CN112929042A - Ku-waveband broadband miniaturized variable-frequency receiving device and using method - Google Patents
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Abstract
The invention discloses a Ku-band broadband miniaturized variable-frequency receiving device and a using method thereof, and the Ku-band miniaturized variable-frequency receiving device comprises an amplitude limiter, a numerical control attenuator, a low-noise amplifier, an MEMS band-pass filter, an anti-aliasing filter, an intermediate frequency amplifier, a low-pass filter, a switch filter bank, a decoding driver, a first variable-frequency multifunctional chip and a second variable-frequency multifunctional chip.
Description
Technical Field
The invention relates to the technical field of variable frequency receiving devices, in particular to a Ku-band broadband miniaturized variable frequency receiving device and a using method thereof.
Background
The receiving device is used as an important component of equipment such as radar, communication, navigation and the like, and has the main functions of amplifying, frequency converting, filtering and AGC (automatic gain control) on an input broadband radio frequency signal, outputting an intermediate frequency signal with lower frequency and narrower bandwidth, and sending the intermediate frequency signal into an AD (analog-to-digital) converter for sampling. With the development of phased array radar technology and MIMO communication technology, the number of channels of a receiving device is greatly increased, the working bandwidth is continuously increased, the requirement for the inter-channel amplitude-phase consistency is continuously improved, and meanwhile, the size of the receiving device is required to be continuously reduced, and the research and development period and the cost are required to be continuously reduced.
Conventional receiving devices include low noise amplifiers, preselection filters, mixers, intermediate frequency amplifiers, intermediate frequency filters, digitally controlled attenuators, local oscillation buffer amplifiers, and the like. The preselection filter is generally a band-pass filter, and the bandwidth of the preselection filter cannot be too wide, otherwise, a large amount of high-order intermodulation signals of the mixer fall into an intermediate frequency band, and cause interference to normal signals, so that the bandwidth of the filter limits the working bandwidth of the frequency conversion receiving device. Each functional module of the traditional frequency conversion receiving device generally adopts a microwave monolithic circuit or a hybrid integrated module, and has single function; anti-aliasing filters typically employ an LC filter module consisting of discrete components inside. The two factors lead the traditional variable frequency receiving device to have larger volume and can not adapt to application scenes such as phased array radar and the like with more channels, complex functions and high integration level.
Disclosure of Invention
The invention aims to provide a Ku-band broadband miniaturized variable frequency receiving device, which solves the problems of large volume and small bandwidth of the conventional variable frequency receiving device.
A Ku waveband broadband miniaturization frequency conversion receiving device comprises an amplitude limiter, a numerical control attenuator, a low-noise amplifier, an MEMS band-pass filter, an anti-aliasing filter, an intermediate frequency amplifier, a low-pass filter, a switch filter bank, a decoding driver, a first frequency conversion multifunctional chip and a second frequency conversion multifunctional chip;
the input end of the amplitude limiter is the radio frequency input end of the frequency conversion receiving device, the output end of the amplitude limiter is connected with the radio frequency input end of the numerical control attenuator, the radio frequency output end of the numerical control attenuator is connected with the input end of the low noise amplifier, the control end of the numerical control attenuator is connected with the radio frequency AGC control signal input end of the frequency conversion receiving device, the output end of the low noise amplifier is connected with the radio frequency input end of the switch filter bank, the radio frequency output end of the switch filter bank is connected with the radio frequency input end of the first frequency conversion multifunctional chip, the control end of the switch filter bank is connected with the control signal output end of the decoding driver, the control signal input end of the decoding driver is connected with the frequency band selection signal input end of the frequency conversion receiving device, the radio frequency output end of the first frequency conversion multifunctional chip is connected with the input end of the, the control end of the first frequency conversion multifunctional chip is connected with an intermediate frequency AGC control signal input end of the frequency conversion receiving device, the output end of the MEMS band-pass filter is connected with the radio frequency input end of the second frequency conversion multifunctional chip, the radio frequency output end of the second frequency conversion multifunctional chip is connected with the input end of the anti-aliasing filter, the local oscillation input end of the second frequency conversion multifunctional chip is connected with two local oscillation signal input ends of the frequency conversion receiving device, the control end of the second frequency conversion multifunctional chip is connected with two intermediate frequency AGC control signal input ends of the frequency conversion receiving device, the output end of the anti-aliasing filter is connected with the input end of the intermediate frequency amplifier, the output end of the intermediate frequency amplifier is connected with the input end of the low-pass filter, and the.
