CN115664442A - 30MHz to 18GHz ultra wide band receiver - Google Patents
30MHz to 18GHz ultra wide band receiver Download PDFInfo
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- CN115664442A CN115664442A CN202211316638.7A CN202211316638A CN115664442A CN 115664442 A CN115664442 A CN 115664442A CN 202211316638 A CN202211316638 A CN 202211316638A CN 115664442 A CN115664442 A CN 115664442A
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Abstract
The invention discloses a 30MHz to 18GHz ultra-wideband receiver, which has the functions of amplifying and down-converting an ultra-wideband signal received by an antenna and outputting an intermediate frequency signal with lower frequency and bandwidth to a back-end processor. The ultra-wideband receiver is of a twice superheterodyne structure, a frequency spectrum of a frequency band from 30MHz to 18GHz needs to be moved to a frequency band below 4.1GHz, the instantaneous bandwidth of a received signal has four types of 4GHz/1GHz/600MHz/60MHz, wherein the 4GHz instantaneous bandwidth only appears in three frequency band signals of 2 GHz-6 GHz, 8 GHz-12 GHz and 10 GHz-18 GHz. The receiver comprises a low noise amplifier, a plurality of switches, an up-down frequency conversion, a filter/group, a numerical control attenuator, an amplifier and the like, wherein the filter/group and the switch are adopted to divide 30 GHz to 18GHz into seven frequency band signals, the four signal frequency spectrums with the instantaneous bandwidth of 4GHz/1GHz/600MHz/60MHz are all shifted to the central frequency of 2GHz by controlling the frequency of local oscillation signals of the corresponding frequency mixers, and the bandwidths of the corresponding filters are respectively 4GHz/1GHz/600MHz/60MHz. By adopting the scheme of the invention, all signal frequency spectrums can be shifted to the intermediate frequency signals with lower frequency and bandwidth, and the difficulty in back-end processing is reduced.
Description
Technical Field
The invention belongs to the technical field of ultra-wideband receivers, and particularly relates to a multi-frequency-conversion superheterodyne receiver comprising various filters.
Background
The ultra-wideband receiver is an important component of modern radar systems and wireless communication systems, has the functions of carrying out frequency conversion, filtering, amplification and the like on received radio-frequency signals in an extremely wide frequency band range, has the function of moving the frequency spectrum of the received signals to a lower frequency band which can be processed by a back-end processor, and comprises key components such as a filter bank, a switch, a frequency converter, a local vibration source and the like.
The frequency range of the received signals is extremely wide, the instantaneous bandwidth of the signals has four types of 4GHz/1GHz/600MHz/60MHz, wherein the 4GHz instantaneous bandwidth is only in three frequency bands of 2 GHz-6 GHz, 8 GHz-12 GHz and 10 GHz-18 GHz, according to a conventional design method, in order to ensure that all the signals are received without loss, a filter is designed according to the widest instantaneous bandwidth, and the signal to noise ratio of the signals received by a rear-end processor is not improved.
No description or report of the similar technology to the invention is found at present, and similar data at home and abroad are not collected yet.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a 30 MHz-18 GHz ultra-wideband receiver which can receive and process signals with instantaneous bandwidth of 4GHz/1GHz/600MHz/60MHz in the full frequency band, wherein the instantaneous bandwidth of 4GHz is only in three frequency bands of 2 GHz-6 GHz, 8 GHz-12 GHz and 10 GHz-18 GHz.
