CN114826294A - Modular large dynamic high-speed channel conversion device and method - Google Patents
Modular large dynamic high-speed channel conversion device and method Download PDFInfo
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Abstract
The invention discloses a modular large dynamic high-speed channel conversion device and a method, wherein the device comprises modules 1-3; in the module 1, a microwave signal is input into a two-channel sub-network consisting of two single-pole two-switch switches to form two working modes of a low-noise path and a straight-through path, a lower link is a six-channel preselection switch filter bank, a preselection output channel signal is subjected to low-noise amplification and then is subjected to frequency mixing with a first local oscillator to obtain a first intermediate frequency, and then is subjected to frequency mixing with a second local oscillator to obtain a second intermediate frequency; in the module 2, the second intermediate frequency and a third local oscillator are subjected to frequency mixing to obtain a third intermediate frequency, and finally, the third intermediate frequency is divided into two paths of signals with equal amplitude and same phase and output; the module 1 is an independent sealing unit, the module 2 is installed on a track plug box by adopting an electric fitting process, and the module 3 is an independent control panel unit and used for controlling and supplying power between modules. The invention has the advantages of large dynamic measurement range, low noise coefficient, high mode channel switching speed, high integration level and strong universality.
Description
Technical Field
The invention relates to the technical field of electronic reconnaissance and electronic countermeasure, in particular to a modular large dynamic high-speed channel conversion device and a method.
Background
Various channel conversion schemes in broadband receivers of electronic reconnaissance and electronic countermeasure systems are relatively mature, and the main functions of channel conversion products are as follows: 1) as a scout frequency measurement receiving component, carrying out mode and channelization preselection on a received microwave signal; 2) as a frequency conversion component, the microwave signal pre-selected by channelization is frequency-converted a plurality of times to an intermediate frequency signal required by a signal processor. The main indicators describing the properties of such products are: 1) a noise factor; 2) gain; 3) flatness in the band; 4) inputting a second-order intercept point; 5) inputting a third-order intercept point; 6) intermediate frequency suppression; 7) image frequency suppression; 8) instantaneous dynamic range; 9) measuring a dynamic range; 10) mode channel switching time.
However, the conventional channel conversion scheme is usually a split design, and has the problems of complex radio frequency and control interconnection relationship among components, low reliability, small measurement dynamic range, high noise coefficient, low mode channel switching speed, poor image rejection capability, low integration level and the like.
Disclosure of Invention
The invention aims to provide a modularized generalized microwave channel conversion device and a method, which have the advantages of large measurement dynamic range, low noise coefficient, high mode channel switching speed, good image rejection capability, high integration level, standard size and the like.
The technical solution for realizing the purpose of the invention is as follows: the utility model provides a big dynamic high-speed channel conversion equipment of modularization, includes module 1, module 2, module 3, wherein:
the module 1 comprises a low-noise amplification/direct connection dual-mode switching front-end circuit module, a preselection switch filter bank circuit module, a two-stage frequency conversion circuit module and a local oscillator Lo3 circuit module which are sequentially arranged step by step; the low-noise amplifier/direct-connection dual-mode switching front-end circuit module comprises a dual-channel sub-network consisting of two single-pole two-switch switches, wherein the dual-channel sub-network forms two working modes of a low-noise link and a direct-connection link, and the low-noise link consists of two continuous stages of low-noise amplifiers and a temperature compensation attenuator; the preselection switch filter bank circuit module adopts a single-pole four-switch and single-pole three-switch combined division form, a first three-channel and a second three-channel of a high frequency band adopt single-pole four-direct-pass, a fourth three-channel and a fifth three-channel of a low frequency band adopt cascade single-pole three-channels, and a low-pass filter is used for filtering out high-order clutter; the two-stage frequency conversion circuit module comprises a first frequency mixer, a single-pole two-switch filter bank and a second frequency mixer which are sequentially arranged, wherein the first frequency mixer receives a channel signal which is output in a preselected mode and is subjected to low-noise amplification processing, then performs first frequency conversion with a local oscillator Lo1, and outputs an intermediate frequency signal IF 1; the intermediate frequency signal IF1 passes through a single-pole two-switch filter bank to obtain an intermediate frequency signal IF11 and an intermediate frequency signal IF 12; the intermediate frequency signal IF11 and the intermediate frequency signal IF12 are input into a second mixer to perform second frequency conversion with a local oscillator Lo2, and an intermediate frequency signal IF2 is obtained;
the module 2 comprises a first-stage frequency conversion circuit module, an intermediate frequency amplification filter circuit module, a numerical control attenuation circuit module, two switch filter banks, a differential amplifier and a final-stage power divider; the first-stage frequency conversion circuit module comprises a third mixer, the intermediate frequency signal IF2 is subjected to low-pass filtering, numerical control attenuation and power amplification, and then is output as a dot frequency signal through a band-pass filter, and the dot frequency signal and the local oscillator Lo3 output by the local oscillator Lo3 circuit module are subjected to third frequency conversion through the third mixer to obtain an intermediate frequency signal IF 3; the intermediate frequency amplifying and filtering circuit module comprises a two-stage low-pass filter, a two-stage amplifier and an IF3 band-pass filter with the bandwidth of 20 MHz; the numerical control attenuation circuit module comprises two stages of numerical control attenuators; the two-way switch filter bank adopts a single-pole two-switch bank to generate two-way signals, one way is a through way, and the other way is a filtering signal with the bandwidth of 200 KHz; the intermediate frequency signal IF3 passes through a two-stage low-pass filter, a two-stage amplifier, a two-stage numerical control attenuator, a band-pass filter, a single-pole two-switch group, a high-gain differential amplifier and a final-stage power divider, and finally the intermediate frequency signal IF3 is divided into two paths of signals with equal amplitude and same phase for output;
the module 3 is an independent control panel unit and is used for controlling and supplying power between the module 1 and the module 2, and the module 3 is integrated with a differential single-ended high-speed communication conversion circuit and is connected with the CPCIe board card in a compression joint mode.
