CN109257057B - Ultra-wideband superheterodyne receiving system - Google Patents
Ultra-wideband superheterodyne receiving system Download PDFInfo
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- CN109257057B CN109257057B CN201811322135.4A CN201811322135A CN109257057B CN 109257057 B CN109257057 B CN 109257057B CN 201811322135 A CN201811322135 A CN 201811322135A CN 109257057 B CN109257057 B CN 109257057B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/06—Receivers
- H04B1/16—Circuits
- H04B1/26—Circuits for superheterodyne receivers
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/005—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission adapting radio receivers, transmitters andtransceivers for operation on two or more bands, i.e. frequency ranges
- H04B1/0053—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission adapting radio receivers, transmitters andtransceivers for operation on two or more bands, i.e. frequency ranges with common antenna for more than one band
- H04B1/0057—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission adapting radio receivers, transmitters andtransceivers for operation on two or more bands, i.e. frequency ranges with common antenna for more than one band using diplexing or multiplexing filters for selecting the desired band
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/005—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission adapting radio receivers, transmitters andtransceivers for operation on two or more bands, i.e. frequency ranges
- H04B1/0053—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission adapting radio receivers, transmitters andtransceivers for operation on two or more bands, i.e. frequency ranges with common antenna for more than one band
- H04B1/006—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission adapting radio receivers, transmitters andtransceivers for operation on two or more bands, i.e. frequency ranges with common antenna for more than one band using switches for selecting the desired band
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/005—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission adapting radio receivers, transmitters andtransceivers for operation on two or more bands, i.e. frequency ranges
- H04B1/0067—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission adapting radio receivers, transmitters andtransceivers for operation on two or more bands, i.e. frequency ranges with one or more circuit blocks in common for different bands
- H04B1/0071—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission adapting radio receivers, transmitters andtransceivers for operation on two or more bands, i.e. frequency ranges with one or more circuit blocks in common for different bands using a common intermediate frequency for more than one band
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/005—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission adapting radio receivers, transmitters andtransceivers for operation on two or more bands, i.e. frequency ranges
- H04B1/0067—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission adapting radio receivers, transmitters andtransceivers for operation on two or more bands, i.e. frequency ranges with one or more circuit blocks in common for different bands
- H04B1/0082—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission adapting radio receivers, transmitters andtransceivers for operation on two or more bands, i.e. frequency ranges with one or more circuit blocks in common for different bands with a common local oscillator for more than one band
Abstract
The invention discloses an ultra-wideband superheterodyne receiving system. The system comprises a receiving front end, a 0.38-2GHz receiving channel, a 2-6GHz receiving channel, a 6-18GHz receiving channel, a 18-40GHz receiving channel, a local oscillator source circuit, an intermediate frequency processing circuit and a shielding box body. The system receives frequency signals within the range of 0.38-40GHz from outside to inside through an antenna, switches the signals into each path of receiving channels through a switch, and then a mixer in each path of receiving channels moves other signal frequencies into a frequency band of 6-18GHz by sharing one 12GHz local vibration source; after the signals in all paths of receiving channels are integrated, the signals are switched to an intermediate frequency processing circuit through a switch, the signals are processed by sharing one 6-18GHz intermediate frequency processing circuit, and finally intermediate frequency signals are output. The invention has the advantages of high integration level, small volume, wide working frequency band and high index consistency, and has wide application prospect.
Description
Technical Field
The invention belongs to the technical field of microwaves, and particularly relates to an ultra-wideband superheterodyne receiving system.
Background
Superheterodyne receiving systems occupy a significant position in many fields of radar, communication, navigation, remote control, electronic warfare, and the like. After the receiving system receives the external electromagnetic wave spectrum through the antenna, the signal is moved to the intermediate frequency with lower frequency through frequency conversion, and then digital signal processing is carried out. The superheterodyne receiving system is a key component of the receiving system, and its performance superiority plays a key role in the overall system performance, so that the demand for the superheterodyne receiving system, especially the superheterodyne receiving system, is increasing.
Because the frequency range of 0.38-40GHz covers hundreds of octaves, signal sorting is needed through a switch filter bank, false components are avoided, and the segmented signals are mixed with local oscillation signals in respective channels for multiple times to obtain intermediate frequency signals. The antenna receives the signal and divides the signal into five sections: five receiving channels of 0.38-2GHz, 2-6GHz, 6-18GHz, 18-30GHz and 30-40GHz, so that a plurality of local oscillation sources are needed for frequency conversion in the channels to provide local oscillation signals, the cost is greatly increased, the space arrangement is very tedious, and the miniaturization design cannot be met.