As a further optimization, the switch filter bank adopts a single-chip switch filter bank chip.
As further optimization, the first frequency conversion multifunctional chip and the second frequency conversion multifunctional chip adopt frequency conversion multifunctional chips which are integrated with multiple functions by single chips.
As further optimization, the MEMS band-pass filter adopts an MEMS technology LC filter chip.
As a further optimization, the power range of the Ku-band radio frequency input signal is-71 dBm- +6 dBm.
The invention also provides a using method of the Ku-band broadband miniaturized variable frequency receiving device, which comprises the following steps:
the input Ku wave band radio frequency signal firstly enters an amplitude limiter to prevent a high-power signal from burning a post-stage circuit.
After the radio frequency signal is output from the amplitude limiter, the radio frequency signal is input into the numerical control attenuator, when the power of the input radio frequency signal enables a post-stage circuit to be saturated, the numerical control attenuator plays a role in controlling under the action of an external AGC control signal, the input radio frequency signal is attenuated and then is sent into the low-noise amplifier to be amplified, and the numerical control attenuator does not play a role in controlling under other conditions.
The radio frequency signal after low noise amplification is input into the switch filter bank, after the frequency band selection signal input from outside is input into the decoding driver, the signal is decoded, buffered and converted into the logic level of 0V/-5V, and then the switch filter bank is controlled, so that the switch filter bank selects the corresponding working frequency band and suppresses the stray signal outside the working frequency band.
After a radio frequency signal output by the switch filter bank is sent to the first frequency conversion multifunctional chip, the radio frequency signal is firstly mixed with a local oscillator signal which is subjected to buffering amplification to generate an intermediate frequency signal, and the intermediate frequency signal is filtered, amplified and attenuated under the action of an AGC control signal which is input externally in the first frequency conversion multifunctional chip and then output to the MEMS band-pass filter.
An intermediate frequency signal is output to the second frequency conversion multifunctional chip after being subjected to the suppression of stray signals outside the intermediate frequency bandwidth, such as external interference signals, mixing stray signals, harmonic waves of an amplifier and the like by the MEMS band-pass filter.
After entering the second frequency conversion multifunctional chip, an intermediate frequency signal is firstly mixed with a buffered and amplified two local oscillator signals to generate two intermediate frequency signals, and the two intermediate frequency signals are filtered, amplified and attenuated under the action of an externally input AGC control signal in the second frequency conversion multifunctional chip and then output to an anti-aliasing filter.
The anti-aliasing filter inhibits signals outside the bandwidth of the intermediate frequency signals, and avoids interference caused by aliasing of signals in other Nyquist zones into signals in a target Nyquist zone in the undersampling process.
After the intermediate frequency signal is subjected to anti-aliasing filtering, the intermediate frequency signal is amplified by an intermediate frequency amplifier and subjected to harmonic wave signal suppression by a low-pass filter, and the harmonic wave signal is output to the outside of the frequency conversion device.
The technical scheme provided by the invention realizes the miniaturization design of the receiving device by applying the frequency conversion multifunctional chip, adopting the full bare chip integrated MCM process and adopting the miniaturized MEMS process LC anti-aliasing filter chip, realizes the preselection filtering of broadband radio-frequency signals by adopting the single-chip integrated switch filter group chip, and solves the problems of large volume, multiple types of devices and the like of the traditional broadband receiving device.
Drawings
Fig. 1 is a schematic structural diagram of a Ku-band broadband miniaturized frequency conversion receiving device.