The invention provides a 30MHz to 18GHz ultra wide band receiver, comprising:
the input module is used for transmitting the amplified signal to a first filter bank after being subjected to pre-stage low-noise amplification;
the first filter bank is formed by connecting a plurality of filters with different bandwidths in parallel, the receiving frequency band is divided into a plurality of sections according to the frequency, the filter channels are switched and selected through the switch module, the low insertion loss of frequency signals in a pass band is ensured to pass, and the frequency signals outside the pass band are greatly inhibited;
the switch module is used for controlling the gating of a port and matching with the first filter group to select a pass band range;
the frequency converter comprises an up-converter, a down-converter and a down-converter, wherein the up-converter is used for shifting the frequency of an input signal to a higher frequency band and the down-converter is used for shifting the frequency of the input signal to a lower frequency band;
and the second filter bank is arranged at the final stage of the receiver, and the bandwidth of the second filter bank corresponds to that of signals with different instantaneous bandwidths respectively, and the switching and the selection of filter paths are carried out through the switch.
The first filter bank with various center frequencies and bandwidths arranged after the pre-stage low-noise amplification, the second filter bank with various center frequencies and bandwidths arranged at the final stage of the receiver, the bandwidths of the second filter banks correspond to various instantaneous bandwidth signals respectively, the center frequencies are 2GHz, and the first filter and the second filter bank perform switching and selection of filter paths through switches.
Preferably, the frequency of a received signal of the ultra-wideband receiver is 30MHz to 18GHz, and the instantaneous bandwidth of the signal is four types of 4GHz/1GHz/600MHz/60MHz, wherein the 4GHz instantaneous bandwidth only appears in signals of three frequency bands of 2GHz to 6GHz, 8GHz to 12GHz and 10GHz to 18 GHz.
Preferably, the switch module comprises a first switch, a second switch, a third switch, a fourth switch and a fifth switch;
the input module comprises a low noise amplifier and a numerical control attenuator, and signals are input into the low noise amplifier and the numerical control attenuator and are transmitted to the first switch and are connected with the first filter bank;
the first filter group comprises a first filter, a second filter, a third filter, a fourth filter, a fifth filter, a sixth filter and a seventh filter which are respectively controlled and connected by the first switch, the output end of the first filter and the first amplifier are connected to the third switch, and the second filter, the third filter, the fourth filter, the fifth filter, the sixth filter and the seventh filter are connected to the second switch in parallel;
the up-conversion comprises a first up-converter and a second up-converter, and the output end of the second switch, the first up-converter, the second amplifier, the ninth filter, the down-conversion unit and the third amplifier are connected to the third switch; the other output end of the second switch, the second up-converter, the fourth amplifier and the eighth filter are connected to the third switch, the output end of the third switch and the fourth switch are connected and transmitted to a second filter bank, and the output end of the second filter bank and the fifth switch are connected to output signals.
Preferably, the passband of the first filter is DC-4 GHz, and the signal in the frequency range is amplified and then directly output to the input end of the second filter bank through switching gating of a switch without performing up-conversion and down-conversion.
Preferably, the passband frequency range of the second filter is 30MHz to 150MHz, the local frequency of the second up-converter is switched and controlled by a switch, the second filter channel signal is up-converted to 1GHz independently, and the signal is amplified and filtered and then output to the input end of the second filter bank by switching and gating through the switch.
Preferably, the first filter bank includes a third filter to the seventh filter, the third filter has a passband frequency range of 2GHz to 6GHz, the fourth filter has a passband frequency range of 5.5GHz to 8.5GHz, the fifth filter has a passband frequency range of 8GHz to 12GHz, the sixth filter has a passband frequency range of 10GHz to 18GHz, and the seventh filter has a passband frequency range of 14GHz to 20GHz.
Preferably, the first filter bank includes a third filter to a seventh filter, the local frequency of the first up-converter is switched and controlled by a switch, the signals passing through the third filter to the seventh filter are up-converted to 22GHz, the signals are amplified, filtered and then down-converted, and the down-converted signals are gated and output to the input end of the second filter bank by switching the switch.
Preferably, the second filter bank includes a tenth filter, an eleventh filter, a twelfth filter and a thirteenth filter connected in parallel, the bandwidths are 4GHz/1GHz/600MHz/60MHz, respectively, and the center frequency of each filter in the second filter bank is 2GHz.