Disclosure of Invention
The invention aims to provide a 0.38-40GHz ultra-wideband superheterodyne receiving system with high integration level and excellent performance.
The technical solution for realizing the purpose of the invention is as follows: an ultra-wideband superheterodyne receiving system comprises a receiving front end, a 0.38-2GHz receiving channel, a 2-6GHz receiving channel, a 6-18GHz receiving channel, a 18-40GHz receiving channel, a local oscillator source circuit and an intermediate frequency processing circuit, wherein:
the receiving front end receives frequency signals within the range of 0.38-40GHz from the outside through an antenna, and switches the received signals into each path of receiving channels through a switch;
the local oscillator source circuit comprises a 12GHz local oscillator source and outputs three paths of signals through the power divider, wherein the three paths of signals are respectively output to a 0.38-2GHz receiving channel, a 2-6GHz receiving channel and an 18-40GHz receiving channel;
the frequency mixer in the three paths of receiving channels adjusts the signal frequency of the receiving channels to be within a frequency band of 6-18GHz through sharing a 12GHz local oscillation source in a local oscillation source circuit;
and the intermediate frequency processing circuit receives signals input by each path of receiving channel by adopting a change-over switch, and outputs intermediate frequency signals finally by passing each path of signals through a 6-18GHz intermediate frequency processing circuit.
Further, the system also comprises a shielding box body, the shielding box body comprises an upper cavity and a lower cavity, the receiving front end, the 0.38-2GHz receiving channel, the 2-6GHz receiving channel, the 6-18GHz receiving channel and the 18-40GHz receiving channel are arranged in the upper cavity, and the local oscillator source circuit and the intermediate frequency processing circuit are arranged in the lower cavity.
Further, the local oscillator source circuit comprises a 12GHz local oscillator source, a power divider and a frequency multiplier which are sequentially connected, the output of the power divider provides local oscillator signals for mixers in a 0.38-2GHz receiving channel and a 2-6GHz receiving channel respectively, and the output of the frequency multiplier provides local oscillator signals for mixers in an 18-40GHz receiving channel and is used for adjusting the signal frequency of the receiving channel.
Further, the receiving front end comprises an antenna, an amplitude limiter and a first switch which are sequentially connected, the antenna receives signals in the external 0.38-40GHz range to the receiving front end, and the signals are switched to each path of receiving channel through the first switch after being limited by the amplitude limiter.
Further, the 0.38-2GHz receiving channel comprises a 0.38-2GHz band-pass filter, a first low-noise amplifier, a 0.38-2GHz switch filter bank, a first mixer, a 12.38-14GHz band-pass filter and a second low-noise amplifier which are connected in sequence;
when the first switch is switched to a 0.38-2GHz receiving channel, signals respectively pass through a 0.38-2GHz band-pass filter, a first low noise amplifier, a 0.38-2GHz switch filter bank, a first mixer, a 12.38-14GHz band-pass filter and a second low noise amplifier and then enter an intermediate frequency processing circuit, wherein local oscillation signals of the first mixer are generated by a 12GHz local oscillation source in a local oscillation source circuit, and after passing through a power divider, the signals enter the first mixer and a main signal of the receiving channel to mix, and the signal frequency of the receiving channel is adjusted to be within a 6-18GHz frequency band.
Further, the 2-6GHz receiving channel comprises a 2-6GHz band-pass filter, a third low-noise amplifier, a 2-6GHz switch filter bank, a second mixer, a 14-18GHz band-pass filter and a fourth low-noise amplifier which are connected in sequence;
when the first switch is switched to a 2-6GHz receiving channel, signals respectively pass through a 2-6GHz band-pass filter, a third low noise amplifier, a 2-6GHz switch filter bank, a second mixer, a 14-18GHz band-pass filter and a fourth low noise amplifier and then enter an intermediate frequency processing circuit, wherein local oscillation signals of the second mixer are generated by 12GHz local oscillation sources in a local oscillation source circuit, and enter a second mixer and a main signal frequency mixing of the receiving channel after passing through a power divider, so that the signal frequency of the receiving channel is adjusted to be within a 6-18GHz frequency band.
Further, the 6-18GHz receiving channel comprises a first 6-18GHz band-pass filter and a fifth low-noise amplifier which are connected in sequence;
when the first switch is switched to a 6-18GHz receiving channel, signals respectively pass through a first 6-18GHz band-pass filter and a fifth low-noise amplifier and then enter an intermediate frequency processing circuit.
