CN211702013U - Microwave signal source - Google Patents
Microwave signal source Download PDFInfo
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- CN211702013U CN211702013U CN202020778273.XU CN202020778273U CN211702013U CN 211702013 U CN211702013 U CN 211702013U CN 202020778273 U CN202020778273 U CN 202020778273U CN 211702013 U CN211702013 U CN 211702013U
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Abstract
The utility model relates to a microwave signal source, including local oscillator unit and radio frequency unit, the local oscillator unit connection has the control unit, the control unit is connected with the host computer, the host computer passes through AM modulation control local oscillator unit output frequency, the local oscillator unit includes first local oscillator unit and second local oscillator unit, first local oscillator unit connection has BPSK modulation circuit, be connected with first mixer between BPSK modulation circuit and the first local oscillator unit, first mixer output end is connected with the second mixer, the radio frequency unit is connected to the IF end of second mixer, second local oscillator unit connection has second amplifier circuit, second local oscillator unit connects the third mixer through second amplifier circuit, second local oscillator unit output signal is as the local oscillator signal of third mixer. The utility model is based on two ADF4350 chips, the single chip microcomputer is connected with the upper computer to carry out AM modulation, and simultaneously, the output frequency is 5031-5090.7MHz and the step is 1MHz through BPSK coding modulation; the internal circuit structure is optimized, and the production cost is reduced.
Description
Technical Field
The utility model relates to a wireless communication field especially relates to a microwave signal source.
Background
The electronic communication system usually needs a reference signal to work, so that the frequency of the reference signal is required to be variable, stray and low in phase noise, the frequency output is accurate, and the electronic communication system is particularly applied to the technical field of aviation and requires that the frequency output is 5GHz and the stepping accuracy is high.
The existing microwave signal source applied to the aviation field has high manufacturing cost and complex internal circuit structure.
Disclosure of Invention
The utility model provides a microwave signal source which is based on two ADF4350 chips and is AM modulated by a singlechip connected with an upper computer, and simultaneously, the output frequency is 5031-5090.7MHz and the step is 1MHz through BPSK coding modulation; the internal circuit structure is optimized, and the production cost is reduced.
In order to achieve the above object, the utility model adopts the following technical scheme:
a microwave signal source comprises a local oscillator unit and a radio frequency unit, wherein the local oscillator unit is connected with a control unit, the control unit is connected with an upper computer, the upper computer controls the output frequency of the local oscillator unit through AM modulation, the local oscillator unit comprises a first local oscillator unit and a second local oscillator unit, the first local oscillator unit is connected with a BPSK modulation circuit, a first mixer is connected between the BPSK modulation circuit and the first local oscillator unit, the output end of the first mixer is connected with a second mixer, the IF end of the second mixer is connected with the radio frequency unit, the second mixer is connected with a first amplifying circuit, and the output end of the first amplifying circuit is connected with a third mixer;
the second local oscillator unit is connected with a second amplifying circuit, the second local oscillator unit is connected with a third mixer through the second amplifying circuit, an output signal of the second local oscillator unit is used as a local oscillator signal of the third mixer, an IF end of the third mixer is connected with the first amplifying circuit, and an output end of the third mixer is connected with the third amplifying circuit.
Further, the control unit comprises a single chip microcomputer, the first local oscillation unit and the second local oscillation unit both comprise an ADF4350 chip, a loop filter is arranged on the periphery of the ADF4350 chip, CLK, DATA and LE pins of the ADF4350 chip are respectively connected with IO ports of the single chip microcomputer, the first local oscillation unit and the second local oscillation unit are both connected with a crystal oscillation unit, and RFOUTA + and RFOUTA-pins of the first local oscillation unit and the second local oscillation unit are both connected with a transformer and a resistance matching circuit.
Furthermore, the RFOUTA + and RFOUTA-pins of the first local oscillator unit are connected to the LO pin of the first mixer through a transformer and a resistance matching circuit, the output signal of the first local oscillator unit is used as the local oscillator signal of the first mixer, the BPSK modulation circuit includes an AD812 chip, the AD812 chip is used for amplifying the BPSK signal, the output end of the AD812 chip is connected to the IF pin of the first mixer, and the first mixer is used for BPSK encoding modulation.
Further, the first mixer and the second mixer each include an ADE30 chip, an output terminal of the first mixer is connected to an LO pin of the second mixer, a filter circuit is connected between the rf unit and an IF pin of the second mixer, an output terminal of the second mixer is connected to a first amplifier circuit through a resistance matching circuit, and the first amplifier circuit includes a radio frequency amplifier.