Compared with the prior art, the invention has the beneficial effects that:
by adopting the design method, two stages of filter banks are designed in the receiver, wherein the filter bank 1 at the output end of the front-stage low-noise amplifier comprises seven bandwidth filters, the filter bank 2 at the output end of the final-stage low-noise amplifier comprises four bandwidth filters, the lowest frequency part (30 MHz-150 MHz) of a received signal is subjected to primary up-conversion, the lower frequency part (DC-4 GHz) is not subjected to frequency conversion, signals of other frequency bands are subjected to primary up-conversion, and then are subjected to down-conversion after the amplification filter is carried out on the Ku frequency band. Aiming at different frequency signals with extremely wide frequencies, the signals are subjected to up-conversion or down-conversion to intermediate frequency signals with the same fixed frequency by controlling the local oscillation frequency change of each frequency mixer. All signals are processed through the filter bank 2 at the final stage, and the four filter bandwidths of the filter bank 2 correspond to the bandwidths of the four instantaneous signals, so that the signal-to-noise ratio of the output signals can be further improved. The design method of the invention can ensure that all 4GHz/1GHz/600MHz/60MHz received signals can pass through amplification without loss, and the receiver has simpler structure.
Drawings
Fig. 1 is a schematic block diagram of a 30MHz to 18GHz ultra-wideband receiver according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Fig. 1 is a block diagram of a 30MHz to 18GHz uwb receiver design according to the present invention, and as shown in the embodiment of fig. 1, the functions of the main modules are as follows:
the input module is used for transmitting the amplified signal to the first filter bank after being subjected to low-noise amplification of a preceding stage; a low noise amplifier: amplifying the received input signal, and having extremely low noise coefficient and extremely wide frequency response range;
the first filter bank is formed by connecting a plurality of filters with different bandwidths in parallel, the receiving frequency band is divided into a plurality of sections according to the frequency, the filter channels are switched and selected through the switch module, the low insertion loss of frequency signals in a pass band is ensured to pass, and the frequency signals outside the pass band are greatly inhibited;
the switch module is used for controlling the gating of a port and matching with the first filter group to select a pass band range;
the frequency converter comprises an up-converter, a down-converter and a down-converter, wherein the up-converter is used for shifting the frequency of an input signal to a higher frequency band and the down-converter is used for shifting the frequency of the input signal to a lower frequency band; the system comprises two up-converters and one down-converter;
and the second filter bank is arranged at the final stage of the receiver, and the bandwidth of the second filter bank corresponds to that of signals with different instantaneous bandwidths respectively, and the switching and the selection of filter paths are carried out through the switch.
The receiving frequency band is divided into seven segments according to the frequency.
A first filter bank with seven central frequencies and bandwidths is designed after pre-stage low-noise amplification, the seven filters are realized in parallel, a second filter bank with four central frequencies and bandwidths is designed at the final stage of the receiver, namely the four filters are realized in parallel, the bandwidths of the second filter bank correspond to four instantaneous bandwidth signals respectively, and the central frequencies are 2GHz.
The receiver adopted by the embodiment of the invention has the functions of amplifying and down-converting the ultra-wideband signal received by the antenna and outputting an intermediate frequency signal with lower frequency and bandwidth to the back-end processor. The ultra-wideband receiver is of a twice superheterodyne structure, a frequency band signal spectrum from 30 GHz to 18GHz needs to be moved to a frequency band below 4.1GHz, the instantaneous bandwidth of a received signal has four types of 4GHz/1GHz/600MHz/60MHz, and the 4GHz instantaneous bandwidth only appears in three frequency band signals of 2 GHz-6 GHz, 8 GHz-12 GHz and 10 GHz-18 GHz. The receiver comprises a low noise amplifier, a plurality of switches, an up-down frequency conversion, a filter/group, a numerical control attenuator, an amplifier and the like, wherein the filter/group and the switch are adopted to divide 30 GHz to 18GHz into seven frequency band signals, the frequency of local oscillation signals of the corresponding frequency mixer is controlled to shift four signal frequency spectrums with instantaneous bandwidths of 4GHz/1GHz/600MHz/60MHz to 2GHz central frequency, and the bandwidths of the corresponding filters are respectively 4GHz/1GHz/600MHz/60MHz. By adopting the scheme of the invention, all signal frequency spectrums can be moved to the intermediate frequency signals with lower frequency and bandwidth, and the difficulty of back-end processing is reduced.