Further, the 18-40GHz receiving channel is divided into two channels for adjusting signal frequency, one channel comprises an 18-30GHz band-pass filter, a sixth low-noise amplifier, a first filter, a second switch, a third mixer, a third switch, a second 6-18GHz band-pass filter and a seventh low-noise amplifier which are sequentially connected, and the other channel comprises a 30-40GHz band-pass filter, an eighth low-noise amplifier, a second filter, a second switch, a third mixer, a third switch, an 8-18GHz band-pass filter and a ninth low-noise amplifier which are sequentially connected;
when the first switch is switched to the 18-40GHz receiving channel, the signal is divided into two paths of 18-30GHz and 30-40GHz for mixing:
when the second switch and the third switch are switched to one path of 18-30GHz, signals respectively pass through an 18-30GHz band-pass filter, a sixth low-noise amplifier, a first filter, a second switch, a third mixer, a third switch, a second 6-18GHz band-pass filter and a seventh low-noise amplifier and then enter an intermediate frequency processing circuit, wherein local oscillation signals of the third mixer are generated by 12GHz local oscillation sources in a local oscillation source circuit, and after passing through a power divider and a frequency multiplier, the generated local oscillation signals enter the third mixer and main signals of the path of signals for mixing, and the frequency of the path of signals is adjusted to be within a frequency range of 6-18 GHz;
when the second switch and the third switch are switched to one path of 30-40GHz, signals respectively pass through a 30-40GHz band-pass filter, an eighth low-noise amplifier, a second filter, a second switch, a third mixer, a third switch, an 8-18GHz band-pass filter and a ninth low-noise amplifier and then enter an intermediate frequency processing circuit, wherein local oscillation signals of the third mixer are generated by 12GHz local oscillation sources in a local oscillation source circuit, and after passing through a power divider and a frequency multiplier, the generated local oscillation signals enter the third mixer and the main signals of the path for mixing, and the frequency of the signals is adjusted to be within a frequency range of 6-18 GHz.
Further, the intermediate frequency processing circuit comprises a fourth switch, a 6-18GHz switch filter bank and a 6-18GHz intermediate frequency processing circuit which are sequentially connected, signals output by all paths of receiving channels enter the 6-18GHz switch filter bank and the 6-18GHz intermediate frequency processing circuit after being switched by the fourth switch, and finally intermediate frequency signals are output.
Further, the receiving front end and the local oscillator source circuit are integrated multifunctional chips, and the multifunctional chips are MMIC chips of GaAs technology.
Compared with the prior art, the invention has the following remarkable advantages: (1) The system realizes the 0.38-40GHz ultra-wideband microwave signal receiving function, adopts an integrated multifunctional chip, and has the characteristics of wide frequency band and good performance consistency; (2) The frequency mixer in each path of receiving channel uniformly moves the signal frequency to the frequency band of 6-18GHz by sharing one 12GHz local vibration source, and each path of receiving channel realizes signal processing by sharing one intermediate frequency processing circuit, so that the number of local vibration sources is reduced, the circuit is simplified, the cost is low, and the integration level is high; (3) All circuits are produced and assembled by adopting an advanced micro-assembly hybrid integration process, the circuit size is reduced, and the micro-assembly hybrid integrated circuit has the characteristics of wide working frequency band, small volume, stable performance and high index consistency, and is suitable for various microwave systems such as radar, electronic reconnaissance and electronic countermeasure.
Drawings
Fig. 1 is a schematic circuit diagram of an ultra wideband superheterodyne receiving system according to the present invention.
Reference numerals in the drawings: 1. an antenna; 2. a limiter; 3. a first switch; 4. a 0.38-2GHz band pass filter; 5. a first low noise amplifier; 6. a 0.38-2GHz switching filter bank; 7. a first mixer; 8. a 12.38-14GHz band pass filter; 9. a second low noise amplifier; 10. 2-6GHz band-pass filter; 11. a third low noise amplifier; 12. 2-6GHz switching filter bank; 13. a second mixer; 14. a 14-18GHz band pass filter; 15. a fourth low noise amplifier; 16. a first 6-18GHz band pass filter; 17. a fifth low noise amplifier; 18. an 18-30GHz band pass filter; 19. a sixth low noise amplifier; 20. a first filter; 21. a second switch; 22. a third mixer; 23. a third switch; 24. a second 6-18GHz band pass filter; 25. a seventh low noise amplifier; 26. a 30-40GHz band-pass filter; 27. an eighth low noise amplifier; 28. a second filter; 29. an 8-18GHz band pass filter; 30. a ninth low noise amplifier; 31. 12GHz local vibration source; 32. a power divider; 33. a frequency multiplier; 34. a fourth switch; 35. 6-18GHz switch filter bank; 36. 6-18GHz intermediate frequency processing circuit.
