a first frequency mixer, an intermediate frequency signal source, a first microwave amplifier, a second power divider, a second isolator, an output antenna and a second microwave amplifier; the power divider also comprises a power dividing bridge, a second frequency mixer, a radio frequency power divider and a frequency multiplier;
the output end of the local oscillator signal source is connected with the input end of a first isolator, and the output end of the first isolator is connected with the input end of a first directional coupler;
the output end of the first directional coupler is connected with the input end of the power distribution bridge, two output ends of the power distribution bridge are respectively connected with the local oscillator end of the first frequency mixer and the local oscillator end of the second frequency mixer, the power distribution device is installed between the first frequency mixer and the intermediate frequency signal source, one of the two output ends of the power distribution device is connected with the intermediate frequency end of the first frequency mixer, the other output end of the power distribution device is connected with the input end of the frequency multiplier, and the output end of the frequency multiplier is connected with the intermediate frequency end of the second frequency mixer. The radio frequency ends of the first frequency mixer and the second frequency mixer are respectively connected with the input port of the radio frequency power divider, and the output end of the radio frequency power divider is connected with the input end of the first microwave amplifier;
the output end of the first microwave amplifier is connected with the input end of the second directional coupler, the coupling end of the second directional coupler is connected with the input end of the second microwave amplifier, the output end of the second microwave amplifier is connected with the coupling end of the first directional coupler, the output end of the second directional coupler is connected with the input end of the second isolator, and the output end of the second isolator is connected with the input end of the output antenna.
The utility model has the advantages as follows: the device can simultaneously generate comb frequency array signals with a plurality of dot frequencies. Compared with the prior art, the loop circuit composed of the amplifier is added on the basis of double-sideband frequency mixing, the frequency mixer generates a nonlinear effect through resonance of the loop circuit, power of a plurality of frequencies is finally basically consistent, and a series of frequency array signals are generated, so that the frequency quantity is large, and the flatness of output power is high. The loop uses fewer devices, and therefore is low in cost. In addition, the signal source is determined by the local oscillator and the intermediate frequency which are input from the outside, and the frequency interval and the number can be adjusted easily.
Drawings
FIG. 1 is a schematic diagram of a first embodiment of a comb signal source based on a mixed modulation feedback loop;
FIG. 2 is a schematic diagram of a second embodiment of a comb signal source based on a mixed modulation feedback loop;
in the figure: 1. a local oscillation signal source; 2. a first isolator; 3. a first directional coupler; 4. a first mixer; 5. a medium frequency signal source; 6. a first microwave amplifier; 7. a second directional coupler; 8. a second isolator; 9. an output antenna; 10. a second microwave amplifier; 11. a power dividing bridge; 12. a radio frequency power divider; 13. an intermediate frequency power divider; 14. a second mixer; 15. a phase shifter.
Detailed Description
The present invention will be further explained with reference to the drawings and the detailed description.
In the following description of the components, the terms "first" and "second" do not denote any logical relationship, but rather are used to distinguish two identical components included in the system.
One embodiment of the present invention as shown in figure 1 is:
the output end of the local oscillator signal source 1 is connected with the input end of the first isolator 2, the output end of the first isolator 2 is connected with the input end of the first directional coupler 3, the output end of the first directional coupler 3 is connected with the local oscillator end of the first frequency mixer 4, the output end of the intermediate frequency signal source 5 is connected with the intermediate frequency end of the first frequency mixer 4, the radio frequency end of the first frequency mixer 4 is connected with the input end of the first microwave amplifier 6, the output end of the first microwave amplifier 6 is connected with the input end of the second directional coupler 7, the coupling end of the second directional coupler 7 is connected with the input end of the second microwave amplifier 10, the output end of the second microwave amplifier 10 is connected with the coupling end of the first directional coupler 3, the output end of the second directional coupler 7 is connected with the input end of the second isolator 8, and the output end of the second isolator 8 is connected with the input end of the output antenna 9.
The local oscillator signal source 1 and the intermediate frequency signal source 5 are dot frequency signal sources, and are required to have power enough to drive the first mixer 4, and the value is generally 10-16 dBm.
The first isolator 2 is used for preventing microwaves generated by the mixing loop from transmitting into the local oscillator signal source 1, plays a role in protection, and has no direct influence on comb signals generated by the feedback loop.
