CN118157699B - 4-Channel broadband variable-frequency receiving module - Google Patents
4-Channel broadband variable-frequency receiving module Download PDFInfo
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- CN118157699B CN118157699B CN202410564522.8A CN202410564522A CN118157699B CN 118157699 B CN118157699 B CN 118157699B CN 202410564522 A CN202410564522 A CN 202410564522A CN 118157699 B CN118157699 B CN 118157699B
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Abstract
The invention discloses a 4-channel broadband variable frequency receiving module, which mainly solves the problems of complex technical scheme, high cost, difficult integration and miniaturization. The module comprises a frequency generating unit for generating local oscillation signals, 4 paths of signal receiving channels and a power divider group which is connected with the frequency generating unit and used for sending the local oscillation signals into the 4 paths of signal receiving channels after power dividing; wherein, the 4 paths of signal receiving channels have the same structure. According to the variable frequency receiving module, the signal receiving channel is improved, and the switch filter bank and the frequency converter are designed in an integrated manner, so that the design is greatly simplified, the cost is reduced, the difficulty of the production and assembly process is reduced, the consistency of the 4-channel is improved, the difficulty of the micro-assembly production and assembly process of the 4-channel is reduced, and the reliability is improved.
Description
Technical Field
The invention belongs to the technical field of microwave communication, and particularly relates to a 4-channel broadband variable frequency receiving module.
Background
With the development of modern communication, the use requirement on microwave frequency is further improved, and the ultra-wideband receiver can accurately monitor fact signals, so that the ultra-wideband receiver is widely applied to multiple fields of radar, communication, electronic countermeasure and the like, and is mainly used for processing signals in various frequency bands received by an antenna, filtering, frequency conversion and amplification are carried out on the received signals so as to facilitate signal digital processing, and the multi-channel receiver can receive the same signal in different directions so as to position, measure directions and the like on the signals.
The scheme of the existing single-channel variable-frequency receiving module is shown in fig. 1, the multi-channel variable-frequency receiving module has the same signal receiving channel structure, and local oscillation signals are sent to each receiving channel after being divided into power. The defects of the prior art are: firstly, need to carry out the frequency conversion for three times, secondly need a plurality of wave filter banks, thirdly, instantaneous bandwidth only 500MHz, and it is not up to 1GHz to the scheme is more complicated, and is with high costs, difficult integrated and miniaturized.
Disclosure of Invention
The invention aims to provide a 4-channel broadband variable frequency receiving module, which mainly solves the problems of complex technical scheme, high cost, difficult integration and miniaturization in the prior art.
In order to achieve the above purpose, the technical scheme adopted by the invention is as follows:
A4-channel broadband variable frequency receiving module comprises a frequency generating unit for generating local oscillation signals, 4-channel signal receiving channels and a power divider group which is connected with the frequency generating unit and used for sending the local oscillation signals into the 4-channel signal receiving channels after power division; wherein the 4 paths of signal receiving channels have the same structure;
the signal receiving channel comprises a switch filter bank, a low noise amplifier, a numerical control attenuator, a first frequency converter, a first intermediate frequency filter, a first intermediate frequency amplifier, a second frequency converter, a second intermediate frequency filter and a second intermediate frequency amplifier which are connected in sequence; the first frequency converter and the second frequency converter are connected with the power divider group.
Further, in the invention, the power divider group comprises a first power divider and a second power divider which are connected with the frequency generating unit; the third power divider and the fourth power divider are connected with the first power divider and are used for inputting the signals after power division into the first frequency converter of the 4-channel signal receiving channel; and the fifth power divider and the sixth power divider are connected with the second power divider and are used for inputting the signals after power division into the second frequency converter of the 4-channel signal receiving channel.