Detailed Description
The invention discloses an ultra-wideband superheterodyne receiving system, which comprises a receiving front end, a 0.38-2GHz receiving channel, a 2-6GHz receiving channel, a 6-18GHz receiving channel, a 18-40GHz receiving channel, a local oscillator source circuit and an intermediate frequency processing circuit, wherein:
the receiving front end receives frequency signals within the range of 0.38-40GHz from the outside through an antenna, and switches the received signals into each path of receiving channels through a switch;
the local oscillator source circuit comprises a 12GHz local oscillator source and outputs three paths of signals through the power divider, wherein the three paths of signals are respectively output to a 0.38-2GHz receiving channel, a 2-6GHz receiving channel and an 18-40GHz receiving channel;
the frequency mixer in the three paths of receiving channels adjusts the signal frequency of the receiving channels to be within a frequency band of 6-18GHz through sharing a 12GHz local oscillation source in a local oscillation source circuit;
and the intermediate frequency processing circuit receives signals input by each path of receiving channel by adopting a change-over switch, and outputs intermediate frequency signals finally by passing each path of signals through a 6-18GHz intermediate frequency processing circuit.
Further, the system also comprises a shielding box body, the shielding box body comprises an upper cavity and a lower cavity, the receiving front end, the 0.38-2GHz receiving channel, the 2-6GHz receiving channel, the 6-18GHz receiving channel and the 18-40GHz receiving channel are arranged in the upper cavity, and the local oscillator source circuit and the intermediate frequency processing circuit are arranged in the lower cavity.
Further, the local oscillator source circuit includes a 12GHz local oscillator source 31, a power divider 32 and a frequency multiplier 33, which are sequentially connected, wherein the output of the power divider 32 provides local oscillator signals for mixers in the 0.38-2GHz receiving channel and the 2-6GHz receiving channel, and the output of the frequency multiplier 33 provides local oscillator signals for mixers in the 18-40GHz receiving channel, so as to adjust the signal frequency of the receiving channel.
Further, the receiving front end comprises an antenna 1, a limiter 2 and a first switch 3 which are sequentially connected, the antenna 1 receives signals within the range of 0.38-40GHz from the outside to the receiving front end, and the signals are limited by the limiter 2 and then are switched to each path of receiving channel at the back through the first switch 3.
Further, the 0.38-2GHz receiving channel comprises a 0.38-2GHz band-pass filter 4, a first low-noise amplifier 5, a 0.38-2GHz switch filter bank 6, a first mixer 7, a 12.38-14GHz band-pass filter 8 and a second low-noise amplifier 9 which are connected in sequence;
when the first switch 3 is switched to the 0.38-2GHz receiving channel, signals respectively pass through the 0.38-2GHz band-pass filter 4, the first low noise amplifier 5, the 0.38-2GHz switch filter bank 6, the first mixer 7, the 12.38-14GHz band-pass filter 8 and the second low noise amplifier 9 and then enter the intermediate frequency processing circuit, wherein the local oscillation signals of the first mixer 7 are generated by the 12GHz local oscillation source 31 in the local oscillation source circuit, and enter the first mixer 7 and the main signal of the receiving channel for mixing after passing through the power divider 32, and the signal frequency of the receiving channel is adjusted to be within the frequency range of 6-18 GHz.
Further, the 2-6GHz receiving channel comprises a 2-6GHz band-pass filter 10, a third low-noise amplifier 11, a 2-6GHz switch filter bank 12, a second mixer 13, a 14-18GHz band-pass filter 14 and a fourth low-noise amplifier 15 which are connected in sequence;
when the first switch 3 is switched to the 2-6GHz receiving channel, the signals respectively pass through the 2-6GHz band-pass filter 10, the third low noise amplifier 11, the 2-6GHz switch filter bank 12, the second mixer 13, the 14-18GHz band-pass filter 14 and the fourth low noise amplifier 15, and then enter the intermediate frequency processing circuit, wherein the local oscillation signal of the second mixer 13 is generated by the 12GHz local oscillation source 31 in the local oscillation source circuit, and the signals enter the second mixer 13 and the main signal of the receiving channel to mix after passing through the power divider 32, so that the signal frequency of the receiving channel is adjusted to be within the 6-18GHz frequency band.
Further, the 6-18GHz receiving channel comprises a first 6-18GHz band-pass filter 16 and a fifth low-noise amplifier 17 which are connected in sequence;
when the first switch 3 is switched to the 6-18GHz receiving channel, the signals respectively pass through the first 6-18GHz band-pass filter 16 and the fifth low-noise amplifier 17 and then enter the intermediate frequency processing circuit.
