CN210274043U - A VUC receiving module - Google Patents
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- CN210274043U CN210274043U CN201921926687.6U CN201921926687U CN210274043U CN 210274043 U CN210274043 U CN 210274043U CN 201921926687 U CN201921926687 U CN 201921926687U CN 210274043 U CN210274043 U CN 210274043U
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Abstract
本实用新型公开了一种VUC接收模块，包括C波段接收通道、V波段接收通道和U波段接收通道，U波段接收通道和V波段接收通道均包括依次连接的预选通道、信号开关、低噪声放大通道、混频器、第一晶体滤波器、第一中频放大通道、第二晶体滤波器、第二中频放大通道和功分通道，信号开关还与自检信号连接，对接入低噪声放大通道的信号进行选择，混频器将低噪声放大通道输出的信号与本振信号混频后输出，信号经过变频放大输出中频信号。该接收模块能够接收C、V、U三种波段的射频信号，将信号变频为中频信号，同时进行滤波放大，以处理后的信号作为自检信号，具有自检功能，同时具有较好的邻道抑制和增益。
The utility model discloses a VUC receiving module, which comprises a C-band receiving channel, a V-band receiving channel and a U-band receiving channel. Both the U-band receiving channel and the V-band receiving channel include a pre-selection channel, a signal switch, a low-noise amplifier, which are connected in sequence. channel, mixer, first crystal filter, first IF amplification channel, second crystal filter, second IF amplification channel and power division channel, the signal switch is also connected with the self-test signal, and is connected to the low-noise amplification channel The mixer mixes the signal output by the low-noise amplifying channel with the local oscillator signal and outputs it, and the signal is amplified by frequency conversion to output an intermediate frequency signal. The receiving module can receive radio frequency signals of C, V and U bands, convert the signals into intermediate frequency signals, filter and amplify the signals at the same time, and use the processed signals as self-checking signals. Channel rejection and gain.
Description
Technical Field
The utility model belongs to the technical field of wireless communication equipment, specifically speaking relates to a VUC receiving module.
Background
In radio communication, which generally includes signal reception and signal transmission, it is known that a wide range of frequency bands can be used for communication, and C-band, U-band, and V-band are known as several frequency bands for wireless communication.
And the C wave band is a frequency band with the frequency of 4.0-8.0 GHz and is used as a frequency band of downlink transmission signals of the communication satellite. In satellite television broadcasting and various small satellite ground station applications, this frequency band was first adopted and has been widely used. The V/U band communication generally refers to communication of 30-3000 MHz, wherein 30-300 MHz is VHF (very high frequency), and 300-3000 MHz is UHF (ultra high frequency). The V/U band includes communication of a large number of professional services, such as fixed or mobile services of aviation navigation, satellite communication, broadcast television, transportation, public security, fire protection, and the like, and these communications are important for people's lives and properties and for social security and stability.
In the communication process, signal receiving and signal sending are usually included, in the signal receiving process, a radio frequency signal is converted into an intermediate frequency signal after being converted into a digital signal for processing, clutter and stray waves need to be suppressed in the signal frequency conversion process, and the integrity of the signal is guaranteed.
SUMMERY OF THE UTILITY MODEL
To foretell not enough among the prior art, the utility model provides a VUC receiving module, this receiving module include C wave band receiving channel, V wave band receiving channel and U wave band receiving channel, can receive C, V, U three kinds of wave band's radio frequency signal, become intermediate frequency signal with the signal frequency conversion, carry out filtering simultaneously and enlarge to the signal after handling is as the self-checking signal, has the self-checking function, has better adjacent channel suppression and gain simultaneously.
