CN109120291B - Three-channel variable frequency receiving assembly - Google Patents

Abstract

The invention discloses a three-channel variable frequency receiving component, which comprises: limiter A (1), limiter B (2), limiter C (3), single-pole double-throw switch A (4), single-pole double-throw switch B (5), single-pole double-throw switch C (6), low noise are put A (7), B (8) are put to the low noise, C (9) are put to the low noise, microwave filter A (10), still include: vector modulator a (16), vector modulator B (17), and vector modulator C (18). The invention can accurately adjust the signal amplitude and phase of the receiving channel by using the digital vector modulator, and solves the problem of poor amplitude-phase consistency between channels of the traditional frequency conversion receiving component.

Description

A three-channel frequency conversion receiving component

technical field

The invention relates to a receiving component, in particular to a three-channel frequency conversion receiving component.

Background technique

The traditional three-channel frequency conversion receiving component is composed of multi-level functional devices such as limiter, microwave switch, low noise amplifier, mixer, filter, attenuator, and amplifier. The differences in the device itself and the differences introduced in the assembly process make the three There is a certain amplitude and phase inconsistency in the receiving channels, and there is a lack of devices that can accurately adjust the signal amplitude and phase in the circuit, and the amplitude and phase consistency between channels is poor.

SUMMARY OF THE INVENTION

The purpose of the present invention is to provide a three-channel frequency conversion receiving assembly with high gain, large dynamic range and high amplitude and phase consistency between channels, which solves the problem of poor amplitude and phase consistency between channels of the traditional three-channel frequency conversion receiving assembly.

A three-channel variable frequency receiving component, comprising: limiter A, limiter B, limiter C, SPDT switch A, SPDT switch B, SPDT switch C, low noise amplifier A, low noise Amplifier B, Low Noise Amplifier C, Microwave Filter A, Microwave Filter B, Microwave Filter C, Digital Attenuator A, Digital Attenuator B, Digital Attenuator C, Mixer A, Mixer B, Mixer C, IF amplifier A, IF amplifier B, IF amplifier C, digital attenuator D, digital attenuator E, digital attenuator F, IF filter A, IF filter B, IF filter C, IF amplifier D, IF Amplifier E, IF Amplifier F, Digital Attenuator G, Digital Attenuator H, Digital Attenuator I, IF Amplifier G, IF Amplifier H, IF Amplifier I, IF Filter D, IF Filter E, IF Filter F, Calibration The signal source and the local oscillator signal source also include: vector modulator A, vector modulator B, and vector modulator C.

The input ends of limiter A, limiter B and limiter C are the three input ends of the frequency conversion receiving component, and the output ends of limiter A, limiter B and limiter C are respectively connected with the SPDT switch. A. SPDT switch B is connected to switch branch I of SPDT switch C, SPDT switch A, SPDT switch B and switch branch II of SPDT switch C are connected to the calibration signal source, SPDT The common terminals of throw switch A, SPDT switch B and SPDT switch C are respectively connected to the input terminals of low noise amplifier A, low noise amplifier B and low noise amplifier C. The output ends of the noise amplifier C are respectively connected with the input ends of the microwave filter A, the microwave filter B and the microwave filter C, and the output ends of the microwave filter A, the microwave filter B and the microwave filter C are respectively connected with the numerical control attenuator A , the input ends of the numerical control attenuator B and the numerical control attenuator C are connected, and the output ends of the numerical control attenuator A, the numerical control attenuator B and the numerical control attenuator C are respectively connected with the inputs of the vector modulator A, the vector modulator B and the vector modulator C. The outputs of the vector modulator A, the vector modulator B and the vector modulator C are connected to the radio frequency input ends of the mixer A, the mixer B and the mixer C respectively. The local oscillator terminals of mixer B and mixer C are connected to the local oscillator signal source, and the intermediate frequency output terminals of mixer A, mixer B and mixer C are respectively connected to the inputs of intermediate frequency amplifier A, intermediate frequency amplifier B and intermediate frequency amplifier C. The output ends of IF amplifier A, IF amplifier B and IF amplifier C are connected to the input ends of NC attenuator D, NC attenuator E and NC attenuator F respectively, NC attenuator D, NC attenuator E and NC attenuator The output ends of the device F are respectively connected with the input ends of the intermediate frequency filter A, the intermediate frequency filter B and the intermediate frequency filter C, and the output ends of the intermediate frequency filter A, the intermediate frequency filter B and the intermediate frequency filter C are respectively connected with the intermediate frequency amplifier D, intermediate frequency Amplifier E is connected to the input ends of the intermediate frequency amplifier F, and the output ends of the intermediate frequency amplifier D, the intermediate frequency amplifier E and the intermediate frequency amplifier F are respectively connected with the input ends of the numerically controlled attenuator G, the numerically controlled attenuator H and the numerically controlled attenuator I, and the numerically controlled attenuator G , the output ends of the numerical control attenuator H and the numerical control attenuator I are respectively connected with the input ends of the intermediate frequency amplifier G, the intermediate frequency amplifier H and the intermediate frequency amplifier I, and the output ends of the intermediate frequency amplifier G, the intermediate frequency amplifier H and the intermediate frequency amplifier I are respectively connected with the intermediate frequency filter. D. The input ends of the intermediate frequency filter E and the intermediate frequency filter F are connected, and the output ends of the intermediate frequency filter D, the intermediate frequency filter E and the intermediate frequency filter F are the three output ends of the frequency conversion receiving component.