Further, in the invention, the switch filter group comprises a first single-pole three-throw switch with a fixed end as an input end, a second single-pole three-throw switch connected with three free ends of the first single-pole three-throw switch, a third single-pole three-throw switch and a first filter, and second filters to fourth filters connected with three free ends of the second single-pole three-throw switch; fifth to seventh filters connected to three free ends of the third single-pole three-throw switch; the three free ends are connected with the fourth single-pole three-throw switch at the other end of the second filter to the fourth filter, the three free ends are connected with the fifth single-pole three-throw switch at the other end of the fifth filter to the seventh filter, and the three free ends are respectively connected with the other end of the first filter, the fixed end of the fourth single-pole three-throw switch and the sixth single-pole three-throw switch at the fixed end of the fifth single-pole three-throw switch.
Further, in the invention, the first frequency converter comprises a first SPDT switch, a second SPDT switch, a receiving amplifier A1, a transmitting amplifier A2, a local oscillation amplifier A3, a first mixer and a low-pass filter; the fixed end of the first SPDT switch is used as a signal input end, the input end of the receiving amplifier A1 is connected with one free end of the first SPDT switch, and the output end of the receiving amplifier A1 is connected with one free end of the second SPDT switch; the output end of the transmitting amplifier A2 is connected with the other free end of the first SPDT switch, and the input end of the receiving amplifier A1 is connected with the other free end of the second SPDT switch; the input end of the first mixer is connected with the fixed end of the second SPDT switch, the local oscillation input end of the first mixer is connected with the output end of the local oscillation amplifier A3, the input end of the local oscillation amplifier A3 is connected with the power divider of the corresponding signal receiving channel, and the low-pass filter is connected with the output end of the first mixer.
Further, in the invention, the second frequency converter comprises a local oscillator drive amplifier, a radio frequency band-pass filter, a second mixer and an intermediate frequency low-pass filter; the radio frequency band-pass filter is connected with the input end of the second mixer, and the output end of the local oscillator drive amplifier is connected with the local oscillator input end of the second mixer; the intermediate frequency low-pass filter is connected with the output end of the second mixer.
Compared with the prior art, the invention has the following beneficial effects:
According to the variable frequency receiving module, the signal receiving channel is improved, and the switch filter bank and the frequency converter are designed in an integrated manner, so that the design is greatly simplified, the cost is reduced, the difficulty of the production and assembly process is reduced, the consistency of the 4-channel is improved, the difficulty of the micro-assembly production and assembly process of the 4-channel is reduced, and the reliability is improved.
Drawings
Fig. 1 is a schematic diagram of a signal receiving channel structure in the prior art.
Fig. 2 is a schematic diagram of the overall structure of the present invention.
Fig. 3 is a schematic diagram of a signal receiving channel structure according to an embodiment of the invention.
Fig. 4 is a schematic diagram of a switch filter bank according to an embodiment of the invention.
Fig. 5 is a schematic structural diagram of a first frequency converter according to an embodiment of the invention.
Fig. 6 is a schematic structural diagram of a second frequency converter according to an embodiment of the invention.
Detailed Description
The invention will be further illustrated by the following description and examples, which include but are not limited to the following examples.
As shown in fig. 2, the 4-channel broadband variable frequency receiving module disclosed by the invention comprises a frequency generating unit for generating local oscillation signals, 4-channel signal receiving channels and a power divider group connected with the frequency generating unit and used for sending the local oscillation signals into the 4-channel signal receiving channels after power division; wherein, the 4 paths of signal receiving channels have the same structure.
As shown in fig. 3, the signal receiving channel comprises a switch filter bank, a low noise amplifier, a digital control attenuator, a first frequency converter, a first intermediate frequency filter, a first intermediate frequency amplifier, a second frequency converter, a second intermediate frequency filter and a second intermediate frequency amplifier which are connected in sequence; the first frequency converter and the second frequency converter are connected with the power divider group. The frequency conversion receiving channel has the main function of realizing 4 paths of 2-18 GHz broadband frequency conversion receiving. The method comprises the steps of 2-18 GHz switch filtering, low noise amplification, digital control attenuation of a receiving link, and output of 1.8GHz intermediate frequency through twice frequency conversion.