Specifically, the frequency of a signal received by the ultra-wideband receiver is 30MHz to 18GHz, and the instantaneous bandwidth of the signal is four types of 4GHz/1GHz/600MHz/60MHz, wherein the 4GHz instantaneous bandwidth only appears in signals of three frequency bands of 2GHz to 6GHz, 8GHz to 12GHz and 10GHz to 18 GHz.
Specifically, the switch module includes a first switch, a second switch, a third switch, a fourth switch, and a fifth switch, which correspond to switch 1, switch 2, switch 3, switch 4, and switch 5 in the drawing, and all the switches are reciprocal.
The switch 1 is a single-pole seven-throw switch having one input and seven gated outputs.
The switch 2 is a double-pole seven-throw switch array having seven inputs and two gated outputs.
The switch 3 is a single-pole, triple-throw switch having one input terminal and three gated output terminals.
The switches 4 and 5 are single pole, four throw switches having one input and four gated outputs, wherein the switches 5 are used in reverse, i.e. the outputs are used for signal input.
The input module comprises a low noise amplifier and a numerical control attenuator, and signals are input into the low noise amplifier and the numerical control attenuator and are transmitted to the first switch and are connected with the first filter bank;
the first filter group comprises a first filter, a second filter, a third filter, a fourth filter, a fifth filter, a sixth filter and a seventh filter which are respectively controlled and connected by the first switch, the output end of the first filter and the first amplifier are connected to the third switch, and the second filter, the third filter, the fourth filter, the fifth filter, the sixth filter and the seventh filter are connected to the second switch in parallel;
the up-conversion comprises a first up-converter and a second up-converter, and the output end of the second switch, the first up-converter, the second amplifier, the ninth filter, the down-conversion unit and the third amplifier are connected to the third switch; the other output end of the second switch, the second up-converter, the fourth amplifier and the eighth filter are connected to the third switch, the output end of the third switch and the fourth switch are connected and transmitted to a second filter bank, and the output end of the second filter bank and the fifth switch are connected to output signals.
As will be understood in the art, filter bank 1 and filter bank 2 may be switched and selected by switches. Of which the first filter bank is filter bank 1 and the second filter bank is filter bank 2.
The passband frequency range of the filter 1 in the filter bank 1 is DC-4 GHz, and the signal is amplified and then directly output to the final filter bank 2 through switching of a switch without up-conversion or down-conversion.
The pass band frequency range of the filter 2 in the filter bank 1 is 30 MHz-150 MHz, the signal is switched by a switch, the up-conversion local oscillation frequency is controlled, namely the frequency range is 850 MHz-970 MHz, the up-conversion is independently carried out to 1GHz, the signal is amplified and filtered, and the signal is switched by the switch to be output to the filter bank 2 after the bandwidth of the filter is 60MHz.
The passband frequency range of the filter 3 in the filter bank 1 is 2 GHz-6 GHz, the passband frequency range of the filter 4 is 5.5 GHz-8.5 GHz, the passband frequency range of the filter 5 is 8 GHz-12 GHz, the passband frequency range of the filter 6 is 10 GHz-18 GHz, the passband frequency range of the filter 7 is 14 GHz-20 GHz, the passband ranges of the filters are overlapped appropriately, so that the widest instantaneous bandwidth signal can be ensured to pass through at least one of the filters, the up-conversion local oscillation frequency is switched and controlled through a switch, the frequency range is 20 GHz-40 GHz, the channel of signals is up-converted to 22GHz, the channel of signals is amplified and filtered, namely the bandwidth of the filter is 4GHz, and then down-converted, namely the local oscillation frequency is 19.9GHz, and the down-converted signals are output to the input end of the filter bank 2 through the switch.