The three-channel variable frequency receiving component is divided into two working modes: receiving and calibration. When the receiving mode is working, the calibration signal source is turned off. SPDT switch A, SPDT switch B and SPDT switch C are all connected to switch branch I. The three input signals of the antenna enter the receiving channel from limiter A, limiter B and limiter C respectively, and then transmit to SPDT switch A, SPDT switch B and SPDT switch C respectively after limiting. ; When the calibration mode is working, the calibration signal source is turned on, SPDT switch A, SPDT switch B and SPDT switch C are all connected to switch branch II, and the calibration signal passes through SPDT switch A and SPDT switch B respectively. and SPDT switch C into the receiving channel. For the first receiving channel, the single-pole double-throw switch A selects to receive the input signal or calibration signal, and then transmits the selected signal to the low-noise amplifier A, which is used for low-noise amplification; the amplified signal is The microwave filter A is filtered, then attenuated by the numerically controlled attenuator A, and then the amplitude and phase are adjusted by the vector modulator A, and then passed to the mixer A for mixing; The mixed IF signal is first amplified by the IF amplifier A, then attenuated by the numerically controlled attenuator D, filtered by the intermediate frequency filter A, further amplified by the intermediate frequency amplifier D, and then passed through the numerically controlled attenuator. G is attenuated, further amplified by the intermediate frequency amplifier G, and finally filtered and output by the intermediate frequency filter D. For the second receiving channel, the single-pole double-throw switch B selects to receive the input signal or the calibration signal, and then transmits the selected signal to the low-noise amplifier B for low-noise amplification; The microwave filter B performs filtering, then attenuates by the numerically controlled attenuator B, and then adjusts the amplitude and phase by the vector modulator B, and then transmits it to the mixer B for frequency mixing; The IF signal after mixing is first amplified by the IF amplifier B, then attenuated by the numerical control attenuator E, filtered by the intermediate frequency filter B, further amplified by the intermediate frequency amplifier E, and then passed through the numerical control attenuator. H is attenuated, further amplified by the intermediate frequency amplifier H, and finally filtered and output by the intermediate frequency filter E. For the third receiving channel, the single-pole double-throw switch C selects to receive the input signal or the calibration signal, and then transmits the selected signal to the low-noise amplifier C, which performs low-noise amplification by the low-noise amplifier C; the amplified signal is The microwave filter C is filtered, then attenuated by the numerically controlled attenuator C, and then the amplitude and phase are adjusted by the vector modulator C, and then passed to the mixer C for mixing; Provided by the vibration signal source; the mixed intermediate frequency signal is first amplified by the intermediate frequency amplifier C, then attenuated by the numerical control attenuator F, filtered by the intermediate frequency filter C, further amplified by the intermediate frequency amplifier F, and then passed through the numerical control attenuator. I is attenuated, further amplified by the intermediate frequency amplifier I, and finally filtered and output by the intermediate frequency filter F.

The four-stage amplifier in the channel enables the channel to have a receiving gain of up to 80dB, the three-stage digital attenuator enables the channel to have an automatic gain control range of 80dB, and the vector modulator enables the channel to have precise amplitude and phase adjustment. The invention has the advantages of high gain, large dynamic range, and high amplitude and phase consistency between channels.

Description of drawings

Figure 1 is a schematic structural diagram of a three-channel frequency conversion receiving component.

