CN210431398U - MB waveband receiving channel assembly - Google Patents
MB waveband receiving channel assembly Download PDFInfo
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- CN210431398U CN210431398U CN201922276916.0U CN201922276916U CN210431398U CN 210431398 U CN210431398 U CN 210431398U CN 201922276916 U CN201922276916 U CN 201922276916U CN 210431398 U CN210431398 U CN 210431398U
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Abstract
The utility model discloses an MB waveband receiving channel assembly, which comprises a radio frequency receiving circuit, an AGC loop, a first filter and a demodulation circuit which are connected in sequence; the radio frequency receiving circuit comprises a self-checking signal circuit, a signal preselection circuit, a single-pole double-throw switch, a first amplifier, a frequency mixer, a local oscillator signal circuit, a second filter and a second amplifier, wherein the output ends of the self-checking signal circuit and the signal preselection circuit are respectively connected with two fixed ends of the single-pole double-throw switch, the movable end of the single-pole double-throw switch, the first amplifier, the frequency mixer, the second filter and the second amplifier are sequentially connected, and the output end of the local oscillator signal circuit is connected to the frequency mixer; the receiving channel assembly has good stray rejection capability and performance stability.
Description
Technical Field
The utility model relates to a microwave communication technique, especially MB wave band receive channel subassembly.
Background
Modern general receivers tend to have high performance and high integration degree in the design process, and the performance of the receivers requires high sensitivity, high resolution and good continuous and stable working capability, so that the anti-interference capability and the working stability of the receivers are required to be improved as much as possible, and the signal distortion, the bit error rate and the fault frequency of the receivers are reduced.
Therefore, it is desirable that the interference suppression capability and stability of the receiver receiving channel can be further improved.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to overcome prior art's not enough, provide a better MB wave band receiving channel subassembly with good stray inhibition ability and stability performance.
The purpose of the utility model is realized through the following technical scheme:
the MB waveband receiving channel assembly comprises a radio frequency receiving circuit, an AGC loop, a first filter and a demodulation circuit which are connected in sequence; wherein the content of the first and second substances,
the radio frequency receiving circuit comprises a self-checking signal circuit, a signal preselection circuit, a single-pole double-throw switch, a first amplifier, a frequency mixer, a local oscillator signal circuit, a second filter and a second amplifier, wherein the output ends of the self-checking signal circuit and the signal preselection circuit are respectively connected with two fixed ends of the single-pole double-throw switch, the movable end of the single-pole double-throw switch, the first amplifier, the frequency mixer, the second filter and the second amplifier are sequentially connected, and the output end of the local oscillator signal circuit is connected to the frequency mixer;
the self-checking signal circuit comprises a self-checking signal generator, the input end of the self-checking signal generator receives a self-checking enabling signal and/or a self-checking audio signal, and the output end of the self-checking signal generator is connected with the fixed end of the single-pole double-throw switch;
the signal preselection circuit comprises an amplitude limiter and a preselection device which are connected in sequence;
the AGC loop is used for processing the intermediate frequency signal output by the radio frequency receiving circuit;
and the demodulation circuit demodulates the intermediate frequency signal processed by the AGC loop.
Furthermore, the first filter and the second filter are both intermediate frequency filters and are used for filtering stray interference caused by radio frequency signals and local oscillation signals, the first amplifier is a low noise amplifier, and the second amplifier is an intermediate frequency amplifier with a frequency selection function.
Further, the AGC loop comprises a third amplifier, a fourth amplifier, an envelope detector, a third filter and a fifth amplifier which are sequentially connected in an annular shape.
Further, the third amplifier and the fourth amplifier are both intermediate frequency amplifiers with frequency selection function, the third filter is a low-pass filter, and the fifth amplifier is an AGC amplifier.
Further, the demodulation circuit comprises a demodulator, a fourth filter and a rectifying device which are connected in sequence, and the fourth filter is a band-pass filter.
Further, the demodulation circuit further comprises a power divider, a plurality of fourth filters, a plurality of rectifying devices and a plurality of gating switches, and the power divider, the fourth filters, the rectifying devices and the gating switches are connected in sequence.
The utility model has the advantages of it is following:
1. the signal received by the receiving channel component firstly passes through a signal preselection circuit, thereby achieving good image interference suppression effect;
2. the receiving channel assembly has good stray inhibition capability, and the sensitivity of the receiving channel is greatly improved;
3. the receiving channel component has an excellent gain control loop and a self-checking circuit, and has good performance stability.
Drawings
Fig. 1 is a circuit diagram of a receive channel assembly of the present invention;
in the figure, 1-limiter, 2-preselector, 3-single-pole double-throw switch, 4-self-checking signal generator, 5-first amplifier, 6-mixer, 7-second filter, 8-second amplifier, 9-third amplifier, 10-fourth amplifier, 11-envelope filter, 12-third filter, 13-fifth amplifier, 14-first filter, 15-demodulator, 16-power divider, 17-fourth filter, 18-rectifier device and 19-gating switch.
Detailed Description
To make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the following description will clearly describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
The present embodiment provides an MB band reception channel component including a radio frequency reception circuit, an AGC loop, a first filter 14, and a demodulation circuit connected in this order.
As shown in fig. 1, the radio frequency receiving circuit includes a self-test signal circuit, a signal preselection circuit, a single-pole double-throw switch 3, a first amplifier 5, a mixer 6, a local oscillator signal circuit, a second filter 7, and a second amplifier 8, output ends of the self-test signal circuit and the signal preselection circuit are respectively connected to two fixed ends of the single-pole double-throw switch 3, a movable end of the single-pole double-throw switch 3, the first amplifier 5, the mixer 6, the second filter 7, and the second amplifier 8 are sequentially connected, and an output end of the local oscillator signal circuit is connected to the mixer 6.