A modular large dynamic high-speed channel conversion method is based on the modular large dynamic high-speed channel conversion device and comprises the following specific steps:
microwave signals received by a detection antenna are input into a dual-channel sub-network consisting of two single-pole two-switch switches to form two working modes of a low-noise circuit and a straight-through circuit, wherein the low-noise circuit consists of two continuous stages of low-noise amplifiers and a temperature compensation attenuator;
the lower link of the dual-channel sub-network is provided with a six-channel pre-selection switch filter bank, and the first, second and third channel link devices of the high frequency band are sequentially as follows: the single-pole four-switch input circuit comprises a single-pole four-switch input circuit, a cavity filter, a single-pole single switch and a single-pole four-switch output circuit; the low-frequency-band four-channel, five-channel and six-channel link devices are sequentially as follows: the device comprises a single-pole four-switch input, a single-pole three-switch, a cavity filter, a single-pole three-switch, a low-pass filter and a single-pole four-switch output;
after low-noise amplification, the preselecting output channel signal is subjected to first frequency conversion with a sweep frequency source local oscillator Lo1, an intermediate frequency signal IF1 is output, and the intermediate frequency signal IF1 is subjected to a single-pole two-switch filter bank to obtain an intermediate frequency signal IF11 and an intermediate frequency signal IF 12; respectively performing second frequency conversion on the intermediate frequency signal IF11 and the intermediate frequency signal IF12 and the sweep frequency local oscillator Lo2 to obtain an intermediate frequency signal IF 2;
after low-pass filtering, numerical control attenuation and power amplification are carried out on the intermediate frequency signal IF2, a dot frequency signal is output through a band-pass filter, and the dot frequency signal and a local oscillator Lo3 output by a local oscillator Lo3 circuit module are subjected to third frequency conversion through a third mixer to obtain an intermediate frequency signal IF 3;
the intermediate frequency signal IF3 passes through a two-stage low-pass filter, a two-stage amplifier, a two-stage numerical control attenuator, a band-pass filter, a single-pole two-switch group, a high-gain differential amplifier and a final-stage power divider, and finally the intermediate frequency signal IF3 is divided into two paths of signals with equal amplitude and same phase for output.
Compared with the prior art, the invention has the following remarkable advantages:
1) the invention adopts a standard track jack-box type modular design, the whole device can be divided into 3 modules, and the signal transmission between the module 1 and the module 2 only adopts horizontal transition insulator pins for interconnection; the module 3 is an independent control panel unit and is integrated with a differential single-ended high-speed communication conversion circuit; the control and power supply among the module 3, the module 1 and the module 2 are interconnected only by adopting a J30JM1-31ZKSY-Q6 connector, all signal I/O and control interfaces are distributed on one side of the plug box, and CPCIe board card plug interfaces are adopted externally, so that the modular integration is easy;
2) the module 1 adopts a micro-assembly process and is sealed into a high-reliability independent component by laser seal welding; the module integrates a low-noise amplification/direct connection dual-mode switching front-end circuit module, a pre-selection switch filter bank circuit module and a two-stage frequency conversion circuit module. The double-mode switch and the channel change-over switch both adopt gallium arsenide MMIC electronic switches within 80ns, so that the high-speed performance of the device is ensured;
3) the module 2 adopts an electric fitting process and integrates a first-stage frequency conversion circuit module, an intermediate frequency amplification filter circuit module, a numerical control attenuation circuit module and other functional circuit modules; the small step numerical control attenuator can provide a gain leveling function for each channel in the module 1, and the two-stage large step numerical control attenuator is combined with the dual-mode switching in the module 1 to provide a measurement dynamic range adjusting function, so that the large dynamic performance of the device is ensured;
4) the microwave component can convert the F1-F2 ultra-wideband microwave signals received by the antenna into intermediate-frequency signals with IF (intermediate frequency) center frequencies for many times, has the advantages of large measurement dynamic range, low noise coefficient, good image rejection capability and high mode channel switching speed, and can be universally used for microwave components in electronic system equipment such as electronic reconnaissance and electronic countermeasure.
Drawings
Fig. 1 is a basic schematic block diagram of a device circuit.
Fig. 2 is a schematic block diagram of the circuit design of module 1.
Fig. 3 is a schematic block diagram of the circuit design of module 2.
Fig. 4 is a circuit layout diagram of the modules 1, 2, 3.
Detailed Description
The invention relates to a modularized large dynamic high-speed channel conversion device, which comprises a module 1, a module 2 and a module 3, wherein:
the module 1 comprises a low-noise amplifier/direct-connection dual-mode switching front-end circuit module, a preselection switch filter bank circuit module, a two-stage frequency conversion circuit module and a local oscillator Lo3 circuit module which are sequentially arranged stage by stage; the low-noise amplifier/direct-connection dual-mode switching front-end circuit module comprises a dual-channel sub-network consisting of two single-pole two-switch switches, wherein the dual-channel sub-network forms two working modes of a low-noise link and a direct-connection link, and the low-noise link consists of two continuous stages of low-noise amplifiers and a temperature compensation attenuator; the pre-selection switch filter group circuit module adopts a single-pole four-switch and single-pole three-switch combined division form, a first three-channel and a second three-channel of a high frequency band adopt single-pole four-direct-connection, a fourth three-channel and a fifth three-channel of a low frequency band adopt cascade single-pole three-channel, and a low-pass filter is used for filtering out higher clutter; the two-stage frequency conversion circuit module comprises a first frequency mixer, a single-pole two-switch filter bank and a second frequency mixer which are sequentially arranged, wherein the first frequency mixer receives a channel signal which is output in a preselected mode and is subjected to low-noise amplification processing, then performs first frequency conversion with a local oscillator Lo1, and outputs an intermediate frequency signal IF 1; the intermediate frequency signal IF1 passes through a single-pole two-switch filter bank to obtain an intermediate frequency signal IF11 and an intermediate frequency signal IF 12; the intermediate frequency signal IF11 and the intermediate frequency signal IF12 are input into a second mixer to perform second frequency conversion with a local oscillator Lo2, and an intermediate frequency signal IF2 is obtained;
the module 2 comprises a first-stage frequency conversion circuit module, an intermediate frequency amplification filter circuit module, a numerical control attenuation circuit module, two switch filter banks, a differential amplifier and a final-stage power divider; the first-stage frequency conversion circuit module comprises a third mixer, the intermediate frequency signal IF2 is subjected to low-pass filtering, numerical control attenuation and power amplification, and then is output as a dot frequency signal through a band-pass filter, and the dot frequency signal and the local oscillator Lo3 output by the local oscillator Lo3 circuit module are subjected to third frequency conversion through the third mixer to obtain an intermediate frequency signal IF 3; the intermediate frequency amplifying and filtering circuit module comprises a two-stage low-pass filter, a two-stage amplifier and an IF3 band-pass filter with the bandwidth of 20 MHz; the numerical control attenuation circuit module comprises two stages of numerical control attenuators; the two-way switch filter bank adopts a single-pole two-switch bank to generate two-way signals, one way is a through way, and the other way is a filtering signal with the bandwidth of 200 KHz; the intermediate frequency signal IF3 passes through a two-stage low-pass filter, a two-stage amplifier, a two-stage numerical control attenuator, a band-pass filter, a single-pole two-switch group, a high-gain differential amplifier and a final-stage power divider, and finally the intermediate frequency signal IF3 is divided into two paths of signals with equal amplitude and same phase for output;
the module 3 is an independent control panel unit and is used for controlling and supplying power between the module 1 and the module 2, and the module 3 is integrated with a differential single-ended high-speed communication conversion circuit and is connected with the CPCIe board card in a compression joint mode.