1. Limiter A 2. Limiter B 3. Limiter C 4. SPDT switch A 5. SPDT switch B

6. SPDT switch C 7. Low noise amplifier A 8. Low noise amplifier B 9. Low noise amplifier C 10. Microwave filter A

11. Microwave filter B 12. Microwave filter C 13. Digitally controlled attenuator A 14. Digitally controlled attenuator B

15. Digital Attenuator C 16. Vector Modulator A 17. Vector Modulator B 18. Vector Modulator C 19. Mixer A

20. Mixer B 21. Mixer C 22. IF Amplifier A 23. IF Amplifier B 24. IF Amplifier C

25. Digital attenuator D 26. Digital attenuator E 27. Digital attenuator F 28. IF filter A

29. IF filter B 30. IF filter C 31. IF amplifier D 32. IF amplifier E

33. IF Amplifier F 34. Digital Attenuator G 35. Digital Attenuator H 36. Digital Attenuator I 37. Intermediate Frequency Amplifier G

38. Intermediate frequency amplifier H 39. Intermediate frequency amplifier I 40. Intermediate frequency filter D 41. Intermediate frequency filter E

42. IF filter F 43. Calibration signal source 44. Local oscillator signal source.

Detailed ways

A three-channel frequency conversion receiving component, comprising: limiter A1, limiter B2, limiter C3, SPDT switch A4, SPDT switch B5, SPDT switch C6, low noise amplifier A7, low noise Amplifier B8, low noise amplifier C9, microwave filter A10, microwave filter B11, microwave filter C12, digital attenuator A13, digital attenuator B14, digital attenuator C15, mixer A19, mixer B20, mixer C21, IF amplifier A22, IF amplifier B23, IF amplifier C24, digital attenuator D25, digital attenuator E26, digital attenuator F27, IF filter A28, IF filter B29, IF filter C30, IF amplifier D31, IF Amplifier E32, IF amplifier F33, CNC attenuator G34, CNC attenuator H35, CNC attenuator I36, IF amplifier G37, IF amplifier H38, IF amplifier I39, IF filter D40, IF filter E41, IF filter F42, calibration The signal source 43 and the local oscillator signal source 44 further include: a vector modulator A16, a vector modulator B17 and a vector modulator C18.

The input ends of the limiter A1, the limiter B2 and the limiter C3 are the three input ends of the frequency conversion receiving component, and the output ends of the limiter A1, the limiter B2 and the limiter C3 are respectively connected with the SPDT switch. A4. The SPDT switch B5 is connected to the switch branch I of the SPDT switch C6, and the switch branch II of the SPDT switch A4, SPDT switch B5 and SPDT switch C6 is connected to the calibration signal source 43. The common terminals of double-throw switch A4, SPDT switch B5 and SPDT switch C6 are respectively connected to the input terminals of low-noise amplifier A7, low-noise amplifier B8 and low-noise amplifier C9, low-noise amplifier A7, low-noise amplifier B8 and The output ends of the low noise amplifier C9 are respectively connected with the input ends of the microwave filter A10, the microwave filter B11 and the microwave filter C12, and the output ends of the microwave filter A10, the microwave filter B11 and the microwave filter C12 are respectively connected with the numerical control attenuator A13, digitally controlled attenuator B14 and the input of digitally controlled attenuator C15 are connected, and the outputs of digitally controlled attenuator A13, digitally controlled attenuator B14 and digitally controlled attenuator C15 are connected to the vector modulator A16, vector modulator B17 and vector modulator C18 respectively. The input terminals are connected, and the output terminals of the vector modulator A16, the vector modulator B17 and the vector modulator C18 are respectively connected with the radio frequency input terminals of the mixer A19, the mixer B20 and the mixer C21. The mixer A19, the mixer The local oscillator terminals of the mixer B20 and the mixer C21 are connected to the local oscillator signal source 44, and the intermediate frequency output terminals of the mixer A19, the mixer B20 and the mixer C21 are respectively connected to the intermediate frequency amplifier A22, the intermediate frequency amplifier B23 and the intermediate frequency amplifier C24. The output ends of the IF amplifier A22, IF amplifier B23 and IF amplifier C24 are connected to the input ends of the numerical control attenuator D25, the numerical control attenuator E26 and the numerical control attenuator F27 respectively, the numerical control attenuator D25, the numerical control attenuator E26 and The output ends of the numerically controlled attenuator F27 are respectively connected with the input ends of the intermediate frequency filter A28, the intermediate frequency filter B29 and the intermediate frequency filter C30, and the output ends of the intermediate frequency filter A28, the intermediate frequency filter B29 and the intermediate frequency filter C30 are respectively connected with the intermediate frequency amplifier D31. , IF amplifier E32 is connected with the input end of IF amplifier F33, the output end of IF amplifier D31, IF amplifier E32 and IF amplifier F33 are connected with the input end of numerical control attenuator G34, numerical control attenuator H35 and numerical control attenuator I36 respectively, numerical control attenuation The outputs of the attenuator G34, the numerically controlled attenuator H35 and the numerically controlled attenuator I36 are respectively connected with the input ends of the intermediate frequency amplifier G37, the intermediate frequency amplifier H38 and the intermediate frequency amplifier I39, and the output ends of the intermediate frequency amplifier G37, the intermediate frequency amplifier H38 and the intermediate frequency amplifier I39 are respectively connected with the intermediate frequency The input ends of the filter D40, the intermediate frequency filter E41 and the intermediate frequency filter F42 are connected, and the output ends of the intermediate frequency filter D40, the intermediate frequency filter E41 and the intermediate frequency filter F42 are the three output ends of the frequency conversion receiving component.