In this embodiment, the power divider group includes a first power divider and a second power divider connected to the frequency generating unit; the third power divider and the fourth power divider are connected with the first power divider and are used for inputting the signals after power division into the first frequency converter of the 4-channel signal receiving channel; and the fifth power divider and the sixth power divider are connected with the second power divider and are used for inputting the signals after power division into the second frequency converter of the 4-channel signal receiving channel. The frequency generation unit is used for generating local oscillation signals, the local oscillation signals are subjected to power division by the power dividers, the working frequency range of one local oscillation signal of the first frequency converter is 24-40 GHz, and the working frequency of two local oscillation signals of the second frequency converter is 23.8GHz.
As shown in fig. 4, in this embodiment, the switch filter bank includes a first single-pole three-throw switch with a fixed end as an input end, a second single-pole three-throw switch connected to three free ends of the first single-pole three-throw switch, a third single-pole three-throw switch, and a first filter, and second to fourth filters connected to three free ends of the second single-pole three-throw switch; fifth to seventh filters connected to three free ends of the third single-pole three-throw switch; the three free ends are connected with the fourth single-pole three-throw switch at the other end of the second filter to the fourth filter, the three free ends are connected with the fifth single-pole three-throw switch at the other end of the fifth filter to the seventh filter, and the three free ends are respectively connected with the other end of the first filter, the fixed end of the fourth single-pole three-throw switch and the sixth single-pole three-throw switch at the fixed end of the fifth single-pole three-throw switch. The working frequency range of the switch filter bank is 1.9-18 GHz, the switch filter bank is divided into 7 channels for band-pass filtering selection, and the channel frequencies are respectively: 1.9-3.2GHz, 2.2-3.7GHz, 2.7-4.6GHz, 3.6-6.1GHz, 5.1-8.9GHz, 7.9-13.8GHz and 12.8-18GHz; the frequencies of the band pass filters overlap by 1GHz. The working voltage of the chip is-5V, and the working current is 9mA.
As shown in fig. 5, in this embodiment, the first frequency converter includes a first SPDT switch, a second SPDT switch, a receiving amplifier A1, a transmitting amplifier A2, a local oscillator amplifier A3, a first mixer, and a low-pass filter; the fixed end of the first SPDT switch is used as a signal input end, the input end of the receiving amplifier A1 is connected with one free end of the first SPDT switch, and the output end of the receiving amplifier A1 is connected with one free end of the second SPDT switch; the output end of the transmitting amplifier A2 is connected with the other free end of the first SPDT switch, and the input end of the receiving amplifier A1 is connected with the other free end of the second SPDT switch; the input end of the first mixer is connected with the fixed end of the second SPDT switch, the local oscillation input end of the first mixer is connected with the output end of the local oscillation amplifier A3, the input end of the local oscillation amplifier A3 is connected with the power divider of the corresponding signal receiving channel, and the low-pass filter is connected with the output end of the first mixer.
As shown in fig. 6, in this embodiment, the second frequency converter includes a local oscillator drive amplifier, a radio frequency band-pass filter, a second mixer, and an intermediate frequency low-pass filter; the radio frequency band-pass filter is connected with the input end of the second mixer, and the output end of the local oscillator drive amplifier is connected with the local oscillator input end of the second mixer; the intermediate frequency low-pass filter is connected with the output end of the second mixer. The frequency converter has high isolation, the radio frequency/local oscillation frequency is 20-23 GHz, and the intermediate frequency is DC-3 GHz.
In the embodiment, the low noise amplifier adopts HGC462, which is a GAAS PHEMT MMIC low noise medium power amplifier, the working frequency range of the chip is 2-18 GHz, the small signal gain is 20dB, the chip has P-1dB output capability of 21dBm, the working voltage is +5V, and the working current is 120mA. HGC462 has good gain flatness.+ -. 0.4dB. The chip via metallization ensures good grounding, and the back surface is metallized, so that the method is suitable for eutectic sintering or conductive adhesive bonding processes.