In order to achieve the above object, the utility model discloses a solution is: the utility model provides a VUCC receiving module, including C wave band receiving channel, V wave band receiving channel and U wave band receiving channel, U wave band receiving channel and V wave band receiving channel all include the preselection passageway that connects gradually, signal switch, the low noise amplification passageway, the mixer, first crystal filter, first intermediate frequency amplification passageway, second crystal filter, second intermediate frequency amplification passageway and merit divide the passageway, signal switch still is connected with the self-checking signal, select the signal that inserts the low noise amplification passageway, the mixer exports after mixing the signal of low noise amplification passageway output and local oscillator signal, the signal exports intermediate frequency signal through frequency conversion amplification. The first crystal filter is an eighth low-pass filter, and the input end of the eighth low-pass filter is connected with the output end of the frequency mixer to perform low-pass filtering on the frequency-mixed signal. The second crystal filter is a ninth low-pass filter, and the input end of the ninth low-pass filter is connected with the output end of the first intermediate-frequency amplification channel and is used for low-pass filtering of the signal after intermediate-frequency amplification. The highest gain of the chain circuit of the U-band receiving channel and the V-band receiving channel can reach 96dB, the output power can reach-3 dBm when-99 dBm is input, the adjacent channel suppression is realized by the crystal filter, the image frequency suppression is realized by the preselected channel, and the image frequency suppression is higher than-70 dB.
The C-band receiving channel comprises a first band-pass filter, and is used for accessing a radio frequency signal and performing band-pass filtering on the radio frequency signal; the first amplifier is connected with the output end of the first band-pass filter and used for amplifying the signal subjected to band-pass filtering; the first attenuator is connected with the output end of the first amplifier and is used for attenuating the amplified signal; the second amplifier is connected with the output end of the first attenuator and is used for amplifying the attenuated signals; the second band-pass filter is connected with the output end of the second amplifier and is used for performing band-pass filtering on the amplified signal; the first frequency mixer is used for mixing and outputting the signals subjected to band-pass filtering and the first local oscillator signals; the first numerical control attenuator is connected with the output end of the frequency mixer and is used for attenuating the frequency-mixed signal; the first low-pass filter is connected with the output end of the first numerical control attenuator and is used for low-pass filtering the attenuated signals; one end of the signal switch is connected with the output end of the first low-pass filter and is connected with the radio-frequency signal, and the other end of the signal switch is connected with the self-checking signal to select the radio-frequency signal and the self-checking signal; the third amplifier is connected with the output end of the signal switch and is used for amplifying the signal output by the signal switch; the second attenuator is connected with the output end of the third amplifier and is used for attenuating the amplified signal; the third band-pass filter is connected with the output end of the second attenuator and is used for carrying out band-pass filtering on the attenuated signals; the second digital control attenuator is connected with the output end of the third band-pass filter and is used for attenuating the signal after the band-pass filtering; the fourth amplifier is connected with the output end of the second digital control attenuator and is used for amplifying the attenuated signals; the third numerical control attenuator is connected with the output end of the fourth amplifier and is used for attenuating the amplified signal; the second low-pass filter is connected with the output end of the third numerical control attenuator and is used for low-pass filtering the attenuated signals; the third attenuator is connected with the output end of the second low-pass filter and is used for attenuating the signal subjected to low-pass filtering; the second frequency mixer is connected with the output end of the third attenuator, and is used for mixing the attenuated signal with a second local oscillator signal and outputting the mixed signal; the third low-pass filter is connected with the output end of the frequency mixer and used for low-pass filtering the frequency-mixed signal; the fourth band-pass filter is connected with the output end of the third low-pass filter and is used for carrying out band-pass filtering on the signal subjected to the low-pass filtering; the fifth amplifier is connected with the output end of the fourth band-pass filter and used for amplifying the signals subjected to band-pass filtering; the sixth amplifier is connected with the output end of the fifth amplifier and is used for amplifying the amplified signal again; the fourth low-pass filter is connected with the output end of the sixth amplifier and is used for low-pass filtering the amplified signal; the seventh amplifier is connected with the output end of the fourth low-pass filter and used for amplifying the low-pass filtered signal; the fifth band-pass filter is connected with the output end of the seventh amplifier and is used for carrying out band-pass filtering on the amplified signal; the eighth amplifier is connected with the output end of the fifth band-pass filter and used for amplifying the signals subjected to band-pass filtering; the first power divider is connected with the output end of the eighth amplifier and is used for dividing the amplified signals into two paths of signals; the fifth low-pass filter is connected with one output of the power divider and used for low-pass filtering of the signal; the second power divider is connected with the output end of the fifth low-pass filter and is used for dividing the signal into two paths of signals; and the sixth low-pass filter and the seventh low-pass filter are respectively connected with one output end of the second power divider, and output after low-pass filtering the signal subjected to power division, and the output of the sixth low-pass filter and the seventh low-pass filter is used as the intermediate frequency output of the C-band receiving channel. The attenuation range of the second numerical control attenuator and the third numerical control attenuator is 30 dB. The third low-pass filter is a crystal filter. The crystal filter after the second-stage frequency mixing can carry out adjacent channel suppression, reduce adjacent channel crosstalk, and has a wide attenuation range.