Those skilled in the art will understand that the first filter, the second filter, the third filter, the fourth filter, the fifth filter, the sixth filter, the seventh filter, the eighth filter, the ninth filter, the tenth filter, the eleventh filter, the twelfth filter, and the thirteenth filter correspond to the filter 1, the filter 2, the filter 3, the filter 4, the filter 5, the filter 6, the filter 7, the filter 8, the filter 9, the filter 10, the filter 11, the filter 12, and the filter 13 in the drawings.
Specifically, the passband of the first filter is DC-4 GHz, and the signal in the frequency range is amplified and then directly output to the input end of the second filter bank through switching and gating without performing up-conversion and down-conversion.
Specifically, the passband frequency range of the second filter is 30MHz to 150MHz, the local oscillation frequency of the second up-converter is switched and controlled through a switch, the channel signal of the second filter is independently up-converted to 1GHz, and the signal is amplified and filtered and then output to the input end of the second filter bank through switching gating.
Specifically, the first filter bank includes a third filter to the seventh filter, the third filter has a passband frequency range of 2GHz to 6GHz, the fourth filter has a passband frequency range of 5.5GHz to 8.5GHz, the fifth filter has a passband frequency range of 8GHz to 12GHz, the sixth filter has a passband frequency range of 10GHz to 18GHz, and the seventh filter has a passband frequency range of 14GH z to 20GHz.
Specifically, the first filter bank includes a third filter to a seventh filter, the local frequency of the first up-converter is switched and controlled by a switch, the signals passing through the third filter to the seventh filter are up-converted to 22GHz, the signals are amplified and filtered and then down-converted, and the down-converted signals are gated and output to the input end of the second filter bank by switching the switch.
Specifically, the second filter bank includes a tenth filter, an eleventh filter, a twelfth filter and a thirteenth filter connected in parallel, bandwidths are 4GHz/1GHz/600MHz/60MHz, respectively, and a center frequency of each filter in the second filter bank is 2GHz.
Finally, it should be noted that: various modifications and variations of a 30MHz to 18GHz ultra wideband receiver design of the present invention may be made by those skilled in the art without departing from the true scope of the present invention. The above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (8)
1. A 30MHz to 18GHz ultra wideband receiver, comprising:
the input module is used for transmitting the amplified signal to the first filter bank after being subjected to low-noise amplification of a preceding stage;
the first filter bank is formed by connecting a plurality of filters with different bandwidths in parallel, the receiving frequency band is divided into a plurality of sections according to the frequency, the filter channels are switched and selected through the switch module, the low insertion loss of frequency signals in a pass band is ensured to pass, and the frequency signals outside the pass band are greatly inhibited;
the switch module is used for controlling gating of a port and selecting a passband range by matching with the first filter bank;
the frequency converter comprises an up-converter, a down-converter and a frequency converter, wherein the up-converter is used for shifting the frequency of an input signal to a higher frequency band and the down-converter is used for shifting the frequency of the input signal to a lower frequency band;
the second filter bank is arranged at the final stage of the receiver, and the bandwidth of the second filter bank respectively corresponds to different instantaneous bandwidth signals, and the switching and selection of filter paths are carried out through a switch;
the first filter bank with various center frequencies and bandwidths arranged after the pre-stage low-noise amplification, the second filter bank with various center frequencies and bandwidths arranged at the final stage of the receiver, the bandwidths of the second filter banks correspond to various instantaneous bandwidth signals respectively, the center frequencies are 2GHz, and the first filter and the second filter bank perform switching and selection of filter paths through switches.