As a specific example, the module 1 is an independent sealing unit, the assembly is realized by adopting a micro-assembly process, and the airtight waterproof sealing is realized by laser seal welding a cover plate; the module 2 adopts a Rogers 4350 plate substrate, is assembled by an electric fitting process, is directly installed in the track insert box, and is subjected to three-proofing treatment by using three-proofing paint; the control and power supply among the module 3, the module 1 and the module 2 are interconnected by adopting a J30JM1-31ZKSY-Q6 connector, the local oscillation transition between the module 1 and the module 2 is interconnected by adopting an SMA cable, and the terminal signal output is interconnected by adopting an insulator pin bridge.
As a specific example, the low-noise amplifier/pass-through dual-mode switching front-end circuit module includes a first single-pole two-switch, a first amplifier, a second amplifier, a first temperature compensation attenuator, and a second single-pole two-switch, where one output of the first single-pole two-switch is sequentially connected to one input of the second single-pole two-switch, and the first amplifier, the second amplifier, and the first temperature compensation attenuator are connected to one input of the second single-pole two-switch, and the other output of the first single-pole two-switch is connected to the other input of the second single-pole two-switch by a direct path.
As a specific example, the preselection switch filter bank circuit module includes a first single-pole four-switch, a second single-pole four-switch, and a six-channel preselection switch filter bank disposed therebetween;
the connection sequence of the first, second and third channel link devices of the high frequency band is as follows: the first output end of the first single-pole four-switch is connected with the first filter and the first single-pole single switch in sequence and then is connected with the first input end of the second single-pole four-switch; the second output end of the first single-pole four-switch is connected with the second filter and the second single-pole four-switch in sequence and then is connected with the second input end of the second single-pole four-switch; a third output end of the first single-pole four-switch is sequentially connected with a third filter and a third single-pole single switch and then is connected with a third input end of the second single-pole four-switch;
the connection sequence of the fourth, fifth and sixth channel link devices of the low frequency band is as follows: a fourth output end of the first single-pole four switch is connected with a first single-pole three switch, a first output end of the first single-pole three switch is connected with a first input end of a second single-pole three switch through a fourth filter, a second output end of the first single-pole three switch is connected with a second input end of the second single-pole three switch through a fifth filter, a third output end of the first single-pole three switch is connected with a third input end of the second single-pole three switch through a sixth filter, and an output end of the second single-pole three switch is connected with a fourth input end of the second single-pole four switch through a seventh filter;
the output end of the second single-pole four-switch is connected with the two-stage frequency conversion circuit module.
As a specific example, the two-stage frequency conversion circuit module comprises a first mixer, a single-pole two-switch filter bank and a second mixer which are arranged in sequence; the output signal of the pre-selection switch filtering group circuit module is connected with a third amplifier and a first equalizer in sequence and then is connected to one input end of a first frequency mixer, a local oscillator Lo1 is connected with a fourth amplifier and a first attenuator in sequence and then is connected to the other input end of the first frequency mixer, and the output end of the first frequency mixer outputs an intermediate frequency signal IF 1;
the single-pole two-switch filter bank comprises a third single-pole two switch and a fourth single-pole two switch, the input end of the third single-pole two switch is connected with the output end of the first frequency mixer, the first output end of the third single-pole two switch is connected with the fourth single-pole single switch, the eighth filter and the sixth single-pole single switch in sequence and then is connected with the first input end of the fourth single-pole two switch, and the second output end of the third single-pole two switch is connected with the fifth single-pole single switch, the ninth filter and the seventh single-pole single switch in sequence and then is connected with the second input end of the fourth single-pole two switch; the output end of the fourth single-pole two-switch is connected to one input end of the second frequency mixer; the local oscillator Lo2 is sequentially connected to the fifth amplifier and the second attenuator and then connected to the other input terminal of the second mixer, and the output terminal of the second mixer outputs the intermediate frequency signal IF 2.
As a specific example, the local oscillator Lo3 circuit module includes a seventh amplifier, a twelfth filter, and a third attenuator, which are connected in sequence, where the local oscillator Lo3 inputs the seventh amplifier, and an output end of the third attenuator is connected to one input end of the third mixer.
As a specific example, the module 2 includes a first-stage frequency conversion circuit module, an intermediate frequency amplification filter circuit module, a digital control attenuation circuit module, two switch filter banks, a differential amplifier, and a final power divider, specifically as follows:
the output end of the second frequency mixer is connected with a tenth filter, a first numerical control attenuator, a sixth amplifier and an eleventh filter in sequence and then is connected to the other input end of the third frequency mixer; the output end of the third mixer is sequentially connected with a thirteenth filter, an eighth amplifier, a fourth attenuator, a second numerical control attenuator, a ninth amplifier, a fourteenth filter, a second temperature compensation attenuator, a third numerical control attenuator, a fifteenth filter and a third temperature compensation attenuator and is connected to the input end of a fifth single-pole two-switch; one output end of the fifth single-pole two switch is connected with one input end of the sixth single-pole two switch through a crystal filter, the other output end of the fifth single-pole two switch is connected with the other input end of the sixth single-pole two switch through a fifth attenuator, the output end of the sixth single-pole two switch is connected with the first balun, the differential amplifier and the second balun in sequence and then is connected with the second power divider, and the second power divider outputs two paths of equal-amplitude and same-phase signals RFout1 and RFout 2.
As a specific example, the first to the second single-pole four switches adopt MA4SW410B, the first to the second single-pole switches are MASW-003102-13590, and the first to the third single-pole single switches select MA4AGSW 1; the first filter, the second filter, the third filter and the fourth filter are 6-channel division filters, and the frequency band covers F1-F2 ultra wide band working frequency bands which can be supported by the device; the seventh filter is a low pass filter for reducing the higher harmonics of the four, five and six channels.