The numerical control attenuator adopts HGC212, which is a GAAS PHEMT MMIC numerical control attenuator chip, the working frequency range of the chip is 0.1-18 GHz, the full positive control is realized, a 6-bit TTL level conversion circuit is integrated, the attenuation range is 0.5 dB-31.5 dB, the working voltage is +5V, and the working current is 6mA. The gain of the transmitting link and the receiving link can be conveniently adjusted through the chip.
In this embodiment, the first intermediate frequency filter adopts a ceramic microstrip parallel coupled line bandpass filter, and the filter adopts a ceramic thin film technology, which has the characteristics of small volume, high performance and high reliability, and is assembled by adopting a micro-assembly bonding technology. The passband frequency of the filter is 21.5-22.5 GHz.
In this embodiment, the first intermediate frequency amplifier uses VD7035, where VD7035 is a low noise amplifier chip, and works at 20-34GHz, and the single power supply works at +5v. There are two modes of operation for this amplifier: in low power mode, 23.5dB of gain and 10dBm of P-1dB of output power can be provided, and the noise figure is typically 2.2dB; in the high power mode, a gain of 23.0dB and a P-1dB output power of 13dBm may be provided, with a noise figure of typically 2.4dB. The low-noise amplifier chip adopts an on-chip metallized through hole process, does not need extra grounding measures, and is simple and convenient to use; the back of the chip is metallized, and the chip is suitable for conducting resin bonding or eutectic sintering technology.
In the embodiment, the second intermediate frequency filter adopts the LTCC band-pass filter BFCN5032-1800A01, and the filter adopts a passive integrated multilayer LTCC process, so that the filter has the characteristics of small volume, high performance and high reliability, and can be surface-mounted. The passband frequency of the filter is 1300-2300MHz.
In this embodiment, the second intermediate frequency amplifier employs a cascade of two stages of amplifiers, first a first stage of low noise amplification, followed by a second stage of drive amplification.
The first-stage amplifier adopts GS1201, which is a GAAS PHEMT MMIC low-noise amplifier with high gain and extremely low noise coefficient, the working frequency covers 0.1-4.0GHz, +5V single-source power supply is adopted, the typical small-signal gain is 29dB, the noise coefficient is 0.6dB, and the P-1dB output capability of 13dBm is achieved. The inside of the chip is free of a blocking capacitor, and the blocking capacitor is required to be added outside.
The second stage amplifier adopts GS1310, which is a GAAS PHEMT MMIC low-noise amplifier, the working frequency covers 0.05-5.0GHz, a +5V single-source power supply is adopted, the typical small signal gain is 19.5dB, the noise coefficient is 1.5dB, and the second stage amplifier has the P-1dB output capability of 16.5 dBm. The chip is internally provided with no choke inductance and no blocking capacitance, and the choke inductance and the blocking capacitance are required to be externally added.
In the embodiment, GS7182 is adopted for all power splitters, which is a GaAs MMIC 0 DEG two-way power splitter chip, the working frequency covers 18-50GHz, the typical insertion loss in the frequency band is 0.5dB, and the isolation is 25dB. The GS7182 adopts a bilateral symmetry design, and the amplitude and the phase of two power dividing branches are completely consistent.
Through the design, the frequency conversion receiving module disclosed by the invention has the advantages that the signal receiving channel is improved, the switch filter bank and the frequency converter are integrated, the design is greatly simplified, the cost is reduced, the difficulty of the production and assembly process is reduced, the consistency of the 4-channel is improved, the difficulty of the micro-assembly production and assembly process of the 4-channel is reduced, and the reliability is improved.
The above embodiment is only one of the preferred embodiments of the present invention, and should not be used to limit the scope of the present invention, but all the insubstantial modifications or color changes made in the main design concept and spirit of the present invention are still consistent with the present invention, and all the technical problems to be solved are included in the scope of the present invention.