The C-band receiving channel further comprises a detector, the other output end of the first power divider is connected with the input end of the detector, signals are input into the detector as detection signals, and the output end of the detector is connected with the control ends of the first numerical control attenuator, the second numerical control attenuator, the sixth amplifier and the seventh amplifier respectively. The sixth amplifier and the seventh amplifier are numerical control amplifiers, and AGC is realized by cascading an intermediate-frequency second-stage numerical control attenuator and a second-stage numerical control amplifier. The step of the intermediate frequency numerical control attenuator of each stage is 1dB, the maximum attenuation value is 31.5dB, and the maximum attenuation value of the numerical control amplifier of each stage is 42.5 dB. After the cascade connection, the maximum attenuation range can reach 161 dB. The C-band receiving channel also comprises a self-detection signal mixer which is used for mixing the self-detection signal with the basic power signal and then connecting the self-detection signal and the basic power signal into the signal switch. The self-checking circuit can generate a self-checking signal and detect an output signal, and can realize self-checking signal modulation.
The pre-selection channel comprises a sixth band-pass filter, is connected with the radio frequency interface, accesses the radio frequency signal and performs band-pass filtering on the signal; the first low-noise amplifier is connected with the output end of the sixth band-pass filter and used for carrying out low-noise amplification on the signals subjected to band-pass filtering; the fourth attenuator is connected with the output end of the first low-noise amplifier and is used for attenuating the signal amplified by the low noise; the second low-noise amplifier is connected with the output end of the fourth attenuator and is used for carrying out low-noise amplification on the attenuated signals; the seventh band-pass filter is connected with the output end of the second low-noise amplifier, and is used for performing band-pass filtering on the signal amplified by the low noise, the output end of the seventh band-pass filter of the U-band receiving channel is connected with one end of the signal switch, the output end of the seventh band-pass filter of the V-band receiving channel is also connected with the fifth attenuator, the fifth attenuator is used for attenuating the signal after the band-pass filtering, the output end of the fifth attenuator is connected with the ninth amplifier, the ninth amplifier is used for amplifying the signal after the attenuation, the output end of the ninth amplifier is connected with the sixth attenuator and is used for attenuating the signal after the amplification, and the output end of the sixth attenuator is connected with one end of the signal switch.
The low-noise amplification channel comprises a fourth numerical control attenuator which is connected with one end of the signal switch and is used for attenuating the signal output by the signal switch; the tenth amplifier is connected with the output end of the fourth numerical control attenuator and is used for amplifying the attenuated signals; the fifth numerical control attenuator is connected with the output end of the tenth amplifier and is used for attenuating the amplified signal; the eighth low-pass filter is connected with the output end of the fifth numerical control attenuator and is used for performing low-pass filtering on the attenuated signals; and the seventh attenuator is connected with the output end of the eighth low-pass filter and is used for attenuating the signal subjected to low-pass filtering, and the output end of the seventh attenuator is connected with the radio-frequency signal input end of the mixer.