The feedback loop based on mixing modulation comprises a first directional coupler 3, a first mixer 4, signal amplifiers 6, 10 and a second directional coupler 7. Wherein, the first directional coupler 3 synthesizes the loop feedback signal and the external signal and sends the synthesized signal to the first mixer 4; the first mixer 4 is used for generating a frequency-converted signal with a certain frequency difference with the output signal of the first directional coupler 3, and the frequency-converting mode is not limited to upper/lower single-sideband frequency mixing, double-sideband frequency mixing or more complex frequency-converting structures; the role of the first microwave amplifier 6 is to amplify the output of the first mixer 4, which determines the power of the final output comb signal; the second directional coupler 7 is used for deriving a signal of the loop as a final output and generating a signal for feedback, and requires a high isolation between two outputs of the device, and a device for realizing the function is not limited to the directional coupler, for example, a power divider can realize the same function; the second microwave amplifier 10 is used to amplify the feedback signal and feed it to the input of the power combiner in order to make the feedback signal power enough to drive the mixer into operation, its saturation power gain requirement is related to the driving power of the first mixer 4 and the second mixer 14, its saturation power is 19-21dBm, and the power gain is related to the loop loss, typically 20-30 dB.
The second isolator 8 is used to prevent the microwave from being reflected by the surrounding system, affecting the multi-feedback loop and thus the output frequency and power. In order to reduce the influence of an external system on a signal source, the isolation is generally required to be 20-30 dB.
The working mode of the feedback loop is as follows: the dot frequency signal output by the local oscillator signal source 1 reaches the input end of the first frequency mixer 4 through the first isolator 2 and the first directional coupler 3 to be used as the local oscillator signal, the dot frequency signal output by the intermediate frequency signal source 5 is input to the intermediate frequency input end of the first frequency mixer 4, the frequency output by the first frequency mixer 4 comprises double-sideband frequency conversion or harmonic frequency conversion and the like according to the working mode of the frequency mixer, the frequency conversion signal output by the first frequency mixer 4 is amplified and then is coupled with a part of power by the second directional coupler 7 to be amplified by the second microwave amplifier 10, and finally, the dot frequency signal output by the local oscillator signal source 1 is looped back and combined in the first directional coupler 3, so that a loop consisting of the frequency mixer and the amplifier is formed.
A simplification of the present feedback loop is understood to be: after the loop starts to be powered on, the first directional coupler 3 combines the output signal to have a plurality of frequency points through the loop, and the first frequency mixer 4 mixes the frequency points again to generate frequency point expansion towards higher order waves, so as to generate comb-shaped frequency array signals which take the frequency of the local oscillation signal 1 as the center and the frequency of the intermediate frequency signal 5 as intervals. The central reference frequency point of the comb signal is determined by the local oscillator signal source 1, the frequency point interval of the comb signal is determined by the intermediate frequency signal source 5, and the output power of the comb signal is mainly determined by the first microwave amplifier 6.
The total gain of the first microwave amplifier 6 and the second microwave amplifier 10 needs to be larger than the total loss of the whole feedback loop, the total loss of the loop includes the frequency conversion loss of the frequency mixer, the coupling degree of the directional coupler, the insertion loss of the connecting wire and the like, and in order to ensure the stable and reliable operation of the system, the total gain of the first microwave amplifier 6 and the second microwave amplifier 10 is 5-10 dB larger than the total loss.
The number of outputs and the power distribution of the comb frequency array signal are mainly determined by the response of the amplifier and the loop-back to the respective frequencies. Where the flatness of the comb signal is mainly determined by the characteristics of the first mixer 4 and the frequency bandwidth of the comb signal is mainly determined by the operating frequency bands of all devices in the feedback loop, in general a band-pass filter may be added in the feedback loop to limit the bandwidth of the comb signal, which filter may be added between any two components of the loop, such as between the first mixer 4 and the first microwave amplifier 6, or between the microwave amplifier 6 and the second directional coupler 7.
Based on the basis of embodiment 1, the comb signal source based on the mixed frequency modulation feedback loop of the present invention can be further changed into a composite structure as shown in fig. 2, so as to further improve the power division flatness and distribution of the comb signal. Fig. 2 shows a schematic diagram of a comb-shaped frequency signal source structure using a composite frequency conversion structure in a second embodiment of the present invention.
As shown in fig. 2, a power dividing bridge 11, a second mixer 14, a radio frequency power divider 13, and a radio frequency power divider 12 are added to the feedback loop of embodiment 1. That is, the output end of the first directional coupler 3 is connected to the input end of the power dividing bridge 11, two output ends of the power dividing bridge 11 are respectively connected to the local oscillator end of the first mixer 4 and the local oscillator end of the second mixer 14, the power divider 13 is installed between the first mixer 4 and the intermediate frequency signal source 5, one of two output ends of the power divider 13 is connected to the intermediate frequency end of the first mixer 4, the other output end of the power divider 13 is connected to the input end of the phase shifter 15, and the output end of the phase shifter 15 is connected to the intermediate frequency end of the second mixer 14. The radio frequency ends of the first mixer 4 and the second mixer 14 are respectively connected to the input port of the radio frequency power divider 12, and the output end of the radio frequency power divider 12 is connected to the input end of the first microwave amplifier 6.