Further, the 18-40GHz receiving channel is divided into two channels for adjusting signal frequencies, one channel comprises an 18-30GHz band-pass filter 18, a sixth low noise amplifier 19, a first filter 20, a second switch 21, a third mixer 22, a third switch 23, a second 6-18GHz band-pass filter 24 and a seventh low noise amplifier 25 which are sequentially connected, and the other channel comprises a 30-40GHz band-pass filter 26, an eighth low noise amplifier 27, a second filter 28, a second switch 21, a third mixer 22, a third switch 23, an 8-18GHz band-pass filter 29 and a ninth low noise amplifier 30 which are sequentially connected;
when the first switch 3 is switched to the 18-40GHz receiving channel, the signals are divided into two paths of 18-30GHz and 30-40GHz for mixing:
when the second switch 21 and the third switch 23 are switched to one path of 18-30GHz, signals respectively pass through the 18-30GHz band-pass filter 18, the sixth low noise amplifier 19, the first filter 20, the second switch 21, the third mixer 22, the third switch 23, the second 6-18GHz band-pass filter 24 and the seventh low noise amplifier 25 and then enter an intermediate frequency processing circuit, wherein a local oscillation signal of the third mixer 22 is generated by a 12GHz local oscillation source 31 in a local oscillation source circuit, and after passing through a power divider 32 and a frequency multiplier 33, the generated local oscillation signal enters the third mixer 22 and a main signal of the path to be mixed, and the frequency of the path of signals is adjusted to be within a 6-18GHz frequency band;
when the second switch 21 and the third switch 23 are switched to one path of 30-40GHz, signals respectively pass through the 30-40GHz band-pass filter 26, the eighth low noise amplifier 27, the second filter 28, the second switch 21, the third mixer 22, the third switch 23, the 8-18GHz band-pass filter 29 and the ninth low noise amplifier 30 and then enter an intermediate frequency processing circuit, wherein the local oscillation signals of the third mixer 22 are generated by a 12GHz local oscillation source 31 in a local oscillation source circuit, and after passing through the power divider 32 and the frequency multiplier 33, the generated local oscillation signals enter the third mixer 22 and the main signals of the path to mix, and the frequency of the signals is adjusted to be within the frequency range of 6-18 GHz.
Further, the intermediate frequency processing circuit comprises a fourth switch 34, a 6-18GHz switch filter bank 35 and a 6-18GHz intermediate frequency processing circuit 36 which are sequentially connected, signals output by all paths of receiving channels enter the 6-18GHz switch filter bank 35 and the 6-18GHz intermediate frequency processing circuit 36 after being switched by the fourth switch 34, and finally intermediate frequency signals are output.
Further, the receiving front end and the local oscillator source circuit are integrated multifunctional chips, and the multifunctional chips are MMIC chips of GaAs technology.
Examples
The technical scheme of the invention is further described in detail below with reference to the attached drawings.
Referring to fig. 1, the ultra wideband superheterodyne receiving system of the present invention includes a receiving front end, a 0.38-2GHz receiving channel, a 2-6GHz receiving channel, a 6-18GHz receiving channel, a 18-40GHz receiving channel, a local oscillation source circuit, an intermediate frequency processing circuit and a shielding box body;
the receiving front end comprises an antenna 1, a limiter 2 and a first switch 3 which are sequentially connected; the 0.38-2GHz receiving channel comprises a 0.38-2GHz band-pass filter 4, a first low-noise amplifier 5, a 0.38-2GHz switch filter bank 6, a first mixer 7, a 12.38-14GHz band-pass filter 8 and a second low-noise amplifier 9 which are connected in sequence; the 2-6GHz receiving channel comprises a 2-6GHz band-pass filter 10, a third low-noise amplifier 11, a 2-6GHz switch filter bank 12, a second mixer 13, a 14-18GHz band-pass filter 14 and a fourth low-noise amplifier 15 which are connected in sequence; the 6-18GHz receiving channel comprises a first 6-18GHz band-pass filter 16 and a fifth low-noise amplifier 17 which are connected in sequence; the 18-40GHz receiving channel is divided into two channels for shifting signal frequencies, one channel comprises an 18-30GHz band-pass filter 18, a sixth low-noise amplifier 19, a first filter 20, a second switch 21, a third mixer 22, a third switch 23, a second 6-18GHz band-pass filter 24 and a seventh low-noise amplifier 25 which are sequentially connected, and the other channel comprises a 30-40GHz band-pass filter 26, an eighth low-noise amplifier 27, a second filter 28, a second switch 21, a third mixer 22, a third switch 23, an 8-18GHz band-pass filter 29 and a ninth low-noise amplifier 30 which are sequentially connected; the local oscillation source circuit comprises a 12GHz local oscillation source 31, a power divider 32 and a frequency multiplier 33 which are connected in sequence; the intermediate frequency processing circuit comprises a fourth switch 34, a 6-18GHz switch filter bank 35 and a 6-18GHz intermediate frequency processing circuit 36 which are connected in sequence;