As a specific example, the devices in the module 2 are specifically as follows:
the tenth filter is a low-pass filter and is used for filtering out high-order clutter;
the first numerical control attenuator is an HMC274QS16 large step attenuator, the step is 1dB, and the dynamic range is adjusted;
the sixth amplifier is MGA-82563 low noise amplifier used for gain compensation and noise suppression;
the eleventh filter is a customized band-pass filter with the bandwidth of 20MHz and is used for filtering out-of-band clutter of the intermediate frequency signal IF 2;
the eighth amplifier and the ninth amplifier are TQP3M9028, the fourth attenuator is used for adjusting the input power value of the ninth amplifier to ensure that the ninth amplifier works in a linear working state, and the second numerical control attenuator is an HMC470LP3 large step attenuator, the step is 1dB, and the dynamic range is adjusted;
the fourteenth filter is a customized band-pass filter with the bandwidth of 20MHz and is used for filtering out-of-band clutter of the intermediate frequency signal IF 3;
the second temperature compensation attenuator and the third temperature compensation attenuator are used for balancing high and low temperature gain fluctuation of the terminal output signal;
the fifteenth filter adopts a low-pass filter, the fourteenth filter adopts a band-pass filter, and the fifteenth filter is used as a supplement for the far-end clutter suppression of the fourteenth filter;
the third numerical control attenuator is a small step attenuator HMC792LP4E, the step is 0.25dB, and the functions are two: firstly, the gain fine adjustment is used for the whole microwave link; secondly, adjusting the gain difference value between different channels according to the channel frequency codes in each channel in the module 1, thereby ensuring that the flatness of a terminal output signal is within an index range in the whole F1-F2 ultra-wideband working frequency band;
the fifth single-pole second switch and the sixth single-pole second switch both adopt HMC336MS8G, a crystal filter is a customized 200KHz narrow-band filter, and the fifth attenuator is used for adjusting the insertion loss of a direct path and a filtering path; when a large signal is input, a straight path is selected, and when a small signal is input, a 200KHz narrow-band filter path is selected;
the differential amplifier is LT5514, and the first balun and the second balun are applied matching circuits of the differential amplifier.
The invention also provides a modular large dynamic high-speed channel conversion method, which is based on the modular large dynamic high-speed channel conversion device and comprises the following specific steps:
microwave signals received by a detection antenna are input into a dual-channel sub-network consisting of two single-pole two-switch switches to form two working modes of a low-noise circuit and a straight-through circuit, wherein the low-noise circuit consists of two continuous stages of low-noise amplifiers and a temperature compensation attenuator;
the lower link of the dual-channel sub-network is provided with a six-channel pre-selection switch filter bank, and the first, second and third channel link devices of the high frequency band are sequentially as follows: the single-pole four-switch input circuit comprises a single-pole four-switch input circuit, a cavity filter, a single-pole single switch and a single-pole four-switch output circuit; the low-frequency-band four-channel, five-channel and six-channel link devices are sequentially as follows: the device comprises a single-knife four-switch input, a single-knife three-switch, a cavity filter, a single-knife three-switch, a low-pass filter and a single-knife four-switch output;
after low-noise amplification, the preselecting output channel signal is subjected to first frequency conversion with a sweep frequency source local oscillator Lo1, an intermediate frequency signal IF1 is output, and the intermediate frequency signal IF1 is subjected to a single-pole two-switch filter bank to obtain an intermediate frequency signal IF11 and an intermediate frequency signal IF 12; the intermediate frequency signal IF11 and the intermediate frequency signal IF12 are subjected to second frequency conversion with the sweep frequency local oscillator Lo2 respectively to obtain an intermediate frequency signal IF 2;
after low-pass filtering, numerical control attenuation and power amplification are carried out on the intermediate frequency signal IF2, a dot frequency signal is output through a band-pass filter, and the dot frequency signal and a local oscillator Lo3 output by a local oscillator Lo3 circuit module are subjected to third frequency conversion through a third mixer to obtain an intermediate frequency signal IF 3;
the intermediate frequency signal IF3 passes through a two-stage low-pass filter, a two-stage amplifier, a two-stage numerical control attenuator, a band-pass filter, a single-pole two-switch group, a high-gain differential amplifier and a final-stage power divider, and finally the intermediate frequency signal IF3 is divided into two paths of signals with equal amplitude and same phase for output.
The modular large dynamic high-speed channel conversion device has the following characteristics:
firstly, microwave signals received by a detection antenna are input into a dual-channel sub-network consisting of two single-pole two-switch switches to form two working modes of a low-noise path and a through path, wherein the low-noise path consists of continuous two-stage low-noise amplifiers and a temperature compensation attenuator, the other path consists of a 50-ohm microstrip line through, and the working modes can be switched according to the input signal power to expand the dynamic range of measurement.
Secondly, dividing the detected microwave signals into six signal channels, adopting a single-pole four-switch and single-pole three-switch combined dividing mode, enabling the high-frequency bands I, II and III with large insertion loss to go through with four single poles, enabling the four, V and six channels with small insertion loss to go through with three cascaded channels with one single pole, and filtering out high-order clutter by using a low-pass filter adopted by a seventh filter. And the signal power between channels before the first-stage mixer is ensured to be better in flatness by assisting the later-stage low-noise amplifier and the first equalizer.
And after the third intermediate frequency signal IF1, a switch filtering group consisting of two stages of single-pole two, four-stage single-pole and two paths of filters is arranged, so that two paths of intermediate frequency signals of the intermediate frequency signal IF11 and the intermediate frequency signal IF12 are obtained, and the intermediate frequency signal IF11 and the intermediate frequency signal IF12 are subjected to frequency conversion with the sweep frequency LO2 respectively to obtain the intermediate frequency signal IF2, so that the actual requirements of synchronous work and asynchronous work of the modules can be met.
The fourth and third digital control attenuators play the dual role of small step digital control attenuator, not only can be used for gain fine adjustment of the whole device, but also can be used for gain fine adjustment between different channels in the module 1 according to the channel frequency code, without actually replacing the attenuation device, and can also ensure good flatness in the whole frequency band.
And fifthly, a two-way switch filter group consisting of a single-pole two-switch and a crystal filter is added in the final-stage intermediate frequency link, a straight path is selected when a large signal is input, and a 200KHz narrow-band filter path is selected when a small signal is input, so that the height of the noise floor can be controlled by switching the straight path and the filter path, the sensitivity is improved, and the dynamic measurement range is enlarged.