2. The 30MHz to 18GHz ultra-wideband receiver of claim 1, wherein the frequency of the received signal is 30MHz to 18GHz, and the instantaneous bandwidth of the signal is four types of 4GHz/1GHz/600MHz/60MHz, wherein the 4GHz instantaneous bandwidth only appears in three frequency bands of 2GHz to 6GHz, 8GHz to 12GHz and 10GHz to 18 GHz.
3. The 30MHz to 18GHz ultra-wideband receiver of claim 1, wherein the switch module comprises a first switch, a second switch, a third switch, a fourth switch, and a fifth switch;
the input module comprises a low noise amplifier and a numerical control attenuator, and signals are input into the low noise amplifier and the numerical control attenuator and are transmitted to the first switch and are connected with the first filter bank;
the first filter group comprises a first filter, a second filter, a third filter, a fourth filter, a fifth filter, a sixth filter and a seventh filter which are respectively controlled and connected by the first switch, the output end of the first filter and the first amplifier are connected to the third switch, and the second filter, the third filter, the fourth filter, the fifth filter, the sixth filter and the seventh filter are connected to the second switch in parallel;
the up-conversion comprises a first up-converter and a second up-converter, and the output end of the second switch, the first up-converter, the second amplifier, the ninth filter, the down-conversion unit and the third amplifier are connected to the third switch; the other output end of the second switch, the second up-converter, the fourth amplifier and the eighth filter are connected to the third switch, the output end of the third switch and the fourth switch are connected and transmitted to a second filter bank, and the output end of the second filter bank and the fifth switch are connected to output signals.
4. The 30MHz to 18GHz ultra-wideband receiver of claim 3, wherein the passband of the first filter is in the range of DC to 4GHz, and signals in the frequency range are amplified and then directly output to the input end of the second filter bank through switch gating without up-conversion and down-conversion.
5. The 30MHz to 18GHz ultra-wideband receiver of claim 3, wherein the passband frequency of said second filter is in the range of 30MHz to 150MHz, the local oscillator frequency of said second up-converter is switched and controlled by a switch, the second filter path signal is up-converted to 1GHz alone, and after amplification and filtering, the signal is gated and output to the input end of said second filter bank by the switch.
6. The 30MHz to 18GHz ultra-wideband receiver of claim 3, wherein the first filter bank comprises a third filter to the seventh filter, the third filter having a passband in the frequency range of 2GHz to 6GHz, the fourth filter having a passband in the frequency range of 5.5GHz to 8.5GHz, the fifth filter having a passband in the frequency range of 8GHz to 12GHz, the sixth filter having a passband in the frequency range of 10GHz to 18GHz, and the seventh filter having a passband in the frequency range of 14GHz to 20GHz.
7. The 30MHz to 18GHz ultra-wideband receiver of claim 3, wherein said first filter bank comprises a third filter to said seventh filter, and wherein said first up-converter local oscillator frequency is switched and controlled by a switch to up-convert the signals of said third filter to said seventh filter path to 22GHz, said signals are amplified, filtered and then down-converted, and the down-converted signals are gated to the input of said second filter bank by the switch.
8. The 30MHz to 18GHz ultra-wideband receiver of claim 3, wherein said second filter bank comprises a tenth filter, an eleventh filter, a twelfth filter and a thirteenth filter connected in parallel, each having a bandwidth of 4GHz/1GHz/600MHz/60MHz, and each filter in said second filter bank has a center frequency of 2GHz.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202211316638.7A CN115664442A (en) | 2022-10-26 | 2022-10-26 | 30MHz to 18GHz ultra wide band receiver |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211316638.7A CN115664442A (en) | 2022-10-26 | 2022-10-26 | 30MHz to 18GHz ultra wide band receiver |
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| Publication Number | Publication Date |
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| CN115664442A true CN115664442A (en) | 2023-01-31 |
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| CN202211316638.7A Pending CN115664442A (en) | 2022-10-26 | 2022-10-26 | 30MHz to 18GHz ultra wide band receiver |
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