Claims (3)
1. The 4-channel broadband variable frequency receiving module is characterized by comprising a frequency generating unit for generating local oscillation signals, 4-channel signal receiving channels and a power divider group which is connected with the frequency generating unit and used for sending the local oscillation signals into the 4-channel signal receiving channels after power dividing; wherein the 4 paths of signal receiving channels have the same structure;
The signal receiving channel comprises a switch filter bank, a low noise amplifier, a numerical control attenuator, a first frequency converter, a first intermediate frequency filter, a first intermediate frequency amplifier, a second frequency converter, a second intermediate frequency filter and a second intermediate frequency amplifier which are connected in sequence; the first frequency converter and the second frequency converter are connected with the power divider group;
The first frequency converter comprises a first SPDT switch, a second SPDT switch, a receiving amplifier A1, a transmitting amplifier A2, a local oscillator amplifier A3, a first mixer and a low-pass filter; the fixed end of the first SPDT switch is used as a signal input end, the input end of the receiving amplifier A1 is connected with one free end of the first SPDT switch, and the output end of the receiving amplifier A1 is connected with one free end of the second SPDT switch; the output end of the transmitting amplifier A2 is connected with the other free end of the first SPDT switch, and the input end of the receiving amplifier A1 is connected with the other free end of the second SPDT switch; the input end of the first mixer is connected with the fixed end of the second SPDT switch, the local oscillation input end of the first mixer is connected with the output end of the local oscillation amplifier A3, the input end of the local oscillation amplifier A3 is connected with the power divider of the corresponding signal receiving channel, and the low-pass filter is connected with the output end of the first mixer;
the second frequency converter comprises a local oscillator drive amplifier, a radio frequency band-pass filter, a second mixer and an intermediate frequency low-pass filter; the radio frequency band-pass filter is connected with the input end of the second mixer, and the output end of the local oscillator drive amplifier is connected with the local oscillator input end of the second mixer; the intermediate frequency low-pass filter is connected with the output end of the second mixer.
2. The 4-channel broadband variable frequency receiving module according to claim 1, wherein the power divider group comprises a first power divider and a second power divider connected with the frequency generating unit; the third power divider and the fourth power divider are connected with the first power divider and are used for inputting the signals after power division into the first frequency converter of the 4-channel signal receiving channel; and the fifth power divider and the sixth power divider are connected with the second power divider and are used for inputting the signals after power division into the second frequency converter of the 4-channel signal receiving channel.
3. The 4-channel broadband variable frequency receiving module according to claim 2, wherein the switch filter bank comprises a first single-pole three-throw switch with a fixed end as an input end, a second single-pole three-throw switch connected to three free ends of the first single-pole three-throw switch, a third single-pole three-throw switch and a first filter, and second to fourth filters connected to three free ends of the second single-pole three-throw switch; fifth to seventh filters connected to three free ends of the third single-pole three-throw switch; the three free ends are connected with the fourth single-pole three-throw switch at the other end of the second filter to the fourth filter, the three free ends are connected with the fifth single-pole three-throw switch at the other end of the fifth filter to the seventh filter, and the three free ends are respectively connected with the other end of the first filter, the fixed end of the fourth single-pole three-throw switch and the sixth single-pole three-throw switch at the fixed end of the fifth single-pole three-throw switch.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202410564522.8A CN118157699B (en) | 2024-05-09 | 4-Channel broadband variable-frequency receiving module |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202410564522.8A CN118157699B (en) | 2024-05-09 | 4-Channel broadband variable-frequency receiving module |
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| CN118157699A CN118157699A (en) | 2024-06-07 |
| CN118157699B true CN118157699B (en) | 2024-07-26 |
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108206673A (en) * | 2016-12-20 | 2018-06-26 | 中国航天科工集团八五研究所 | A kind of 6GHz is to 18GHz broadbands frequency-variable module |
| CN213521865U (en) * | 2020-12-23 | 2021-06-22 | 四川中科微芯电子有限公司 | Frequency conversion receiving system |
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108206673A (en) * | 2016-12-20 | 2018-06-26 | 中国航天科工集团八五研究所 | A kind of 6GHz is to 18GHz broadbands frequency-variable module |
| CN213521865U (en) * | 2020-12-23 | 2021-06-22 | 四川中科微芯电子有限公司 | Frequency conversion receiving system |
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