The first intermediate frequency amplification channel comprises an eighth band-pass filter, is connected with the output end of the eighth low-pass filter and is used for performing band-pass filtering on signals; the eighth attenuator is connected with the output end of the eighth band-pass filter and is used for attenuating signals; the eleventh amplifier is connected with the output end of the eighth attenuator and amplifies the signal; and a twelfth amplifier connected to an output terminal of the eleventh amplifier, and configured to amplify the signal again, wherein an output terminal of the twelfth amplifier is connected to the second crystal filter.
The second intermediate frequency amplification channel comprises a thirteenth amplifier, and the input end of the thirteenth amplifier is connected with the output end of the ninth low-pass filter and used for amplifying signals; the ninth attenuator is connected with the output end of the thirteenth amplifier and used for attenuating signals; the ninth band-pass filter is connected with the output end of the ninth attenuator and is used for carrying out band-pass filtering on the signal; the tenth attenuator is connected with the output end of the ninth band-pass filter and is used for attenuating signals; and the fourteenth amplifier is connected with the output end of the tenth attenuator and used for amplifying the signal, and the output end of the fourteenth amplifier is connected with the input end of the power dividing channel.
The power dividing channel comprises a third power divider which is connected with the output end of the second intermediate frequency amplification channel and divides the amplified signal into two paths of signals; the tenth low-pass filter is connected with one output of the third power divider and used for low-pass filtering the signal; the fourth power divider is connected with the output end of the tenth low-pass filter and is used for dividing the signal into two paths of signals; the eleventh low-pass filter and the twelfth low-pass filter are respectively connected with one output end of the fourth power divider, the signals subjected to power division are output after low-pass filtering, the output of the eleventh low-pass filter and the twelfth low-pass filter is used as the intermediate frequency output of a U/V wave band receiving channel, the other path of signals of the third power divider are used as detection signals and transmitted to an AGC control panel, so that the channel has a self-checking function, the AGC control panel adopts an FPGA control panel, the FPGA control panel realizes the control of the fourth numerical control attenuator, the fifth numerical control attenuator, the twelfth amplifier and the thirteenth amplifier, the FPGA adopts an FPGA which can realize the control of the numerical control attenuator and the numerical control amplifier in the existing communication system, and the FPGA is mainly used for controlling the attenuation of the numerical control attenuator and the amplification power of the numerical control amplifier.
The C-band receiving channel also comprises an amplitude limiter, and the amplitude limiter is connected with the output end of the first band-pass filter and is used for limiting the amplitude of an input signal; the preselection channel also comprises an amplitude limiter, and the amplitude limiter is connected with the radio frequency interface and used for limiting the amplitude of the input signal.
The utility model has the advantages that:
(1) the receiving module comprises a C-waveband receiving channel, a V-waveband receiving channel and a U-waveband receiving channel, can receive C, V, U radio frequency signals with three wavebands, converts the signals into intermediate frequency signals, and simultaneously performs filtering amplification, takes the processed signals as self-detection signals, has a self-detection function, and simultaneously has good adjacent channel inhibition and gain.
Drawings
Fig. 1 is a block diagram of a VUC receiving module of the present invention;
FIG. 2 is a block diagram of the U/V band receiving channel of the present invention;
FIG. 3 is a schematic diagram of a U/V band receive channel;
fig. 4 illustrates the C-band receive channel principle.