Sixthly, the modularized large dynamic high-speed channel conversion device adopts a rail plug-in box type general modularized design, the modules 1, 2 and 3 are independently designed, the control and power supply between the modules 3 and 1 and 2 are only interconnected by adopting J30JM1-31ZKSY-Q6 connectors, the local oscillator transition between the modules 1 and 2 is only interconnected by adopting SMA cables, the terminal signal output is only bridged and interconnected by adopting insulator pins, and the size of the final general device is only 233.5X 158 & 18 3 。
Seventh, the following technical indexes are realized: 1) noise coefficient less than or equal to 8.5dB (low noise mode); 2) the flatness in the band is less than or equal to +/-2.5 dB; 3) image frequency suppression is more than or equal to 66 dBc; 4) the switching time of the channel mode is less than or equal to 96 ns; 5) the dynamic range is measured and is more than or equal to 120 dB; 6) modular, rail-cartridge size of only 233.5 x 158 x 18mm 3 。
The invention is described in further detail below with reference to the figures and the embodiments.
Examples
Fig. 1 is a basic schematic block diagram of the apparatus of the present invention, and the technical solution for implementing the present invention is: the general microwave channel conversion device firstly inputs microwave signals received by a detection antenna into a dual-channel sub-network consisting of two single-pole two-switch to form two working modes of a low-noise circuit and a straight-through circuit, wherein the low-noise circuit consists of two continuous stages of low-noise amplifiers and a temperature compensation attenuator. The lower link is a six-channel preselection switch filter bank, and the sequence of the two-three-channel link devices of the high frequency band is as follows: the single-pole four-switch input circuit comprises a single-pole four-switch input circuit, a cavity filter, a single-pole single switch and a single-pole four-switch output circuit; the low-frequency-band four-five-six channel link device sequence is as follows: the device comprises a single-pole four-switch input, a single-pole three-switch, a cavity filter, a single-pole three-switch, a low-pass filter and a single-pole four-switch output. After low-noise amplification, the channel signals output by preselection are subjected to first frequency conversion with a sweep frequency source local oscillator Lo1, a first intermediate frequency IF1 is output, and IF1 passes through a single-pole two-switch filter bank to obtain two paths of intermediate frequency signals of IF11 and IF 12. And the IF11 and the IF12 respectively perform second frequency conversion with the swept local oscillator Lo2 to obtain a second intermediate frequency IF 2. The IF2 is low-pass filtered, numerically controlled attenuated and power amplified, and then is filtered by a band-pass filter to obtain a dot frequency signal with a bandwidth of about 25 MHz. And the IF2 and the local oscillator Lo3 are subjected to third frequency conversion to obtain an intermediate frequency signal IF 3. The IF3 rear-stage link devices are respectively a two-stage low-pass filter, a two-stage amplifier, a two-stage numerical control attenuator, an IF3 band-pass filter with the bandwidth of 20MHz, a single-pole two-switch two-way signal (one way is straight-through, and the other way is a filtering signal with the bandwidth of 200 KHz), a high-gain differential amplifier, a final-stage power divider, and finally an intermediate-frequency signal IF3 is divided into two ways of signals with equal amplitude and in phase for output.
Fig. 2 is a schematic block diagram of the circuit design of the module 1, the input end single-pole two-mode selection switch adopts MASW-002102, in order to ensure the noise coefficient, the switch is followed by a two-stage low-noise amplifier HMC462, and the subsequent temperature compensation attenuator mainly plays a role in compensating the high and low temperature gain difference between the direct path and the low-noise path. The lower link is a six-channel pre-selection switch filter bank, the single-pole four switches 1 and 2 adopt MA4SW410B, the single-pole three switches 1 and 2 are MASW-003102-13590, and the single-pole single switches 1-3 select MA4AGSW1, so that the isolation degree of the low-frequency four-five-six-channel switch filter bank is ensured. The filters 1-6 are 6-channel division filters and deep customized band-pass filters, and the frequency band covers the F1-F2 ultra-wideband working frequency band supported by the device. The filter 7 is a low pass filter, and mainly reduces the higher harmonics of the forty-five-six channels. The amplifier 3 is also an HMC462 and is used to compensate for the gain loss of the switching filter bank and reduce the noise floor. In order to ensure the flatness of the intermediate frequency signal of each channel signal after the first-stage mixing, an equalizer 1 is arranged behind the amplifier 3, and the equalizer 1 is used for carrying out gain flattening on the broadband microwave signal before mixing. And outputting a first intermediate frequency IF1 after the first-stage frequency mixing is finished, wherein in order to meet the actual requirements of synchronous work and asynchronous work of the module, the IF1 obtains two intermediate frequency signals of IF11 and IF12 which achieve synchronous and asynchronous work through a switch filtering group consisting of single-pole two switches 3-4, single-pole single switches 4-7 and filters 8-9. The IF11 and the IF12 perform second frequency conversion with the sweep local oscillator Lo2, respectively, so as to obtain a second intermediate frequency IF 2. Meanwhile, an amplifying and filtering circuit of Lo3 and two paths of signals output by the terminal power divider are integrated in the module 1, the whole module 1 is assembled by adopting a micro-assembly process, and the laser seal welding cover plate realizes airtight waterproof sealing.