The three-channel variable frequency receiving component is divided into two working modes: receiving and calibration. When the receiving mode is working, the calibration signal source 43 is turned off, and the SPDT switch A4, SPDT switch B5 and SPDT switch C6 are all connected to the switch branch I. The three-way input signals from the antenna enter the receiving channel through limiter A1, limiter B2 and limiter C3 respectively, and then transmit to SPDT switch A4, SPDT switch B5 and SPDT switch respectively after limiting. C6; when the calibration mode is working, the calibration signal source 43 is turned on, SPDT switch A4, SPDT switch B5 and SPDT switch C6 are all connected to switch branch II, and the calibration signal passes through SPDT switch A4, SPDT switch A4, SPDT switch C6 Switch B5 and SPDT switch C6 enter the receive channel. For the first receiving channel, the single-pole double-throw switch A4 selects to receive the input signal or calibration signal, and then transmits the selected signal to the low-noise amplifier A7, which is used for low-noise amplification; the amplified signal is The microwave filter A10 is filtered, then attenuated by the numerical control attenuator A13, and then adjusted by the vector modulator A16 for amplitude and phase, and then sent to the mixer A19 for frequency mixing; the local oscillator signal required by the mixer A19 is determined by the The IF signal after mixing is first amplified by the IF amplifier A22, then attenuated by the digital attenuator D25, filtered by the IF filter A28, further amplified by the IF amplifier D31, and then attenuated by the digital control. It is attenuated by the intermediate frequency amplifier G34 and further amplified by the intermediate frequency amplifier G37, and finally filtered and output by the intermediate frequency filter D40. For the second receiving channel, the single-pole double-throw switch B5 selects to receive the input signal or calibration signal, and then transmits the selected signal to the low-noise amplifier B8, and the low-noise amplifier B8 performs low-noise amplification; the amplified signal is The microwave filter B11 is filtered, then attenuated by the numerically controlled attenuator B14, and then adjusted by the vector modulator B17 for amplitude and phase, and then sent to the mixer B20 for frequency mixing; the local oscillator signal required by the mixer B20 is determined by this The mixed IF signal is first amplified by the IF amplifier B23, then attenuated by the digital attenuator E26, filtered by the IF filter B29, further amplified by the IF amplifier E32, and then attenuated by the digital control. It is attenuated by the intermediate frequency amplifier H35 and further amplified by the intermediate frequency amplifier H38, and finally filtered and output by the intermediate frequency filter E41. For the third receiving channel, the single-pole double-throw switch C6 selects to receive the input signal or calibration signal, and then transmits the selected signal to the low-noise amplifier C9, and the low-noise amplifier C9 performs low-noise amplification; the amplified signal is The microwave filter C12 performs filtering, then attenuates by the numerically controlled attenuator C15, and then adjusts the amplitude and phase by the vector modulator C18, and then transmits it to the mixer C21 for frequency mixing; the local oscillator signal required by the mixer C21 is determined by this The IF signal after mixing is first amplified by the IF amplifier C24, then attenuated by the numerical control attenuator F27, filtered by the IF filter C30, further amplified by the IF amplifier F33, and then attenuated by the numerical control. It is attenuated by the intermediate frequency amplifier I36 and further amplified by the intermediate frequency amplifier I39, and finally filtered and output by the intermediate frequency filter F42.