Furthermore, RFOUTA + and RFOUTA-pins of the second local oscillator unit are connected with a second amplifying circuit through a transformer and a resistance matching circuit, the second amplifying circuit comprises a radio frequency amplifier, the second local oscillator unit is connected with an LO pin of a third mixer through the second amplifying circuit, the third mixer comprises a SIM83LH chip, an IF pin of the SIM83LH chip is connected with an output end of the first amplifying circuit to form a loop, and an RF pin of the SIM83LH chip is connected with the third amplifying circuit.
Further, be connected with the communication unit between control unit and the host computer, the communication unit includes RS-232 communication module, RS-232 communication module includes DB9 connector and MAX3232 chip, the one end and the singlechip of MAX3232 chip are connected the other end and are connected the host computer through DB9 connector.
Through the technical scheme, the beneficial effects of the utility model are that:
the utility model discloses be provided with local oscillator unit and radio frequency unit, the local oscillator unit is connected with the control unit, the control unit is connected with the host computer, the host computer passes through AM modulation control local oscillator unit output frequency, the local oscillator unit includes first local oscillator unit and second local oscillator unit, first local oscillator unit is connected with BPSK modulation circuit, be connected with first mixer between BPSK modulation circuit and the first local oscillator unit, first mixer output end is connected with the second mixer, the IF end of second mixer connects the radio frequency unit, and the second mixer is connected with first amplifier circuit, the output of first amplifier circuit is connected with the third mixer;
the second local oscillator unit is connected with a second amplifying circuit, the second local oscillator unit is connected with a third mixer through the second amplifying circuit, an output signal of the second local oscillator unit is used as a local oscillator signal of the third mixer, an IF end of the third mixer is connected with the first amplifying circuit, and an output end of the third mixer is connected with the third amplifying circuit.
When the device is used, the output signal of the first local oscillator unit is adjusted through the BPSK modulation circuit, the upper computer performs AM modulation through the control unit, the modulated radio frequency signal and the signal of the second local oscillator unit are superposed, and finally the frequency of the output signal is 5031-5090.7 MHz. The internal circuit structure is simplified, the upper computer is used for adjusting the internal circuit structure, operation is convenient, and adjustment precision is high.
Drawings
Fig. 1 is one of the electrical schematic diagrams of a microwave signal source according to the present invention.
Fig. 2 is a second electrical schematic diagram of a microwave signal source according to the present invention.
Fig. 3 is a third electrical schematic diagram of a microwave signal source according to the present invention.
Fig. 4 is a fourth electrical schematic diagram of a microwave signal source according to the present invention.
The reference numbers in the drawings are as follows: the digital signal processing device comprises a local oscillation unit 1, a radio frequency unit 2, a control unit 3, a first mixer 4, a first amplifying circuit 5, a second mixer 6, a BPSK modulating circuit 7, a second amplifying circuit 8, a third mixer 9, a third amplifying circuit 10, a communication unit 11, a first local oscillation unit 101 and a second local oscillation unit 102.
Detailed Description
The following detailed description of the embodiments of the present invention is made with reference to the accompanying drawings:
as shown in fig. 1 to 4, a microwave signal source includes a local oscillator unit 1 and a radio frequency unit 2, where the local oscillator unit 1 is connected to a control unit 3, the control unit 3 is connected to an upper computer, the upper computer controls an output frequency of the local oscillator unit 1 through AM modulation, the local oscillator unit 1 includes a first local oscillator unit 101 and a second local oscillator unit 102, the first local oscillator unit 101 is connected to a BPSK modulation circuit 7, a first mixer 4 is connected between the BPSK modulation circuit 7 and the first local oscillator unit 101, an output end of the first mixer 4 is connected to a second mixer 6, an IF end of the second mixer 6 is connected to the radio frequency unit 2, the second mixer 6 is connected to a first amplifying circuit 5, and an output end of the first amplifying circuit 5 is connected to a third mixer 9;
the second local oscillation unit 102 is connected to a second amplifying circuit 8, the second local oscillation unit 102 is connected to a third mixer 9 through the second amplifying circuit 8, an output signal of the second local oscillation unit 102 serves as a local oscillation signal of the third mixer 9, an IF end of the third mixer 9 is connected to the first amplifying circuit 5, and an output end of the third mixer 9 is connected to a third amplifying circuit 10.