Fig. 3 is a schematic block diagram of the circuit design of the module 2, and the filter 10 is a low pass filter for filtering out high order noise. The numerical control attenuator 1 is an HMC274QS16 large step attenuator with the step of 1dB and is used for adjusting the dynamic range. The amplifier 6 is a MGA-82563 low noise amplifier that serves as gain compensation and noise suppression. The filter 11 is a customized band pass filter with a bandwidth of 20MHz for filtering out-of-band noise of the intermediate frequency signal IF 2. The amplified and filtered IF2 performs a third frequency conversion with the dot frequency local oscillator Lo3 at the mixer 3, and an intermediate frequency signal IF3 is obtained. The IF3 enters an amplifier 8 and an amplifier 9 for power amplification after high-order impurities after frequency conversion are filtered by a low-pass filter 13, the devices of the amplifiers 8 and 9 are TQP3M9028, an attenuator 4 between two stages of amplifiers is used for adjusting the input power value of the amplifier 9 to ensure that the amplifier 9 works in a linear working state, and a numerical control attenuator 2 in the middle is an HMC470LP3 large-step attenuator which is stepped by 1dB and is used for adjusting the dynamic range. The filter 14 is a customized bandpass filter with a bandwidth of 20MHz for filtering out-of-band noise of the IF 3. The module 2 has a four-stage amplifier in the radio frequency link, and because of the temperature characteristic of the amplifier, the gain fluctuation is large at high and low temperatures, the link is provided with a temperature compensation attenuator 2 and a temperature compensation attenuator 3 for balancing the high and low temperature gain fluctuation of the terminal output signal. The low pass filter 15 is used to supplement the far end clutter suppression of the band pass filter 14. Numerical control attenuator 3 is the little step attenuator of HMC792LP4E, and it is 0.25dB to step, and its effect has two, and firstly is used as the gain fine setting of whole microwave link, and another effect is just can be according to the channel frequency code in each channel in module 1 for the gain difference between the adjustment different passageways, thereby guarantee in whole F1~ F2 ultra wide band operating band, the flatness of IF3 terminal output signal is within the index range. In the design, the dynamic range requirement is more than 120dB, the noise floor is raised and the sensitivity is reduced under the state of small signals, so that the dynamic range is reduced, and in order to solve the problem, the invention designs that a two-way switch filter group consisting of single-pole two-way switches 5 and 6, a crystal filter and an attenuator 5 is added in a link, the single-pole two-way switches 5 and 6 adopt HMC336MS8G with high isolation, the crystal filter is a customized 200KHz narrow-band filter, and the attenuator 5 is used for adjusting the insertion loss of a direct path and a filtering path. When large signal is input, a straight path is selected, and when small signal is input, a 200KHz narrow-band filter path is selected, so that the noise floor can be reduced through narrow-band filtering, and the sensitivity is improved. The final amplifier is an LT5514 differential amplifier, the balun 1 and balun 2 are applied to a matching circuit, the gain of the amplifier is 33/30dBm, the controllable gain is switched, and the P1 can reach 20dBm, so that the gain and the power output of the whole link are ensured.
Fig. 4 is a circuit layout diagram of the modules 1, 2 and 3, and the module 3 is an independent control board unit integrated with a differential single-ended high-speed communication conversion circuit and connected with the CPCIe board card in a crimping manner. The module 1 is an independent sealing unit, the module 2 adopts a Rogers 4350 plate substrate, is assembled by an electric fitting process, is directly installed in the rail plug box and is subjected to three-proofing treatment by using three-proofing paint. The control and power supply between the module 3 and the modules 1 and 2 are interconnected only by adopting a J30JM1-31ZKSY-Q6 connector, the local oscillation transition between the module 1 and the module 2 is interconnected by adopting an SMA cable, and the terminal signal output is interconnected by adopting an insulator pin bridge.
The main technical indicators of the whole channel conversion device are as follows:
the working mode is as follows: low noise, normal shoot through;
noise coefficient: 12dB ≦ (low noise mode);
gain: not less than 40 dB;
flatness degree: less than or equal to +/-3 dB;
inputting a second-order intercept point: not less than 45 dBm;
inputting a third-order intercept point: not less than 10 dBm;
intermediate frequency suppression: not less than 60 dBm;
image frequency suppression: not less than 60 dBm;
instantaneous dynamic range: not less than 50 dB;
measuring the dynamic range: not less than 120 dB;
switching time: less than or equal to 120 ns;
finally, the overall dimensions of the device according to the invention are only 233.5 × 158 × 18mm 3 The track is inserted into the modular design of the box type, and the two sides of the insertion box are provided with the pulling-assistant devicesWare and front panel locking strip are for accurate butt joint installation, still are provided with the locating pin to inserting the interface side, are particularly useful for modularization quick assembly disassembly.
According to the embodiment, the invention has the following remarkable advantages:
1) the modular design of a standard rail plug box type is adopted, the whole device can be divided into 3 modules, and the modules 1 and 2 are connected with each other only by adopting horizontal transition insulator pins for signal transmission; the module 3 is an independent control panel unit and is integrated with a differential single-ended high-speed communication conversion circuit; the control and power supply among the module 3, the module 1 and the module 2 are interconnected only by adopting a J30JM1-31ZKSY-Q6 connector, all signal I/O and control interfaces are distributed on one side of the plug box, and CPCIe board card plug interfaces are adopted externally, so that the modular integration is easy;
2) the module 1 adopts a micro-assembly process and is sealed into a high-reliability independent component by laser seal welding; the module integrates a low-noise amplification/direct connection dual-mode switching front-end circuit module, a pre-selection switch filter bank circuit module and a two-stage frequency conversion circuit module. The double-mode switch and the channel change-over switch both adopt gallium arsenide MMIC electronic switches within 80ns, so that the high-speed performance of the device is ensured;
3) the module 2 adopts an electric fitting process and integrates a first-stage frequency conversion circuit module, an intermediate frequency amplification filter circuit module, a numerical control attenuation circuit module and other functional circuit modules; the small step numerical control attenuator can provide a gain leveling function for each channel in the module 1, and the two-stage large step numerical control attenuator is combined with the dual-mode switching in the module 1 to provide a measurement dynamic range adjusting function, so that the large dynamic performance of the device is ensured;
4) the microwave component can convert the F1-F2 ultra-wideband microwave signals received by the antenna into intermediate-frequency signals with IF (intermediate frequency) center frequencies for many times, has the advantages of large measurement dynamic range, low noise coefficient, good image rejection capability and high mode channel switching speed, and can be universally used for microwave components in electronic system equipment such as electronic reconnaissance and electronic countermeasure.