Claims (2)

1. A three-channel variable frequency receiving assembly, comprising: limiter A (1), limiter B (2), limiter C (3), SPDT switch A (4), SPDT switch B (5), SPDT switch C (6), low noise amplifier A (7), low noise amplifier B (8), low noise amplifier C (9), microwave filter A (10), microwave filter B ( 11), microwave filter C (12), digital attenuator A (13), digital attenuator B (14), digital attenuator C (15), mixer A (19), mixer B (20) , mixer C (21), IF amplifier A (22), IF amplifier B (23), IF amplifier C (24), digital attenuator D (25), digital attenuator E (26), digital attenuator F (27), intermediate frequency filter A (28), intermediate frequency filter B (29), intermediate frequency filter C (30), intermediate frequency amplifier D (31), intermediate frequency amplifier E (32), intermediate frequency amplifier F (33), numerical control Attenuator G (34), digital attenuator H (35), digital attenuator I (36), intermediate frequency amplifier G (37), intermediate frequency amplifier H (38), intermediate frequency amplifier I (39), intermediate frequency filter D (40 ), an intermediate frequency filter E (41), an intermediate frequency filter F (42), a calibration signal source (43) and a local oscillator signal source (44), characterized in that it further comprises: a vector modulator A (16), a vector modulator B(17) and vector modulator C(18); The input ends of the limiter A (1), the limiter B (2) and the limiter C (3) are the three input ends of the frequency conversion receiving component, the limiter A (1), the limiter B (2) ) and the output end of the limiter C (3) are respectively connected with the switch branch I of the SPDT switch A (4), the SPDT switch B (5) and the SPDT switch C (6). The switch branch II of switch A (4), SPDT switch B (5) and SPDT switch C (6) is connected to the calibration signal source (43), SPDT switch A (4), SPDT switch The common terminals of B (5) and SPDT switch C (6) are respectively connected to the input terminals of low noise amplifier A (7), low noise amplifier B (8) and low noise amplifier C (9). (7), the output terminals of the low noise amplifier B (8) and the low noise amplifier C (9) are respectively connected with the input terminals of the microwave filter A (10), the microwave filter B (11) and the microwave filter C (12). connected, the output ends of microwave filter A (10), microwave filter B (11) and microwave filter C (12) are respectively connected with numerically controlled attenuator A (13), numerically controlled attenuator B (14) and numerically controlled attenuator C The input ends of (15) are connected, and the output ends of the numerically controlled attenuator A (13), the numerically controlled attenuator B (14) and the numerically controlled attenuator C (15) are respectively connected with the vector modulator A (16), the vector modulator B (17 ) is connected to the input terminal of vector modulator C (18), the output terminals of vector modulator A (16), vector modulator B (17) and vector modulator C (18) are respectively connected to mixer A (19), The RF input terminals of mixer B (20) and mixer C (21) are connected, and the local oscillator terminals of mixer A (19), mixer B (20) and mixer C (21) are connected to this The vibration signal source (44) is connected, and the intermediate frequency output terminals of the mixer A (19), the mixer B (20) and the mixer C (21) are respectively connected with the intermediate frequency amplifier A (22) and the intermediate frequency amplifier B (23) It is connected to the input end of the intermediate frequency amplifier C (24), and the output ends of the intermediate frequency amplifier A (22), the intermediate frequency amplifier B (23) and the intermediate frequency amplifier C (24) are respectively connected with the numerical control attenuator D (25), the numerical control attenuator E ( 26) is connected to the input end of the numerical control attenuator F (27), and the output ends of the numerical control attenuator D (25), the numerical control attenuator E (26) and the numerical control attenuator F (27) are respectively connected with the intermediate frequency filter A (28) , The input ends of intermediate frequency filter B (29) and intermediate frequency filter C (30) are connected, and the output ends of intermediate frequency filter A (28), intermediate frequency filter B (29) and intermediate frequency filter C (30) are respectively connected with the intermediate frequency The input ends of the amplifier D (31), the intermediate frequency amplifier E (32) and the intermediate frequency amplifier F (33) are connected, and the output ends of the intermediate frequency amplifier D (31), the intermediate frequency amplifier E (32) and the intermediate frequency amplifier F (33) are respectively connected with the digital control. The input ends of the attenuator G (34), the numerically controlled attenuator H (35) and the numerically controlled attenuator I (36) are connected, and the numerically controlled attenuator G (34), the numerically controlled attenuator H (35) and the numerically controlled attenuator I (36) The outputs of , respectively, are The input ends of the intermediate frequency amplifier G (37), the intermediate frequency amplifier H (38) and the intermediate frequency amplifier I (39) are connected, and the output ends of the intermediate frequency amplifier G (37), the intermediate frequency amplifier H (38) and the intermediate frequency amplifier I (39) are respectively connected with The input ends of the intermediate frequency filter D (40), the intermediate frequency filter E (41) and the intermediate frequency filter F (42) are connected, and the intermediate frequency filter D (40), the intermediate frequency filter E (41) and the intermediate frequency filter F (42) ) are the three output ends of the frequency conversion receiving component. 