In order to simplify the circuit structure and save the production cost, the control unit 3 includes a single chip microcomputer, the first local oscillation unit 101 and the second local oscillation unit both include an ADF4350 chip, a loop filter is provided at the periphery of the ADF4350 chip, CLK, DATA and LE pins of the ADF4350 chip are respectively connected with the IO port of the single chip microcomputer, the first local oscillation unit 101 and the second local oscillation unit 102 are both connected with a crystal oscillation unit, and the RFOUTA + and RFOUTA-pins of the first local oscillation unit 101 and the second local oscillation unit 102 are both connected with a transformer and a resistance matching circuit.
In this embodiment, as shown in fig. 4, the single chip microcomputer employs an STC15W4K60S4_ LQFP44 chip, pins P0.6, P0.7, and P1.0 of the single chip microcomputer are respectively connected to pins LE, DATA, and CLK of the first local oscillation unit 101ADF4350 chip, pins P1.4 to P1.6 of the single chip microcomputer are respectively connected to pins LE, DATA, and CLK of the second local oscillation unit 102ADF4350 chip, and pins RXD and TXD of the single chip microcomputer are connected to a MAX3232 chip.
In order to ensure that the input signal of the BPSK modulation circuit 7 is not distorted, the RFOUTA + and RFOUTA-pins of the first local oscillator unit 101 are connected to the LO pin of the first mixer 4 through the transformer and the resistance matching circuit, the output signal of the first local oscillator unit 101 is used as the local oscillator signal of the first mixer 4, the BPSK modulation circuit 7 includes an AD812 chip, the AD812 chip is used for amplifying the BPSK signal, an output end of the AD812 chip is connected to the IF pin of the first mixer 4, the first mixer 4 is used for BPSK coding modulation, as shown in fig. 2, the output signal of the first mixer 4 at this moment is 1131MHz + BPSK.
In order to facilitate AM modulation of 1131MHz + BPSK signals, the first mixer 4 and the second mixer 6 each include an ADE30 chip, an output end of the first mixer 4 is connected to an LO pin of the second mixer 6, a filter circuit is connected between the rf unit 2 and an IF pin of the second mixer 6, an output end of the second mixer 6 is connected to the first amplifier circuit 5 through a resistance matching circuit, the first amplifier circuit 5 includes a radio frequency amplifier, in this embodiment, the radio frequency amplifier is TQP3M9009, and as shown in fig. 2, an output signal of the first mixer 4 at this moment is 1131MHz + BPSK + AM.
In order to optimize the product structure and enable the output frequency of the signal source to be 5GHz, RFOUTA + and RFOUTA-pins of the second local oscillation unit 102 are connected to the second amplification circuit 8 through a transformer and a resistance matching circuit, the second amplification circuit 8 includes a radio frequency amplifier, the second local oscillation unit 102 is connected to an LO pin of the third mixer 9 through the second amplification circuit 8, the third mixer 9 includes a SIM83LH chip, an IF pin of the SIM83LH chip is connected to an output end of the first amplification circuit 5 to form a loop, an RF pin of the SIM83LH chip is connected to the third amplification circuit 10, and the third amplification circuit 10 includes a radio frequency amplifier. In this embodiment, the radio frequency amplifier model of the second amplification circuit 8 and the third amplification circuit 10 is TQP3M 9009.
For convenience of man-machine interaction and signal adjustment, a communication unit 11 is connected between the control unit 3 and the upper computer, the communication unit 11 comprises an RS-232 communication module, the RS-232 communication module comprises a DB9 connector and a MAX3232 chip, one end of the MAX3232 chip is connected with the single chip microcomputer, and the other end of the MAX3232 chip is connected with the upper computer through the DB9 connector.
The above-mentioned embodiments are merely preferred embodiments of the present invention, and not intended to limit the scope of the present invention, so that equivalent changes or modifications made by the structure, features and principles of the present invention should be included in the claims of the present invention.
Claims (6)
1. A microwave signal source is characterized by comprising a local oscillator unit (1) and a radio frequency unit (2), the local oscillation unit (1) is connected with a control unit (3), the control unit (3) is connected with an upper computer, the upper computer controls the output frequency of the local oscillation unit (1) through AM modulation, the local oscillation unit (1) comprises a first local oscillation unit (101) and a second local oscillation unit (102), the first local oscillator unit (101) is connected with a BPSK modulation circuit (7), a first frequency mixer (4) is connected between the BPSK modulation circuit (7) and the first local oscillator unit (101), the output end of the first frequency mixer (4) is connected with a second frequency mixer (6), the IF end of the second mixer (6) is connected with the radio frequency unit (2), the second mixer (6) is connected with the first amplifying circuit (5), the output end of the first amplifying circuit (5) is connected with a third mixer (9);
the second local oscillator unit (102) is connected with a second amplifying circuit (8), the second local oscillator unit (102) is connected with a third mixer (9) through the second amplifying circuit (8), an output signal of the second local oscillator unit (102) serves as a local oscillator signal of the third mixer (9), an IF end of the third mixer (9) is connected with a first amplifying circuit (5), and an output end of the third mixer (9) is connected with a third amplifying circuit (10).