Reference numerals: 1. an amplitude limiter; 2. a numerical control attenuator; 3. a low noise amplifier; 4. a switch filter bank; 5. a decode driver; 6. a first variable frequency multifunctional chip; 7. a MEMS band-pass filter; 8. a second variable frequency multifunctional chip; 9. an anti-aliasing filter; 10. an intermediate frequency amplifier; 11. a low pass filter.
Detailed Description
The following detailed description of the present invention is provided in conjunction with the accompanying drawings, and specific details such as specific system configurations, model numbers, technical parameters, etc., set forth in the following description are set forth merely to provide a better understanding of the present invention, and are not intended to limit the scope of the invention. In addition, those that should be known and understood by those skilled in the art will not be described in detail herein.
As shown in fig. 1, a specific embodiment of a Ku-band broadband miniaturized frequency conversion receiving device includes a limiter 1, a digitally controlled attenuator 2, a low noise amplifier 3, a MEMS band-pass filter 7, an anti-aliasing filter 9, an intermediate frequency amplifier 10, a low-pass filter 11, a switch filter bank 4, a decoding driver 5, a first frequency conversion multifunctional chip 6, and a second frequency conversion multifunctional chip 8.
The input end of the amplitude limiter 1 is the radio frequency input end of the frequency conversion receiving device, the output end of the amplitude limiter 1 is connected with the radio frequency input end of the numerical control attenuator 2, the radio frequency output end of the numerical control attenuator 2 is connected with the input end of the low noise amplifier 3, the control end of the numerical control attenuator 2 is connected with the radio frequency AGC control signal input end of the frequency conversion receiving device, the output end of the low noise amplifier 3 is connected with the radio frequency input end of the switch filter bank 4, the radio frequency output end of the switch filter bank 4 is connected with the radio frequency input end of the first frequency conversion multifunctional chip 6, the control end of the switch filter bank 4 is connected with the control signal output end of the decoding driver 5, the control signal input end of the decoding driver 5 is connected with the frequency band selection signal input end of the frequency conversion receiving device, the radio frequency, the local oscillation input end of the first frequency conversion multifunctional chip 6 is connected with a local oscillation signal input end of the frequency conversion receiving device, the control end of the first frequency conversion multifunctional chip 6 is connected with an intermediate frequency AGC control signal input end of the frequency conversion receiving device, the output end of the MEMS band-pass filter 7 is connected with the radio frequency input end of the second frequency conversion multifunctional chip 8, the radio frequency output end of the second frequency conversion multifunctional chip 8 is connected with the input end of the anti-aliasing filter 9, the local oscillation input end of the second frequency conversion multifunctional chip 8 is connected with two local oscillation signal input ends of the frequency conversion receiving device, the control end of the second frequency conversion multifunctional chip 8 is connected with two intermediate frequency AGC control signal input ends of the frequency conversion receiving device, the output end of the anti-aliasing filter 9 is connected with the input end of the intermediate frequency amplifier 10, the output end of the intermediate frequency amplifier 10 is connected with the input end of the.