The self-checking signal circuit comprises a self-checking signal generator 4, the input end of the self-checking signal generator 4 receives a self-checking enabling signal and/or a self-checking audio signal, and the output end of the self-checking signal generator 4 is connected with the fixed end of the single-pole double-throw switch 3.
The self-checking signal circuit can directly input a self-checking enabling signal to carry out self-checking through the single-pole double-throw switch 3 to the radio frequency receiving circuit, and can carry out self-checking through the self-checking signal generator 4 and then through the single-pole double-throw switch 3 to the radio frequency receiving circuit.
The signal preselection circuit comprises an amplitude limiter 1 and a preselection device 2 which are connected in sequence; the signal preselection circuit can provide good image rejection, with image rejection higher than-79 dB.
The AGC loop is used for processing the intermediate frequency signal output by the radio frequency receiving circuit; the intermediate frequency signal processed by the AGC loop has the characteristic of high linearity, so that the fluctuation amplitude of the output intermediate frequency signal is small, and the AGC dynamic range in the receiving channel component is 80 dB.
And the demodulation circuit demodulates the intermediate frequency signal processed by the AGC loop.
The first filter 14 and the second filter 7 are both intermediate frequency filters, and are configured to filter stray interference caused by radio frequency signals and local oscillation signals, the first amplifier 5 is a low noise amplifier, and the second amplifier 8 is an intermediate frequency amplifier having a frequency selection function.
The AGC loop comprises a third amplifier 9, a fourth amplifier 10, an envelope detector, a third filter 12 and a fifth amplifier 13 which are sequentially connected in an annular mode, an intermediate frequency signal processed by the AGC loop has the characteristic of high linearity, the fluctuation range of the output intermediate frequency signal is small, and the AGC dynamic range in the receiving channel assembly is 80 dB.
The third amplifier 9 and the fourth amplifier 10 are both intermediate frequency amplifiers with frequency selection function, the third filter 12 is a low-pass filter, and the fifth amplifier 13 is an AGC amplifier.
The demodulation circuit comprises a demodulator 15, a fourth filter 17 and a rectifying device 18 which are connected in sequence, wherein the fourth filter 17 is a band-pass filter, and it can be known that the demodulation circuit only has one output.
In addition to the above-mentioned demodulation circuit, the demodulation circuit may further include a power divider 16, a plurality of fourth filters 17, a plurality of rectifying devices 18, and a plurality of gate switches 19, and the power divider 16, the fourth filters 17, the rectifying devices 18, and the gate switches 19 are sequentially connected to form a multi-output as shown in fig. 1.
Claims (6)
- The MB waveband receiving channel assembly is characterized by comprising a radio frequency receiving circuit, an AGC loop, a first filter and a demodulation circuit which are connected in sequence; wherein the content of the first and second substances,the radio frequency receiving circuit comprises a self-checking signal circuit, a signal preselection circuit, a single-pole double-throw switch, a first amplifier, a frequency mixer, a local oscillator signal circuit, a second filter and a second amplifier, wherein the output ends of the self-checking signal circuit and the signal preselection circuit are respectively connected with two fixed ends of the single-pole double-throw switch, the movable end of the single-pole double-throw switch, the first amplifier, the frequency mixer, the second filter and the second amplifier are sequentially connected, and the output end of the local oscillator signal circuit is connected to the frequency mixer;the self-checking signal circuit comprises a self-checking signal generator, the input end of the self-checking signal generator receives a self-checking enabling signal and/or a self-checking audio signal, and the output end of the self-checking signal generator is connected with the fixed end of the single-pole double-throw switch;the signal preselection circuit comprises an amplitude limiter and a preselection device which are connected in sequence;the AGC loop is used for processing the intermediate frequency signal output by the radio frequency receiving circuit;and the demodulation circuit demodulates the intermediate frequency signal processed by the AGC loop.
- 2. The MB band receive channel assembly of claim 1, wherein the first filter and the second filter are both intermediate frequency filters for filtering spurious interference caused by radio frequency signals and local oscillation signals, the first amplifier is a low noise amplifier, and the second amplifier is an intermediate frequency amplifier with frequency selection function.
- 3. The MB band receive channel assembly of claim 1, wherein the AGC loop comprises a third amplifier, a fourth amplifier, an envelope detector, a third filter and a fifth amplifier connected in series in a ring shape.
- 4. The MB band receive channel assembly of claim 3, wherein the third amplifier and the fourth amplifier are both intermediate frequency amplifiers with frequency selection function, the third filter is a low pass filter, and the fifth amplifier is an AGC amplifier.
- 5. The MB band receiving channel assembly of claim 1, wherein the demodulation circuit comprises a demodulator, a fourth filter and a rectifying device, which are connected in sequence, and the fourth filter is a band pass filter.
- 6. The MB band receive channel assembly of claim 5, wherein the demodulation circuit further comprises a power divider, a plurality of fourth filters, a plurality of rectifying devices and a plurality of gating switches, and wherein the power divider, the fourth filters, the rectifying devices and the gating switches are connected in sequence.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922276916.0U CN210431398U (en) | 2019-12-17 | 2019-12-17 | MB waveband receiving channel assembly |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922276916.0U CN210431398U (en) | 2019-12-17 | 2019-12-17 | MB waveband receiving channel assembly |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN210431398U true CN210431398U (en) | 2020-04-28 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201922276916.0U Active CN210431398U (en) | 2019-12-17 | 2019-12-17 | MB waveband receiving channel assembly |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN210431398U (en) |
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2019
- 2019-12-17 CN CN201922276916.0U patent/CN210431398U/en active Active
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