The power dividing bridge 11 may be a quadrature bridge or an angle-adjustable bridge. The intermediate frequency signal 5 is divided into one signal path by the power divider 13 to the phase shifter 15, and finally output to the intermediate frequency input end of the second mixer 14. By adjusting the phase angles of the power dividing bridge 11 and the phase shifter 15, the power flatness of the comb-shaped frequency array signal can be adjusted.
In the embodiment of fig. 2, the phase shifter 15 can be replaced by a frequency multiplier for outputting the higher harmonics of the intermediate frequency signal 5 to the second mixer 14 to expand the frequency number of the comb signal.
The present invention has been described in detail with reference to the drawings and the embodiments, but the present invention is not limited to the above-described embodiments, and various changes can be made within the knowledge of those skilled in the art without departing from the gist of the present invention. The technique can be used for other radio frequency signal segments besides the microwave frequency band. The comb-shaped multi-beam signal source can be used in various microwave band and radio frequency band systems, and is particularly suitable for military and civil use such as microwave reflection, radar measurement, communication and the like.
Claims (10)
1. A comb signal source based on a mixing modulation feedback loop is characterized in that: the device comprises a local oscillator signal source (1), a first isolator (2), a first directional coupler (3), a first frequency mixer (4), an intermediate frequency signal source (5), a first microwave amplifier (6), a second directional coupler (7), a second isolator (8), an output antenna (9) and a second microwave amplifier (10);
wherein, the output end of the local oscillator signal source (1) is connected with the input end of a first isolator (2), the output end of the first isolator (2) is connected with the input end of a first directional coupler (3), the output end of the first directional coupler (3) is connected with the local oscillator end of a first frequency mixer (4), the output end of an intermediate frequency signal source (5) is connected with the intermediate frequency end of the first frequency mixer (4), the radio frequency end of the first frequency mixer (4) is connected with the input end of a first microwave amplifier (6), the output end of the first microwave amplifier (6) is connected with the input end of a second directional coupler (7), the coupling end of the second directional coupler (7) is connected with the input end of a second microwave amplifier (10), the output end of the second microwave amplifier (10) is connected with the coupling end of the first directional coupler (3), the output end of the second directional coupler (7) is connected with the input end of a second isolator (8), the output end of the second isolator (8) is connected with the input end of the output antenna (9).
2. A comb signal source based on a mixed modulation feedback loop according to claim 1, characterized in that: the local oscillator signal source (1) and the intermediate frequency signal source (5) are point frequency signal sources, and the power range is 10-16 dBm.
3. A comb signal source based on a mixed modulation feedback loop according to claim 1, characterized in that: the power gain of the second microwave amplifier (10) is 20-30 dB.
4. A comb signal source based on a mixed modulation feedback loop according to claim 1, characterized in that: the isolation degree of the second isolator (8) is 20-30 dB.
5. A comb signal source based on a mixing modulation feedback loop is characterized in that: the device comprises a local oscillation signal source (1), a first isolator (2), a first power divider, a first frequency mixer (4), an intermediate frequency signal source (5), a first microwave amplifier (6), a second power divider, a second isolator (8), an output antenna (9) and a second microwave amplifier (10);
the output end of the local oscillator signal source (1) is connected with the input end of a first isolator (2), the output end of the first isolator (2) is connected with the input end of a first power divider, the output end of the first power divider is connected with the local oscillator end of a first frequency mixer (4), the output end of an intermediate frequency signal source (5) is connected with the intermediate frequency end of the first frequency mixer (4), the radio frequency end of the first frequency mixer (4) is connected with the input end of a first microwave amplifier (6), the output end of the first microwave amplifier (6) is connected with the input end of a second power divider, the coupling end of the second power divider is connected with the input end of a second microwave amplifier (10), the output end of the second microwave amplifier (10) is connected with the coupling end of the first power divider, the output end of the second power divider is connected with the input end of a second isolator (8), and the output end of the second isolator (8) is connected with the input end of an output antenna (9).
6. The comb signal source according to claim 5, wherein: the local oscillator signal source (1) and the intermediate frequency signal source (5) are dot frequency signal sources, and the power range is 10-16 dBm.
7. The comb signal source according to claim 5, wherein: the power gain of the second microwave amplifier (10) is 20-30 dB.