When the specific embodiment works normally, the power range of the Ku-band radio-frequency input signal is-71 dBm- +6dBm, the input Ku-band radio-frequency signal firstly enters the amplitude limiter 1, and the high-power signal is prevented from burning a post-stage circuit. The radio frequency signal is output from the amplitude limiter 1 and then input into the numerical control attenuator 2, when the power of the input radio frequency signal enables a post-stage circuit to be saturated, the numerical control attenuator 2 plays a role in controlling under the action of an external AGC control signal, and the input radio frequency signal is attenuated and then sent into the low noise amplifier 3 for amplification; otherwise, the numerical control attenuator 2 is not activated. The radio frequency signal after low noise amplification is input into the switch filter bank 4, the frequency band selection signal input from outside is input into the decoding driver 5, and then the signal is decoded, buffered and converted into the logic level of 0V/-5V, and then the switch filter bank 4 is controlled to select the corresponding working frequency band and suppress the stray signal outside the working frequency band. After the radio frequency signal output by the switch filter bank 4 is sent to the first frequency conversion multifunctional chip 6, the radio frequency signal is firstly mixed with a local oscillator signal which is subjected to buffering amplification to generate an intermediate frequency signal, and the intermediate frequency signal is filtered, amplified and attenuated under the action of an AGC control signal which is input externally in the first frequency conversion multifunctional chip 6 and then output to the MEMS band-pass filter 7. An intermediate frequency signal is output to the second frequency conversion multifunctional chip 8 after being subjected to the suppression of stray signals outside the intermediate frequency bandwidth, such as external interference signals, mixed stray signals, harmonic waves of an amplifier and the like by the MEMS band-pass filter 7. After entering the second frequency conversion multifunctional chip 8, an intermediate frequency signal is first mixed with a buffered and amplified two local oscillator signal to generate a two intermediate frequency signal, and the two intermediate frequency signal is filtered, amplified and attenuated under the action of an externally input AGC control signal in the second frequency conversion multifunctional chip 8 and then output to the anti-aliasing filter 9. The anti-aliasing filter 9 suppresses signals outside the bandwidth of the intermediate frequency signal, and avoids interference caused by aliasing of signals in other Nyquist zones into signals in a target Nyquist zone in the undersampling process. After the intermediate frequency signal is subjected to anti-aliasing filtering, the intermediate frequency signal is amplified by an intermediate frequency amplifier 10 and subjected to harmonic suppression by a low-pass filter 11, and the harmonic signal is output to the outside of the frequency conversion device.
The beneficial effects obtained by the invention are as follows:
the monolithic switch filter bank chip is adopted to filter the input radio frequency signal in a segmented manner, so that the working bandwidth of the receiving device is expanded while the interference signal which can generate a high-order intermodulation product is ensured to be filtered, and the miniaturization requirement is met.
The frequency conversion multifunctional chip with multiple functions and the MEMS technology LC filter chip are integrated on a single chip, so that the peripheral circuit is further simplified, and the volume of the frequency conversion receiving device is reduced.
The invention also adopts a standardized and modularized design method, can be used for forming a miniaturized modular multi-channel receiving assembly, and solves the problems of poor maintainability, high cost, poor consistency among channels and the like of the traditional multi-channel receiving assembly.
Claims (6)
1. The utility model provides a miniaturized frequency conversion receiving arrangement of Ku wave band broadband which characterized in that: the device comprises an amplitude limiter (1), a numerical control attenuator (2), a low-noise amplifier (3), an MEMS (micro electro mechanical systems) band-pass filter (7), an anti-aliasing filter (9), an intermediate frequency amplifier (10), a low-pass filter (11), a switch filter bank (4), a decoding driver (5), a first frequency conversion multifunctional chip (6) and a second frequency conversion multifunctional chip (8);
the input end of the amplitude limiter (1) is the radio frequency input end of a variable frequency receiving device, the output end of the amplitude limiter (1) is connected with the radio frequency input end of a numerical control attenuator (2), the radio frequency output end of the numerical control attenuator (2) is connected with the input end of a low noise amplifier (3), the control end of the numerical control attenuator (2) is connected with the radio frequency AGC control signal input end of the variable frequency receiving device, the output end of the low noise amplifier (3) is connected with the radio frequency input end of a switch filter bank (4), the radio frequency output end of the switch filter bank (4) is connected with the radio frequency input end of a first variable frequency multifunctional chip (6), the control end of the switch filter bank (4) is connected with the control signal output end of a decoding driver (5), the control signal input end of the decoding driver (5) is connected with the frequency band selection signal input end of the variable frequency receiving device, the radio frequency output end of the first variable frequency The local oscillation input end of the first frequency conversion multifunctional chip (6) is connected with a local oscillation signal input end of the frequency conversion receiving device, the control end of the first frequency conversion multifunctional chip (6) is connected with an intermediate frequency AGC control signal input end of the frequency conversion receiving device, the output end of the MEMS band-pass filter (7) is connected with the radio frequency input end of the second frequency conversion multifunctional chip (8), the radio frequency output end of the second frequency conversion multifunctional chip (8) is connected with the input end of the anti-aliasing filter (9), the local oscillation input end of the second frequency conversion multifunctional chip (8) is connected with the two local oscillation signal input ends of the frequency conversion receiving device, the control end of the second frequency conversion multifunctional chip (8) is connected with the two intermediate frequency AGC control signal input ends of the frequency conversion receiving device, the output end of the anti-aliasing filter (9) is connected with the input end of the intermediate frequency amplifier (10), and the output end of the intermediate frequency amplifier (, the output end of the low-pass filter (11) is the intermediate frequency signal output end of the frequency conversion receiving device.