the antenna 1 receives signals in the range of 0.38-40GHz from the outside to the receiving front end, and the signals are switched to each path of receiving channel at the back through the first switch 3 after being limited by the limiter 2; when the first switch 3 is switched to a 0.38-2GHz receiving channel, signals respectively pass through the 0.38-2GHz band-pass filter 4, the first low noise amplifier 5, the 0.38-2GHz switch filter bank 6, the first mixer 7, the 12.38-14GHz band-pass filter 8 and the second low noise amplifier 9 and then enter an intermediate frequency processing circuit, wherein local oscillation signals of the first mixer 7 are generated by a 12GHz local oscillation source 31 in a local oscillation source circuit, and enter the first mixer 7 and a main signal for mixing after passing through the power divider 32; when the first switch 3 is switched to a 2-6GHz receiving channel, signals respectively pass through a 2-6GHz band-pass filter 10, a third low noise amplifier 11, a 2-6GHz switch filter bank 12, a second mixer 13, a 14-18GHz band-pass filter 14 and a fourth low noise amplifier 15 and then enter an intermediate frequency processing circuit, wherein local oscillation signals of the second mixer 13 are generated by a 12GHz local oscillation source 31 in a local oscillation source circuit, and enter the second mixer 13 to mix with main signals after passing through a power divider 32; when the first switch 3 is switched to a 6-18GHz receiving channel, signals respectively pass through the first 6-18GHz band-pass filter 16 and the fifth low-noise amplifier 17 and then enter an intermediate frequency processing circuit; when the first switch 3 is switched to the 18-40GHz receiving channel, the signal is divided into two paths for mixing: one path of signals respectively pass through an 18-30GHz band-pass filter 18, a sixth low-noise amplifier 19, a first filter 20, a second switch 21, a third mixer 22, a third switch 23, a second 6-18GHz band-pass filter 24 and a seventh low-noise amplifier 25 and then enter an intermediate frequency processing circuit, the other path of signals respectively pass through a 30-40GHz band-pass filter 26, an eighth low-noise amplifier 27, a second filter 28, a second switch 21, a third mixer 22, a third switch 23, an 8-18GHz band-pass filter 29 and a ninth low-noise amplifier 30 and then enter the intermediate frequency processing circuit, wherein local oscillation signals of the third mixer 22 are generated by a 12GHz local oscillation source 31 in a local oscillation source circuit, and high-frequency local oscillation signals are generated after passing through a power divider 32 and a frequency multiplier 33 and then enter the third mixer 22 and a main signal for mixing; the signals output by the receiving channels enter an intermediate frequency processing circuit, are switched by a fourth switch 34, enter a 6-18GHz switch filter bank 35 and a 6-18GHz intermediate frequency processing circuit 36, and finally output intermediate frequency signals.
As a specific example, the shielding box body is provided with an upper cavity and a lower cavity, the receiving front end, the 0.38-2GHz receiving channel, the 2-6GHz receiving channel, the 6-18GHz receiving channel and the 18-40GHz receiving channel are placed in the upper cavity, and the local oscillator source circuit and the intermediate frequency processing circuit are placed in the lower cavity.
As a specific example, the antenna 1, the limiter 2 and the first switch 3 are integrated multifunctional chips 1, and the 12GHz present vibration source 31, the power divider 32 and the frequency multiplier 33 are integrated multifunctional chips 2; the multifunctional chip 1 and the multifunctional chip 2 are MMIC chips of GaAs technology and are used for realizing the amplitude consistency and the phase consistency of radio frequency signals, the input and output impedance of the multifunctional chip is 50 ohms, and no additional circuit matching is needed.
As a specific example, the local oscillation signals of the first mixer (7), the second mixer (13) and the third mixer (22) in the 0.38-2GHz receiving channel, the 2-6GHz receiving channel and the 18-40GHz receiving channel are all provided by local oscillation source circuits. The frequency conversion needs of the receiving channels can be met by only one 12GHz main vibration source 31 in the system, so that the cost is reduced, and the requirement of miniaturization of the system is met.
As a specific example, after signals in the 0.38-2GHz receiving channel, the 2-6GHz receiving channel and the 18-40GHz receiving channel are mixed, the frequencies of the signals are all moved to the frequency range of 6-18GHz, and the signals received by the 6-18GHz receiving channel are switched into an intermediate frequency processing circuit through the fourth switch 34, so that intermediate frequency signals are finally output. The intermediate frequency signal processing can be completed by only one 6-18GHz intermediate frequency processing circuit 36 in the system, so that the circuit is simplified, and the requirement of miniaturization of the system is met.