Claims (10)
1. The utility model provides a big dynamic high-speed channel conversion equipment of modularization which characterized in that, includes module 1, module 2, module 3, wherein:
the module 1 comprises a low-noise amplifier/direct-connection dual-mode switching front-end circuit module, a preselection switch filter bank circuit module, a two-stage frequency conversion circuit module and a local oscillator Lo3 circuit module which are sequentially arranged stage by stage; the low-noise amplifier/direct-connection dual-mode switching front-end circuit module comprises a dual-channel sub-network consisting of two single-pole two-switch switches, wherein the dual-channel sub-network forms two working modes of a low-noise link and a direct-connection link, and the low-noise link consists of two continuous stages of low-noise amplifiers and a temperature compensation attenuator; the pre-selection switch filter group circuit module adopts a single-pole four-switch and single-pole three-switch combined division form, a first three-channel and a second three-channel of a high frequency band adopt single-pole four-direct-connection, a fourth three-channel and a fifth three-channel of a low frequency band adopt cascade single-pole three-channel, and a low-pass filter is used for filtering out higher clutter; the two-stage frequency conversion circuit module comprises a first frequency mixer, a single-pole two-switch filter bank and a second frequency mixer which are sequentially arranged, wherein the first frequency mixer receives a channel signal which is output in a preselected mode and is subjected to low-noise amplification processing, then performs first frequency conversion with a local oscillator Lo1, and outputs an intermediate frequency signal IF 1; the intermediate frequency signal IF1 passes through a single-pole two-switch filter bank to obtain an intermediate frequency signal IF11 and an intermediate frequency signal IF 12; the intermediate frequency signal IF11 and the intermediate frequency signal IF12 are input into a second mixer to perform second frequency conversion with a local oscillator Lo2, and an intermediate frequency signal IF2 is obtained;
the module 2 comprises a first-stage frequency conversion circuit module, an intermediate frequency amplification filter circuit module, a numerical control attenuation circuit module, two switch filter banks, a differential amplifier and a final-stage power divider; the first-stage frequency conversion circuit module comprises a third mixer, the intermediate frequency signal IF2 is subjected to low-pass filtering, numerical control attenuation and power amplification, and then is output as a dot frequency signal through a band-pass filter, and the dot frequency signal and the local oscillator Lo3 output by the local oscillator Lo3 circuit module are subjected to third frequency conversion through the third mixer to obtain an intermediate frequency signal IF 3; the intermediate frequency amplifying and filtering circuit module comprises a two-stage low-pass filter, a two-stage amplifier and an IF3 band-pass filter with the bandwidth of 20 MHz; the numerical control attenuation circuit module comprises two stages of numerical control attenuators; the two-way switch filter bank adopts a single-pole two-switch bank to generate two-way signals, one way is a through way, and the other way is a filtering signal with the bandwidth of 200 KHz; the intermediate frequency signal IF3 passes through a two-stage low-pass filter, a two-stage amplifier, a two-stage numerical control attenuator, a band-pass filter, a single-pole two-switch group, a high-gain differential amplifier and a final-stage power divider, and finally the intermediate frequency signal IF3 is divided into two paths of signals with equal amplitude and same phase for output;
the module 3 is an independent control panel unit and is used for controlling and supplying power between the module 1 and the module 2, and the module 3 is integrated with a differential single-ended high-speed communication conversion circuit and is connected with the CPCIe board card in a compression joint mode.
2. The modular large dynamic high-speed channel transformation device according to claim 1, wherein the module 1 is an independent sealing unit, the assembly is realized by adopting a micro-assembly process, and the airtight waterproof sealing is realized by laser seal welding cover plates; the module 2 adopts a Rogers 4350 plate substrate, is assembled by an electric fitting process, is directly installed in the track insert box, and is subjected to three-proofing treatment by using three-proofing paint; the control and power supply among the module 3, the module 1 and the module 2 are interconnected by adopting a J30JM1-31ZKSY-Q6 connector, the local oscillation transition between the module 1 and the module 2 is interconnected by adopting an SMA cable, and the terminal signal output is interconnected by adopting an insulator pin bridge.
3. The apparatus according to claim 2, wherein the low noise/pass-through dual-mode switching front-end circuit module comprises a first single-pole two-switch, a first amplifier, a second amplifier, a first temperature compensation attenuator, and a second single-pole two-switch, one output of the first single-pole two-switch is connected to the first amplifier, the second amplifier, and the first temperature compensation attenuator in sequence and connected to one input of the second single-pole two-switch, and the other output of the first single-pole two-switch is connected to the other input of the second single-pole two-switch by a pass-through manner.
4. The modular large dynamic high speed channel switching device according to claim 2, wherein the pre-selection switch filter bank circuit module comprises a first single-pole four-switch, a second single-pole four-switch and a six-channel pre-selection switch filter bank arranged therebetween;
the connection sequence of the first, second and third channel link devices of the high frequency band is as follows: the first output end of the first single-pole four-switch is connected with the first filter and the first single-pole single switch in sequence and then is connected with the first input end of the second single-pole four-switch; the second output end of the first single-pole four-switch is connected with the second filter and the second single-pole four-switch in sequence and then is connected with the second input end of the second single-pole four-switch; a third output end of the first single-pole four-switch is sequentially connected with a third filter and a third single-pole single switch and then is connected with a third input end of the second single-pole four-switch;
the connection sequence of the fourth, fifth and sixth channel link devices of the low frequency band is as follows: a fourth output end of the first single-pole four switch is connected with a first single-pole three switch, a first output end of the first single-pole three switch is connected with a first input end of a second single-pole three switch through a fourth filter, a second output end of the first single-pole three switch is connected with a second input end of the second single-pole three switch through a fifth filter, a third output end of the first single-pole three switch is connected with a third input end of the second single-pole three switch through a sixth filter, and an output end of the second single-pole three switch is connected with a fourth input end of the second single-pole four switch through a seventh filter;
the output end of the second single-pole four-switch is connected with the two-stage frequency conversion circuit module.
5. The device of claim 2, wherein the two-stage frequency conversion circuit module comprises a first mixer, a single-pole two-switch filter bank, and a second mixer, which are arranged in sequence; the output signal of the pre-selection switch filtering group circuit module is connected with a third amplifier and a first equalizer in sequence and then is connected to one input end of a first frequency mixer, a local oscillator Lo1 is connected with a fourth amplifier and a first attenuator in sequence and then is connected to the other input end of the first frequency mixer, and the output end of the first frequency mixer outputs an intermediate frequency signal IF 1;
the single-pole two-switch filter bank comprises a third single-pole two switch and a fourth single-pole two switch, the input end of the third single-pole two switch is connected with the output end of the first frequency mixer, the first output end of the third single-pole two switch is connected with the fourth single-pole single switch, the eighth filter and the sixth single-pole single switch in sequence and then is connected with the first input end of the fourth single-pole two switch, and the second output end of the third single-pole two switch is connected with the fifth single-pole single switch, the ninth filter and the seventh single-pole single switch in sequence and then is connected with the second input end of the fourth single-pole two switch; the output end of the fourth single-pole two-switch is connected to one input end of the second frequency mixer; the local oscillator Lo2 is sequentially connected to the fifth amplifier and the second attenuator, and then is connected to the other input terminal of the second mixer, and the output terminal of the second mixer outputs an intermediate frequency signal IF 2.
6. The modular high-dynamic high-speed channel conversion device according to claim 2, wherein the local oscillator Lo3 circuit module includes a seventh amplifier, a twelfth filter and a third attenuator connected in sequence, the local oscillator Lo3 inputs the seventh amplifier, and an output end of the third attenuator is connected to an input end of the third mixer.