2. The Ku-band broadband miniaturized frequency conversion receiving device according to claim 1, wherein the switch filter bank (4) is a monolithic switch filter bank chip.
3. The Ku-band broadband miniaturized frequency conversion receiving device according to claim 2, wherein the first frequency conversion multifunctional chip (6) and the second frequency conversion multifunctional chip (8) are frequency conversion multifunctional chips monolithically integrated with multiple functions.
4. The Ku-band broadband miniaturized frequency conversion receiving device according to claim 3, wherein the MEMS band-pass filter (7) adopts an MEMS technology LC filter chip.
5. The Ku-band broadband miniaturized frequency conversion receiving device according to any one of claims 1 to 4, wherein the power range of the Ku-band radio frequency input signal is-71 dBm to +6 dBm.
6. The use method of the Ku-band broadband miniaturized frequency conversion receiving device is characterized in that the Ku-band broadband miniaturized frequency conversion receiving device as claimed in any one of claims 1 to 5 is adopted, and the method comprises the following steps:
the input Ku wave band radio frequency signal firstly enters an amplitude limiter (1) to prevent a high-power signal from burning a post-stage circuit;
after being output from the amplitude limiter (1), the radio frequency signal is input into the numerical control attenuator (2), when the power of the input radio frequency signal enables a post-stage circuit to be saturated, the numerical control attenuator (2) plays a role in controlling under the action of an external AGC control signal, and the input radio frequency signal is transmitted into the low-noise amplifier (3) for amplification after being attenuated; under other conditions, the numerical control attenuator (2) is not started to control;
the radio frequency signal after low noise amplification is input into a switch filter bank (4), after an externally input frequency band selection signal is input into a decoding driver (5), the radio frequency signal is decoded, buffered and converted into a logic level of 0V/-5V, and then the switch filter bank (4) is controlled to select a corresponding working frequency band and suppress stray signals outside the working frequency band;
after a radio frequency signal output by the switch filter bank (4) is sent to the first frequency conversion multifunctional chip (6), the radio frequency signal is firstly mixed with a local oscillator signal which is buffered and amplified to generate an intermediate frequency signal, and the intermediate frequency signal is filtered, amplified and attenuated under the action of an AGC control signal which is input externally in the first frequency conversion multifunctional chip (6) and then output to the MEMS band-pass filter (7);
an intermediate frequency signal is output to a second frequency conversion multifunctional chip (8) after an external interference signal, a mixing stray, an amplifier harmonic wave and other stray signals outside the intermediate frequency bandwidth are suppressed by an MEMS band-pass filter (7);
after entering a second frequency conversion multifunctional chip (8), an intermediate frequency signal is firstly mixed with a buffered and amplified second local oscillator signal to generate a second intermediate frequency signal, and the second intermediate frequency signal is filtered, amplified and attenuated under the action of an AGC control signal input externally in the second frequency conversion multifunctional chip (8) and then output to an anti-aliasing filter (9);
an anti-aliasing filter (9) inhibits signals outside the bandwidth of the intermediate frequency signals, and avoids interference caused by aliasing of signals in other Nyquist zones into signals in a target Nyquist zone in the undersampling process;
after the intermediate frequency signal is subjected to anti-aliasing filtering, the intermediate frequency signal is amplified by an intermediate frequency amplifier (10), a harmonic signal is suppressed by a low-pass filter (11), and the harmonic signal is output to the outside of the frequency conversion device.
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