2. A three-channel frequency conversion receiving assembly according to claim 1, wherein the working process of the three-channel frequency conversion receiving assembly is: the three-channel frequency conversion receiving assembly is divided into two working modes of receiving and calibration, and the receiving mode When working, the calibration signal source (43) is turned off, the SPDT switch A (4), SPDT switch B (5) and SPDT switch C (6) are all connected to the switch branch I, and the three-way input from the antenna The signal enters the receiving channel from limiter A (1), limiter B (2) and limiter C (3) respectively, and then is limited and then transmitted to SPDT switch A (4), SPDT switch A (4) and SPDT switch respectively. B (5) and SPDT switch C (6); the calibration signal source (43) is turned on when the calibration mode is working, SPDT switch A (4), SPDT switch B (5) and SPDT switch C ( 6) All switch branch II is turned on, and the calibration signal enters the receiving channel through SPDT switch A (4), SPDT switch B (5) and SPDT switch C (6) respectively; for the first receiving channel For example, the single-pole double-throw switch A (4) selects to receive the input signal or the calibration signal, and then transmits the selected signal to the low-noise amplifier A (7), which is amplified by the low-noise amplifier A (7); The signal is filtered by microwave filter A (10), then attenuated by numerically controlled attenuator A (13), and then adjusted in amplitude and phase by vector modulator A (16), and then transmitted to mixer A (19) The local oscillator signal required by the mixer A (19) is provided by the local oscillator signal source (44); the mixed intermediate frequency signal is first amplified by the intermediate frequency amplifier A (22), and then passed through the numerically controlled attenuator D ( 25) Attenuate, then filter through IF filter A (28), further amplify through IF amplifier D (31), attenuate through digital attenuator G (34), and further amplify through IF amplifier G (37) , and finally filtered and output by the intermediate frequency filter D (40); for the second receiving channel, the single-pole double-throw switch B (5) selects to receive the input signal or the calibration signal, and then transmits the selected signal to the low-noise amplifier B(8), low-noise amplification is performed by low-noise amplifier B(8); the amplified signal is filtered by microwave filter B(11), then attenuated by numerically controlled attenuator B(14), and then passed through vector modulator B (17) adjusts the amplitude and phase, and then transmits it to the mixer B (20) for mixing; the local oscillator signal required by the mixer B (20) is provided by the local oscillator signal source (44); The intermediate frequency signal is first amplified by the intermediate frequency amplifier B (23), then attenuated by the numerical control attenuator E (26), filtered by the intermediate frequency filter B (29), and further amplified by the intermediate frequency amplifier E (32), and then passed through the intermediate frequency amplifier E (32). The numerical control attenuator H (35) attenuates, and then further amplifies by the intermediate frequency amplifier H (38), and finally is filtered and output by the intermediate frequency filter E (41). For the third receiving channel, the single-pole double-throw switch C ( 6) Select to receive input signal or calibration signal, and then transmit the selected signal to the low noise amplifier C (9), and the low noise amplifier C (9) Carry out low-noise amplification; the amplified signal is filtered by microwave filter C (12), then attenuated by numerically controlled attenuator C (15), and then adjusted by vector modulator C (18) for amplitude and phase, and then transmitted to The mixer C (21) performs frequency mixing; the local oscillator signal required by the mixer C (21) is provided by the local oscillator signal source (44); the mixed intermediate frequency signal is first amplified by the intermediate frequency amplifier C (24), It is then attenuated by the numerically controlled attenuator F (27), filtered by the intermediate frequency filter C (30), further amplified by the intermediate frequency amplifier F (33), attenuated by the numerically controlled attenuator I (36), and then passed through the intermediate frequency Amplifier I (39) is further amplified and finally filtered and output by intermediate frequency filter F (42).

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