Detailed Description
The invention is further described below with reference to the accompanying drawings:
as shown in fig. 1 to 4, a VUC receiving module includes a C-band receiving channel, a V-band receiving channel, and a U-band receiving channel, where the U-band receiving channel and the V-band receiving channel include a preselection channel, a signal switch, a low-noise amplification channel, a mixer, a first crystal filter, a first intermediate-frequency amplification channel, a second crystal filter, a second intermediate-frequency amplification channel, and a power division channel, which are connected in sequence, the signal switch is further connected to a self-checking signal, selects a signal accessed to the low-noise amplification channel, the mixer mixes a signal output by the low-noise amplification channel with a local oscillator signal and outputs the mixed signal, and the signal is amplified by frequency conversion to output an intermediate-frequency signal. The first crystal filter is an eighth low-pass filter, and the input end of the eighth low-pass filter is connected with the output end of the frequency mixer to perform low-pass filtering on the frequency-mixed signal. The second crystal filter is a ninth low-pass filter, and the input end of the ninth low-pass filter is connected with the output end of the first intermediate-frequency amplification channel and is used for low-pass filtering of the signal after intermediate-frequency amplification. The highest gain of the chain circuit of the U-band receiving channel and the V-band receiving channel can reach 96dB, the output power can reach-3 dBm when-99 dBm is input, the adjacent channel suppression is realized by the crystal filter, the image frequency suppression is realized by the preselected channel, and the image frequency suppression is higher than-70 dB.
The C-band receiving channel comprises a first band-pass filter, and is used for accessing a radio frequency signal and performing band-pass filtering on the radio frequency signal; the first amplifier is connected with the output end of the first band-pass filter and used for amplifying the signal subjected to band-pass filtering; the first attenuator is connected with the output end of the first amplifier and is used for attenuating the amplified signal; the second amplifier is connected with the output end of the first attenuator and is used for amplifying the attenuated signals; the second band-pass filter is connected with the output end of the second amplifier and is used for performing band-pass filtering on the amplified signal; the first frequency mixer is used for mixing and outputting the signals subjected to band-pass filtering and the first local oscillator signals; the first numerical control attenuator is connected with the output end of the frequency mixer and is used for attenuating the frequency-mixed signal; the first low-pass filter is connected with the output end of the first numerical control attenuator and is used for low-pass filtering the attenuated signals; one end of the signal switch is connected with the output end of the first low-pass filter and is connected with the radio-frequency signal, and the other end of the signal switch is connected with the self-checking signal to select the radio-frequency signal and the self-checking signal; the third amplifier is connected with the output end of the signal switch and is used for amplifying the signal output by the signal switch; the second attenuator is connected with the output end of the third amplifier and is used for attenuating the amplified signal; the third band-pass filter is connected with the output end of the second attenuator and is used for carrying out band-pass filtering on the attenuated signals; the second digital control attenuator is connected with the output end of the third band-pass filter and is used for attenuating the signal after the band-pass filtering; the fourth amplifier is connected with the output end of the second digital control attenuator and is used for amplifying the attenuated signals; the third numerical control attenuator is connected with the output end of the fourth amplifier and is used for attenuating the amplified signal; the second low-pass filter is connected with the output end of the third numerical control attenuator and is used for low-pass filtering the attenuated signals; the third attenuator is connected with the output end of the second low-pass filter and is used for attenuating the signal subjected to low-pass filtering; the second frequency mixer is connected with the output end of the third attenuator, and is used for mixing the attenuated signal with a second local oscillator signal and outputting the mixed signal; the third low-pass filter is connected with the output end of the frequency mixer and used for low-pass filtering the frequency-mixed signal; the fourth band-pass filter is connected with the output end of the third low-pass filter and is used for carrying out band-pass filtering on the signal subjected to the low-pass filtering; the fifth amplifier is connected with the output end of the fourth band-pass filter and used for amplifying the signals subjected to band-pass filtering; the sixth amplifier is connected with the output end of the fifth amplifier and is used for amplifying the amplified signal again; the fourth low-pass filter is connected with the output end of the sixth amplifier and is used for low-pass filtering the amplified signal; the seventh amplifier is connected with the output end of the fourth low-pass filter and used for amplifying the low-pass filtered signal; the fifth band-pass filter is connected with the output end of the seventh amplifier and is used for carrying out band-pass filtering on the amplified signal; the eighth amplifier is connected with the output end of the fifth band-pass filter and used for amplifying the signals subjected to band-pass filtering; the first power divider is connected with the output end of the eighth amplifier and is used for dividing the amplified signals into two paths of signals; the fifth low-pass filter is connected with one output of the power divider and used for low-pass filtering of the signal; the second power divider is connected with the output end of the fifth low-pass filter and is used for dividing the signal into two paths of signals; and the sixth low-pass filter and the seventh low-pass filter are respectively connected with one output end of the second power divider, and output after low-pass filtering the signal subjected to power division, and the output of the sixth low-pass filter and the seventh low-pass filter is used as the intermediate frequency output of the C-band receiving channel. The attenuation range of the second numerical control attenuator and the third numerical control attenuator is 30 dB. The third low-pass filter is a crystal filter. The crystal filter after the second-stage frequency mixing can carry out adjacent channel suppression, reduce adjacent channel crosstalk, and has a wide attenuation range.