2. The microwave signal source according to claim 1, wherein the control unit (3) includes a single chip microcomputer, the first local oscillation unit (101) and the second local oscillation unit each include an ADF4350 chip, a loop filter is disposed on a periphery of the ADF4350 chip, CLK, DATA, and LE pins of the ADF4350 chip are respectively connected to IO ports of the single chip microcomputer, the first local oscillation unit (101) and the second local oscillation unit (102) are both connected to a crystal oscillation unit, and RFOUTA + and RFOUTA pins of the first local oscillation unit (101) and the second local oscillation unit (102) are both connected to a transformer and a resistance matching circuit.
3. The microwave signal source according to claim 2, wherein the RFOUTA + and RFOUTA-pins of the first local oscillation unit (101) are connected to the LO pin of the first mixer (4) through a transformer and a resistance matching circuit, the output signal of the first local oscillation unit (101) is used as the local oscillation signal of the first mixer (4), the BPSK modulation circuit (7) includes an AD812 chip, the AD812 chip is used for amplifying the BPSK signal, an output terminal of the AD812 chip is connected to the IF pin of the first mixer (4), and the first mixer (4) is used for BPSK coding modulation.
4. A microwave signal source according to claim 3, characterized in that the first mixer (4) and the second mixer (6) each comprise an ADE30 chip, the output of the first mixer (4) is connected to the LO pin of the second mixer (6), a filter circuit is connected between the rf unit (2) and the IF pin of the second mixer (6), the output of the second mixer (6) is connected to the first amplifier circuit (5) via a resistance matching circuit, and the first amplifier circuit (5) comprises an rf amplifier.
5. A microwave signal source according to claim 4, characterized in that the RFOUTA + and RFOUTA-pins of the second local oscillator unit (102) are connected to the second amplifying circuit (8) via a transformer and a resistance matching circuit, the second amplifying circuit (8) comprises a radio frequency amplifier, the second local oscillator unit (102) is connected to the LO pin of the third mixer (9) via the second amplifying circuit (8), the third mixer (9) comprises a SIM83LH chip, the IF pin of the SIM83LH chip is connected to the output of the first amplifying circuit (5) to form a loop, and the RF pin of the SIM83LH chip is connected to the third amplifying circuit (10).
6. The microwave signal source according to claim 5, wherein a communication unit (11) is connected between the control unit (3) and the upper computer, the communication unit (11) comprises an RS-232 communication module, the RS-232 communication module comprises a DB9 connector and a MAX3232 chip, one end of the MAX3232 chip is connected with the single chip microcomputer, and the other end of the MAX3232 chip is connected with the upper computer through the DB9 connector.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020778273.XU CN211702013U (en) | 2020-05-12 | 2020-05-12 | Microwave signal source |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020778273.XU CN211702013U (en) | 2020-05-12 | 2020-05-12 | Microwave signal source |
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| CN211702013U true CN211702013U (en) | 2020-10-16 |
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| CN202020778273.XU Active CN211702013U (en) | 2020-05-12 | 2020-05-12 | Microwave signal source |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113093614A (en) * | 2021-04-02 | 2021-07-09 | 北京航天雷特机电工程有限公司 | Microwave generating circuit and microwave generating device |
| JP7448262B2 (en) | 2021-04-02 | 2024-03-12 | 北京航天雷特机電工程有限公司 | Microwave generation circuit and microwave generator |
-
2020
- 2020-05-12 CN CN202020778273.XU patent/CN211702013U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113093614A (en) * | 2021-04-02 | 2021-07-09 | 北京航天雷特机电工程有限公司 | Microwave generating circuit and microwave generating device |
| CN113093614B (en) * | 2021-04-02 | 2022-07-15 | 北京航天雷特机电工程有限公司 | Microwave generating circuit and microwave generating device |
| JP7448262B2 (en) | 2021-04-02 | 2024-03-12 | 北京航天雷特机電工程有限公司 | Microwave generation circuit and microwave generator |
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