8. The comb signal source according to claim 5, wherein: the isolation degree of the second isolator (8) is 20-30 dB.
9. A comb signal source based on a mixing modulation feedback loop is characterized in that: the device comprises a local oscillation signal source (1), a first isolator (2), a first power divider, a first frequency mixer (4), an intermediate frequency signal source (5), a first microwave amplifier (6), a second power divider, a second isolator (8), an output antenna (9) and a second microwave amplifier (10); the power divider also comprises a power dividing bridge (11), a second frequency mixer (14), a radio frequency power divider (13), a radio frequency power divider (12) and a phase shifter (15);
the output end of the local oscillator signal source (1) is connected with the input end of the first isolator (2), and the output end of the first isolator (2) is connected with the input end of the first directional coupler (3);
the output end of the first directional coupler (3) is connected with the input end of a power dividing bridge (11), two output ends of the power dividing bridge (11) are respectively connected with a local oscillator end of a first mixer (4) and a local oscillator end of a second mixer (14), a power divider (13) is installed between the first mixer (4) and an intermediate frequency signal source (5), one of the two output ends of the power divider (13) is connected with the intermediate frequency end of the first mixer (4), the other output end of the power divider (13) is connected with the input end of a phase shifter (15), the output end of the phase shifter (15) is connected with the intermediate frequency end of the second mixer (14), the radio frequency ends of the first mixer (4) and the second mixer (14) are respectively connected with the input port of a radio frequency power divider (12), and the output end of the radio frequency power divider (12) is connected with the input end of a first microwave amplifier (6);
the output end of the first microwave amplifier (6) is connected with the input end of the second directional coupler (7), the coupling end of the second directional coupler (7) is connected with the input end of the second microwave amplifier (10), the output end of the second microwave amplifier (10) is connected with the coupling end of the first directional coupler (3), the output end of the second directional coupler (7) is connected with the input end of the second isolator (8), and the output end of the second isolator (8) is connected with the input end of the output antenna (9).
10. A comb signal source based on a mixing modulation feedback loop is characterized in that: the device comprises a local oscillation signal source (1), a first isolator (2), a first power divider, a first frequency mixer (4), an intermediate frequency signal source (5), a first microwave amplifier (6), a second power divider, a second isolator (8), an output antenna (9) and a second microwave amplifier (10); the frequency divider also comprises a power dividing bridge (11), a second frequency mixer (14), a radio frequency power divider (13), a radio frequency power divider (12) and a frequency multiplier;
the output end of the local oscillator signal source (1) is connected with the input end of the first isolator (2), and the output end of the first isolator (2) is connected with the input end of the first directional coupler (3);
the output end of the first directional coupler (3) is connected with the input end of a power dividing bridge (11), two output ends of the power dividing bridge (11) are respectively connected with a local oscillator end of a first mixer (4) and a local oscillator end of a second mixer (14), a power divider (13) is installed between the first mixer (4) and an intermediate frequency signal source (5), one of two output ends of the power divider (13) is connected with the intermediate frequency end of the first mixer (4), the other output end of the power divider (13) is connected with the input end of a frequency multiplier, the output end of the frequency multiplier is connected with the intermediate frequency end of the second mixer (14), the radio frequency ends of the first mixer (4) and the second mixer (14) are respectively connected with the input port of a radio frequency power divider (12), and the output end of the radio frequency power divider (12) is connected with the input end of a first microwave amplifier (6);
the output end of the first microwave amplifier (6) is connected with the input end of the second directional coupler (7), the coupling end of the second directional coupler (7) is connected with the input end of the second microwave amplifier (10), the output end of the second microwave amplifier (10) is connected with the coupling end of the first directional coupler (3), the output end of the second directional coupler (7) is connected with the input end of the second isolator (8), and the output end of the second isolator (8) is connected with the input end of the output antenna (9).
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111987995A (en) * | 2019-05-24 | 2020-11-24 | 核工业西南物理研究院 | Comb signal source based on mixing modulation feedback loop |
| CN115276832A (en) * | 2021-04-29 | 2022-11-01 | 核工业西南物理研究院 | Multi-point bandwidth frequency band microwave diagnosis system based on double comb-shaped frequencies |
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2019
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111987995A (en) * | 2019-05-24 | 2020-11-24 | 核工业西南物理研究院 | Comb signal source based on mixing modulation feedback loop |
| CN115276832A (en) * | 2021-04-29 | 2022-11-01 | 核工业西南物理研究院 | Multi-point bandwidth frequency band microwave diagnosis system based on double comb-shaped frequencies |
| CN115276832B (en) * | 2021-04-29 | 2024-02-09 | 核工业西南物理研究院 | Multi-point frequency broadband microwave diagnosis system based on double comb frequencies |
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