In conclusion, the ultra-wideband superheterodyne receiving system provided by the invention realizes the 0.38-40GHz ultra-wideband microwave signal receiving function. The invention adopts an integrated multifunctional chip and has the characteristics of wide frequency band and good performance consistency. All circuits are produced and assembled by adopting an advanced micro-assembly hybrid integration process, so that the circuit size is reduced. The frequency mixer in each path of receiving channel uniformly shifts the signal frequency to the frequency band of 6-18GHz by sharing one 12GHz local vibration source, thereby greatly reducing the number of local vibration sources, lowering the cost and improving the integration level. And each path of receiving channel realizes signal processing by sharing one intermediate frequency processing circuit, thereby simplifying the circuit. The invention has the characteristics of wide working frequency band, small volume, stable performance and high index consistency, is suitable for various microwave systems such as radar, electronic reconnaissance, electronic countermeasure and the like, and has very wide application prospect.
Claims (10)
1. The ultra-wideband superheterodyne receiving system is characterized by comprising a receiving front end, a 0.38-2GHz receiving channel, a 2-6GHz receiving channel, a 6-18GHz receiving channel, a 18-40GHz receiving channel, a local oscillator source circuit and an intermediate frequency processing circuit, wherein:
the receiving front end receives frequency signals within the range of 0.38-40GHz from the outside through an antenna, and switches the received signals into each path of receiving channels through a switch;
the local oscillator source circuit comprises a 12GHz local oscillator source and outputs three paths of signals through the power divider, wherein the three paths of signals are respectively output to a 0.38-2GHz receiving channel, a 2-6GHz receiving channel and an 18-40GHz receiving channel;
the frequency mixer in the three paths of receiving channels adjusts the signal frequency of the receiving channels to be within a frequency band of 6-18GHz through sharing a 12GHz local oscillation source in a local oscillation source circuit;
the intermediate frequency processing circuit receives signals input by each path of receiving channel by adopting a change-over switch, and outputs intermediate frequency signals finally by passing each path of signals through a 6-18GHz intermediate frequency processing circuit;
the 0.38-2GHz receiving channel comprises a 0.38-2GHz band-pass filter (4), a first low-noise amplifier (5), a 0.38-2GHz switch filter bank (6), a first mixer (7), a 12.38-14GHz band-pass filter (8) and a second low-noise amplifier (9) which are connected in sequence;
the 2-6GHz receiving channel comprises a 2-6GHz band-pass filter (10), a third low-noise amplifier (11), a 2-6GHz switch filter bank (12), a second mixer (13), a 14-18GHz band-pass filter (14) and a fourth low-noise amplifier (15) which are connected in sequence;
the 6-18GHz receiving channel comprises a first 6-18GHz band-pass filter (16) and a fifth low-noise amplifier (17) which are connected in sequence;
the 18-40GHz receiving channel is divided into two channels for adjusting signal frequency, one channel comprises an 18-30GHz band-pass filter (18), a sixth low-noise amplifier (19), a first filter (20), a second switch (21), a third mixer (22), a third switch (23), a second 6-18GHz band-pass filter (24) and a seventh low-noise amplifier (25) which are sequentially connected, and the other channel comprises a 30-40GHz band-pass filter (26), an eighth low-noise amplifier (27), a second filter (28), a second switch (21), a third mixer (22), a third switch (23), an 8-18GHz band-pass filter (29) and a ninth low-noise amplifier (30) which are sequentially connected.
2. The ultra-wideband superheterodyne receiving system according to claim 1, further comprising a shielding box body, wherein the shielding box body includes an upper cavity and a lower cavity, the receiving front end, the 0.38-2GHz receiving channel, the 2-6GHz receiving channel, the 6-18GHz receiving channel and the 18-40GHz receiving channel are disposed in the upper cavity, and the local oscillation source circuit and the intermediate frequency processing circuit are disposed in the lower cavity.
3. The ultra wideband superheterodyne receiving system according to claim 2, wherein the local oscillation source circuit includes a 12GHz local oscillation source (31), a power divider (32) and a frequency multiplier (33) connected in sequence, the outputs of the power divider (32) respectively provide local oscillation signals for mixers in the 0.38-2GHz receiving channel and the 2-6GHz receiving channel, and the output of the frequency multiplier (33) provides local oscillation signals for mixers in the 18-40GHz receiving channel, for adjusting the signal frequency of the receiving channel.
4. The ultra-wideband superheterodyne receiving system according to claim 3, wherein the receiving front end includes an antenna (1), a limiter (2) and a first switch (3) connected in sequence, the antenna (1) receives a signal in an external 0.38-40GHz range to the receiving front end, and the signal is limited by the limiter (2) and then is switched to each receiving channel at the back by the first switch (3).