The C-band receiving channel further comprises a detector, the other output end of the first power divider is connected with the input end of the detector, signals are input into the detector as detection signals, and the output end of the detector is connected with the control ends of the first numerical control attenuator, the second numerical control attenuator, the sixth amplifier and the seventh amplifier respectively. The sixth amplifier and the seventh amplifier are numerical control amplifiers, and AGC is realized by cascading an intermediate-frequency second-stage numerical control attenuator and a second-stage numerical control amplifier. The step of the intermediate frequency numerical control attenuator of each stage is 1dB, the maximum attenuation value is 31.5dB, and the maximum attenuation value of the numerical control amplifier of each stage is 42.5 dB. After the cascade connection, the maximum attenuation range can reach 161 dB. The C-band receiving channel also comprises a self-detection signal mixer which is used for mixing the self-detection signal with the basic power signal and then connecting the self-detection signal and the basic power signal into the signal switch. The self-checking circuit can generate a self-checking signal and detect an output signal, and can realize self-checking signal modulation.
The pre-selection channel comprises a sixth band-pass filter, is connected with the radio frequency interface, accesses the radio frequency signal and performs band-pass filtering on the signal; the first low-noise amplifier is connected with the output end of the sixth band-pass filter and used for carrying out low-noise amplification on the signals subjected to band-pass filtering; the fourth attenuator is connected with the output end of the first low-noise amplifier and is used for attenuating the signal amplified by the low noise; the second low-noise amplifier is connected with the output end of the fourth attenuator and is used for carrying out low-noise amplification on the attenuated signals; the seventh band-pass filter is connected with the output end of the second low-noise amplifier, and is used for performing band-pass filtering on the signal amplified by the low noise, the output end of the seventh band-pass filter of the U-band receiving channel is connected with one end of the signal switch, the output end of the seventh band-pass filter of the V-band receiving channel is also connected with the fifth attenuator, the fifth attenuator is used for attenuating the signal after the band-pass filtering, the output end of the fifth attenuator is connected with the ninth amplifier, the ninth amplifier is used for amplifying the signal after the attenuation, the output end of the ninth amplifier is connected with the sixth attenuator and is used for attenuating the signal after the amplification, and the output end of the sixth attenuator is connected with one end of the signal switch.
The low-noise amplification channel comprises a fourth numerical control attenuator which is connected with one end of the signal switch and is used for attenuating the signal output by the signal switch; the tenth amplifier is connected with the output end of the fourth numerical control attenuator and is used for amplifying the attenuated signals; the fifth numerical control attenuator is connected with the output end of the tenth amplifier and is used for attenuating the amplified signal; the eighth low-pass filter is connected with the output end of the fifth numerical control attenuator and is used for performing low-pass filtering on the attenuated signals; and the seventh attenuator is connected with the output end of the eighth low-pass filter and is used for attenuating the signal subjected to low-pass filtering, and the output end of the seventh attenuator is connected with the radio-frequency signal input end of the mixer.