7. The apparatus according to claim 2, wherein the module 2 comprises a first-stage frequency conversion circuit module, an intermediate frequency amplification filter circuit module, a digital control attenuation circuit module, two-way switch filter banks, a differential amplifier, and a final power divider, and specifically comprises:
the output end of the second mixer is connected with the tenth filter, the first numerical control attenuator, the sixth amplifier and the eleventh filter in sequence and then is connected with the other input end of the third mixer; the output end of the third mixer is sequentially connected with a thirteenth filter, an eighth amplifier, a fourth attenuator, a second numerical control attenuator, a ninth amplifier, a fourteenth filter, a second temperature compensation attenuator, a third numerical control attenuator, a fifteenth filter and a third temperature compensation attenuator and is connected to the input end of a fifth single-pole two-switch; one output end of the fifth single-pole two switch is connected with one input end of the sixth single-pole two switch through a crystal filter, the other output end of the fifth single-pole two switch is connected with the other input end of the sixth single-pole two switch through a fifth attenuator, the output end of the sixth single-pole two switch is connected with the first balun, the differential amplifier and the second balun in sequence and then is connected with the second power divider, and the second power divider outputs two paths of equal-amplitude and same-phase signals RFout1 and RFout 2.
8. The apparatus as claimed in claim 4, wherein the first to second single-pole four-switch uses MA4SW410B, the first to second single-pole three-switch is MASW-003102-13590, and the first to third single-pole single-switch selects MA4AGSW 1; the first filter, the second filter, the third filter and the fourth filter are 6-channel division filters, and the frequency band covers F1-F2 ultra wide band working frequency bands which can be supported by the device; the seventh filter is a low pass filter for reducing the higher harmonics of the four, five and six channels.
9. The apparatus of claim 7, wherein the modules 2 comprise the following components:
the tenth filter is a low-pass filter and is used for filtering out high-order clutter;
the first numerical control attenuator is an HMC274QS16 large step attenuator, the step is 1dB, and the dynamic range is adjusted;
the sixth amplifier is MGA-82563 low noise amplifier used for gain compensation and noise suppression;
the eleventh filter is a customized band-pass filter with the bandwidth of 20MHz and is used for filtering out-of-band clutter of the intermediate frequency signal IF 2;
the eighth amplifier and the ninth amplifier are TQP3M9028, the fourth attenuator is used for adjusting the input power value of the ninth amplifier to ensure that the ninth amplifier works in a linear working state, and the second numerical control attenuator is an HMC470LP3 large step attenuator, the step is 1dB, and the dynamic range is adjusted;
the fourteenth filter is a customized band-pass filter with the bandwidth of 20MHz and is used for filtering out-of-band clutter of the intermediate frequency signal IF 3;
the second temperature compensation attenuator and the third temperature compensation attenuator are used for balancing high and low temperature gain fluctuation of the terminal output signal;
the fifteenth filter adopts a low-pass filter, the fourteenth filter adopts a band-pass filter, and the fifteenth filter is used as a supplement for the far-end clutter suppression of the fourteenth filter;
the third numerical control attenuator is a small step attenuator HMC792LP4E, the step is 0.25dB, and the functions are two: firstly, the gain fine adjustment is used for the whole microwave link; secondly, adjusting the gain difference value between different channels according to the channel frequency codes in each channel in the module 1, thereby ensuring that the flatness of a terminal output signal is within an index range in the whole F1-F2 ultra-wideband working frequency band;
the fifth single-pole second switch and the sixth single-pole second switch both adopt HMC336MS8G, a crystal filter is a customized 200KHz narrow-band filter, and the fifth attenuator is used for adjusting the insertion loss of a straight path and a filtering path; when a large signal is input, a straight path is selected, and when a small signal is input, a 200KHz narrow-band filter path is selected;
the differential amplifier is LT5514, and the first balun and the second balun are applied matching circuits of the differential amplifier.
10. A modular large dynamic high-speed channel transformation method is based on the modular large dynamic high-speed channel transformation device of any one of claims 1 to 9, and comprises the following specific steps:
microwave signals received by a detection antenna are input into a dual-channel sub-network consisting of two single-pole two-switch switches to form two working modes of a low-noise circuit and a straight-through circuit, wherein the low-noise circuit consists of two continuous stages of low-noise amplifiers and a temperature compensation attenuator;
the lower link of the dual-channel sub-network is provided with a six-channel pre-selection switch filter bank, and the first, second and third channel link devices of the high frequency band are sequentially as follows: the single-pole four-switch input circuit comprises a single-pole four-switch input circuit, a cavity filter, a single-pole single switch and a single-pole four-switch output circuit; the low-frequency-band four-channel, five-channel and six-channel link devices are sequentially as follows: the device comprises a single-pole four-switch input, a single-pole three-switch, a cavity filter, a single-pole three-switch, a low-pass filter and a single-pole four-switch output;
after low-noise amplification, the preselecting output channel signal is subjected to first frequency conversion with a sweep frequency source local oscillator Lo1, an intermediate frequency signal IF1 is output, and the intermediate frequency signal IF1 is subjected to a single-pole two-switch filter bank to obtain an intermediate frequency signal IF11 and an intermediate frequency signal IF 12; the intermediate frequency signal IF11 and the intermediate frequency signal IF12 are subjected to second frequency conversion with the sweep frequency local oscillator Lo2 respectively to obtain an intermediate frequency signal IF 2;
after low-pass filtering, numerical control attenuation and power amplification are carried out on the intermediate frequency signal IF2, a dot frequency signal is output through a band-pass filter, and the dot frequency signal and a local oscillator Lo3 output by a local oscillator Lo3 circuit module are subjected to third frequency conversion through a third mixer to obtain an intermediate frequency signal IF 3;
the intermediate frequency signal IF3 passes through a two-stage low-pass filter, a two-stage amplifier, a two-stage numerical control attenuator, a band-pass filter, a single-pole two-switch group, a high-gain differential amplifier and a final-stage power divider, and finally the intermediate frequency signal IF3 is divided into two paths of signals with equal amplitude and same phase for output.
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| CN109639296A (en) * | 2018-12-25 | 2019-04-16 | 中国电子科技集团公司第三十六研究所 | A kind of analogue communication receiving and processing device |
| CN112688703A (en) * | 2020-12-21 | 2021-04-20 | 成都美数科技有限公司 | Miniaturized low-power consumption receiver |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115499025A (en) * | 2022-11-18 | 2022-12-20 | 成都广众科技有限公司 | Ultra-wideband radio frequency receiving module |
| CN115499025B (en) * | 2022-11-18 | 2023-03-21 | 成都广众科技有限公司 | Ultra-wideband radio frequency receiving module |
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