5. The ultra wideband superheterodyne receiving system according to claim 4, wherein when the first switch (3) is switched to the 0.38-2GHz receiving channel, the signals respectively pass through the 0.38-2GHz band-pass filter (4), the first low noise amplifier (5), the 0.38-2GHz switching filter bank (6), the first mixer (7), the 12.38-14GHz band-pass filter (8), and the second low noise amplifier (9), and then enter the intermediate frequency processing circuit, wherein the local oscillation signal of the first mixer (7) is generated by the 12GHz local oscillation source (31) in the local oscillation source circuit, and then enters the first mixer (7) and the main signal of the receiving channel after passing through the power divider (32), and the signal frequency of the receiving channel is adjusted to be within the 6-18GHz frequency band.
6. The ultra wideband superheterodyne receiving system according to claim 4, wherein when the first switch (3) is switched to the 2-6GHz receiving channel, the signals respectively pass through the 2-6GHz band-pass filter (10), the third low noise amplifier (11), the 2-6GHz switch filter bank (12), the second mixer (13), the 14-18GHz band-pass filter (14), and the fourth low noise amplifier (15), and then enter the intermediate frequency processing circuit, wherein the local oscillation signal of the second mixer (13) is generated by the 12GHz local oscillation source (31) in the local oscillation source circuit, and the signals enter the second mixer (13) and the main signal of the receiving channel after passing through the power divider (32) are mixed, so that the signal frequency of the receiving channel is adjusted to be within the 6-18GHz frequency band.
7. The ultra-wideband superheterodyne receiving system according to claim 4, wherein when the first switch (3) is switched to the 6-18GHz receiving channel, the signal passes through the first 6-18GHz band-pass filter (16) and the fifth low noise amplifier (17), respectively, and then enters the intermediate frequency processing circuit.
8. The ultra wideband superheterodyne receiving system according to claim 4, characterized in that when the first switch (3) is switched to the 18-40GHz receiving channel, the signal is mixed by dividing into two paths of 18-30GHz and 30-40 GHz:
when the second switch (21) and the third switch (23) are switched to one path of 18-30GHz, signals respectively pass through an 18-30GHz band-pass filter (18), a sixth low-noise amplifier (19), a first filter (20), the second switch (21), a third mixer (22), the third switch (23), a second 6-18GHz band-pass filter (24) and a seventh low-noise amplifier (25), and then enter an intermediate frequency processing circuit, wherein local oscillation signals of the third mixer (22) are generated by a 12GHz local oscillation source (31) in a local oscillation source circuit, and after passing through a power divider (32) and a frequency multiplier (33), the generated local oscillation signals enter the third mixer (22) and a main signal of the circuit for mixing, and the frequency of the signals is adjusted to be within a frequency range of 6-18 GHz;
when the second switch (21) and the third switch (23) are switched to one path of 30-40GHz, signals respectively pass through a 30-40GHz band-pass filter (26), an eighth low-noise amplifier (27), a second filter (28), the second switch (21), a third mixer (22), the third switch (23), an 8-18GHz band-pass filter (29) and a ninth low-noise amplifier (30), and then enter an intermediate frequency processing circuit, wherein the local oscillation signals of the third mixer (22) are generated by a 12GHz local oscillation source (31) in a local oscillation source circuit, and after passing through a power divider (32) and a frequency multiplier (33), the generated local oscillation signals enter the third mixer (22) and the main signal of the path to mix, and the frequency of the local oscillation signals is adjusted to be within a frequency range of 6-18 GHz.
9. The ultra-wideband superheterodyne receiving system according to claim 4, wherein the intermediate frequency processing circuit includes a fourth switch (34), a 6-18GHz switch filter bank (35) and a 6-18GHz intermediate frequency processing circuit (36) which are sequentially connected, and the signals output by each receiving channel enter the 6-18GHz switch filter bank (35) and the 6-18GHz intermediate frequency processing circuit (36) after being switched by the fourth switch (34), and finally output intermediate frequency signals.
10. The ultra-wideband superheterodyne receiving system according to claim 4, wherein the receiving front-end and the local oscillator source circuit are integrated multifunctional chips, and the multifunctional chips are MMIC chips of GaAs technology.
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| CN113381779B (en) * | 2021-06-15 | 2023-07-21 | 中国科学院上海微系统与信息技术研究所 | Ultra wideband receiver |
| CN114221669A (en) * | 2021-12-21 | 2022-03-22 | 中国人民解放军陆军工程大学 | Pre-frequency-division superheterodyne broadband receiver and using method thereof |
| CN114614839B (en) * | 2022-03-04 | 2023-03-24 | 电子科技大学 | Multichannel Ka wave band front end subassembly |
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