The first intermediate frequency amplification channel comprises an eighth band-pass filter, is connected with the output end of the eighth low-pass filter and is used for performing band-pass filtering on signals; the eighth attenuator is connected with the output end of the eighth band-pass filter and is used for attenuating signals; the eleventh amplifier is connected with the output end of the eighth attenuator and amplifies the signal; and a twelfth amplifier connected to an output terminal of the eleventh amplifier, and configured to amplify the signal again, wherein an output terminal of the twelfth amplifier is connected to the second crystal filter.
The second intermediate frequency amplification channel comprises a thirteenth amplifier, and the input end of the thirteenth amplifier is connected with the output end of the ninth low-pass filter and used for amplifying signals; the ninth attenuator is connected with the output end of the thirteenth amplifier and used for attenuating signals; the ninth band-pass filter is connected with the output end of the ninth attenuator and is used for carrying out band-pass filtering on the signal; the tenth attenuator is connected with the output end of the ninth band-pass filter and is used for attenuating signals; and the fourteenth amplifier is connected with the output end of the tenth attenuator and used for amplifying the signal, and the output end of the fourteenth amplifier is connected with the input end of the power dividing channel.
The power dividing channel comprises a third power divider which is connected with the output end of the second intermediate frequency amplification channel and divides the amplified signal into two paths of signals; the tenth low-pass filter is connected with one output of the third power divider and used for low-pass filtering the signal; the fourth power divider is connected with the output end of the tenth low-pass filter and is used for dividing the signal into two paths of signals; the eleventh low-pass filter and the twelfth low-pass filter are respectively connected with one output end of the fourth power divider, the signals subjected to power division are output after low-pass filtering, the output of the eleventh low-pass filter and the twelfth low-pass filter is used as the intermediate frequency output of a U/V wave band receiving channel, the other path of signals of the third power divider are used as detection signals and transmitted to an AGC control panel, so that the channel has a self-checking function, the AGC control panel adopts an FPGA control panel, the FPGA control panel realizes the control of the fourth numerical control attenuator, the fifth numerical control attenuator, the twelfth amplifier and the thirteenth amplifier, the FPGA adopts an FPGA which can realize the control of the numerical control attenuator and the numerical control amplifier in the existing communication system, and the FPGA is mainly used for controlling the attenuation of the numerical control attenuator and the amplification power of the numerical control amplifier. AGC is realized by cascading an intermediate-frequency two-stage numerical control attenuator and a two-stage numerical control amplifier. The step of the intermediate frequency numerical control attenuator of each stage is 1dB, the maximum attenuation value is 31.5dB, and the maximum attenuation value of the numerical control amplifier of each stage is 42.5 dB. After the cascade connection, the maximum attenuation range can reach 161 dB.
The C-band receiving channel also comprises an amplitude limiter, and the amplitude limiter is connected with the output end of the first band-pass filter and is used for limiting the amplitude of an input signal; the preselection channel also comprises an amplitude limiter, and the amplitude limiter is connected with the radio frequency interface and used for limiting the amplitude of the input signal.
Under the combined action of a corresponding filter and local oscillator frequency, the receiving channel has no low-order intermodulation stray in the band, the local oscillator stray suppression is more than or equal to 60dBc, the isolation of the frequency mixer is more than 25dBc, and the local oscillator leakage stray is low.
The above-mentioned embodiments only express the specific embodiments of the present invention, and the description thereof is specific and detailed, but not construed as limiting the scope of the present invention. It should be noted that, for those skilled in the art, without departing from the spirit of the present invention, several variations and modifications can be made, which are within the scope of the present invention.
Claims (10)
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921926687.6U CN210274043U (en) | 2019-11-08 | 2019-11-08 | A VUC receiving module |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201921926687.6U CN210274043U (en) | 2019-11-08 | 2019-11-08 | A VUC receiving module |
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| CN210274043U true CN210274043U (en) | 2020-04-07 |
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