23 results about "If amplifier" patented technology

The utility model relates to the technical field of millimeter wave radio frequency communication, and discloses a broadband millimeter wave dual-channel receiver, which comprises two receiving links and a power divider, each receiving link is connected with the power divider, each receiving link comprises an isolator, a frequency mixer and an intermediate frequency amplifier which are sequentially connected from input to output, one input end of the frequency mixer is connected with a frequency multiplier, and the input end of the frequency multiplier is connected with one output end of the power divider; according to the utility model, mutual interference of multiple paths of signals in a test can be effectively prevented, two paths of millimeter wave radio frequency signals can be tested and analyzed at the same time, and the device can be used for various test scenes such as down-conversion test, two paths of radio frequency signal amplitude-phase consistency test, noise coefficient test and the like.

The invention discloses an anti-interference L-band microwave remote sensing radiometer, and the radiometer comprises a radio frequency receiving assembly which comprises a miniaturized array antenna, a single-pole three-throw switch, a band-pass filter, a low-noise amplifier, a frequency mixer, a local oscillation source, an intermediate-frequency filter, an intermediate-frequency amplifier, and a detector; a signal control and acquisition assembly; a calibration component; a data processing and transmitting component; the miniaturized array antenna is used for receiving a radio frequency noise signal in a target direction; the single-pole three-throw switch is used for respectively switching and receiving the radio frequency noise signal in the target direction, a radio frequency noise signal after heat source matching and a radio frequency noise signal after cold source matching; a radio frequency noise signal is processed through a band-pass filter, a low-noise amplifier, a frequency mixer, an intermediate-frequency filter, an intermediate-frequency amplifier and a detector in sequence, and a detection signal is combined with a calibration algorithm to complete noise temperature measurement in a target direction; the data processing and transmission assembly transmits the data to the platform. The radiometer provided by the invention has strong anti-interference capability and can be used for various scenes for retrieving environmental parameters.

The invention relates to a multichannel down-conversion chip, a multichannel down-conversion circuit and a receiver, and the chip comprises a local oscillator signal processing module which accesses a local oscillator signal, carries out the amplification and power division of the local oscillator signal, and obtains a plurality of local oscillator power division signals; based on the local oscillator power division signal, phase shifting is carried out to obtain a phase-shifted local oscillator signal, and the phase-shifted local oscillator signal is input of a frequency mixer in a corresponding channel; each channel of the multi-channel module is provided with a radio frequency amplifier, a frequency mixer and an intermediate frequency amplifier which are connected in sequence, the input end of each radio frequency amplifier is used for accessing a received radio frequency signal, and the output end of each intermediate frequency amplifier is the output end of the corresponding channel; by adopting the chip, the number of components required in the down-conversion circuit can be effectively reduced, the manufacturing cost of the down-conversion circuit is reduced, and the plurality of components such as the radio frequency amplifier, the frequency mixer and the intermediate frequency amplifier are integrated in the same chip, so that the size of the down-conversion circuit can be reduced, and the miniaturization requirement can be met.

This invention discloses a pilot-type carrier phase recovery circuit and a reverse antenna array system, belonging to the field of 5G millimeter-wave communication. The pilot-type carrier phase recovery circuit includes a digital phase detector, a quadrature mixer, a quadrature voltage-controlled oscillator, a low-pass filter, a high-pass filter, a polyphase filter, a loop filter, a first intermediate frequency amplifier, a second intermediate frequency amplifier, a first shaping circuit, and a second shaping circuit. Applied to a reverse antenna array system, this invention performs carrier phase recovery on the data signal and pilot signal output from the receiver, separating the data signal without spatial phase information and the spatial phase information used for reverse transmission. This invention enables high-order modulation full-duplex communication and real-time tracking of moving targets, featuring high integration, small area, high communication speed, and strong anti-interference capability.

The utility model provides a linear frequency modulation transmit-receive assembly with a silence function, which relates to the technical field of signal processing, and comprises a transmitting link, a receiving link and an auxiliary signal processing module, a voltage-controlled oscillator circuit of the transmitting link generates a microwave signal, and finally an isolator circuit transmits the signal. Signal processing and controllable silence of a transmitting path are ensured; and the receiving link carries out front-end processing on the received signal and carries out frequency mixing on the received signal and the local oscillator signal distributed by the directional coupler circuit to generate a beat signal, and the beat signal is further amplified by the intermediate frequency amplifier and then output. According to the utility model, silent signals are received through the enabling ends of the first power conversion chip A1 and the second power conversion chip A2, and power supply of the coupler circuit and the attenuator circuit of the transmitting link is directly cut off, so that compared with a traditional signal path cut-off mode, signal leakage or residual radiation can be thoroughly avoided, and the transmission efficiency is improved. The transmitting terminal is ensured to completely stop working in a silent state, and the requirement of a high-concealment scene is met.

The present invention discloses a CMOS integrated millimeter wave self-matching receiver front-end circuit, comprising: a first orthogonal coupler, a second orthogonal coupler, a first passive mixer, a second passive mixer, a first first-stage amplifier, a first second-stage amplifier, a second first-stage amplifier, a second second-stage amplifier, a local oscillator, and an input terminal V RF , input LO IN The first and second stage amplifiers of the present invention are intermediate frequency amplifiers, which use a derivative superposition structure to achieve a high linearity of 4 to 12 dBm. Both the input and output use an orthogonal coupler structure to achieve an input and output port impedance self-matching effect, ensuring good matching between the input and output ends.

The invention discloses a broadband high image rejection millimeter wave receiver capable of automatically detecting phase errors and performing feedforward calibration. The broadband high image rejection millimeter wave receiver comprises a low noise amplifier, an orthogonal signal generator, a phase discriminator, a first frequency mixer, a second frequency mixer, a first intermediate frequency amplifier, a second intermediate frequency amplifier and an orthogonal-to-differential synthesizer. According to the broadband high image rejection millimeter wave receiver capable of automatically detecting the phase error and performing feed-forward calibration, the received radio frequency signal can be processed, and the first differential output signal with the image signal suppressed is obtained, so that the influence of image interference is reduced; the structure of the broadband high image rejection millimeter wave receiver capable of automatically detecting the phase error and performing feed-forward calibration faces broadband application, and a high image rejection ratio can be maintained in the whole millimeter wave frequency band, so that the broadband high image rejection millimeter wave receiver is suitable for broadband millimeter wave application. The method is widely applied to the technical field of communication.

The invention discloses a receiver system with automatic gain control, comprising an FPGA chip, a detection voltage ADC, a first radio frequency feedforward AGC module, a second radio frequency feedforward AGC module, and an intermediate frequency feedforward AGC module; the first radio frequency feedforward AGC module comprises a first digitally controlled attenuator, a first coupler, a first low noise amplifier, and a first detector; the second radio frequency feedforward AGC module comprises a second digitally controlled attenuator, a second coupler, a second low noise amplifier, and a second detector; the intermediate frequency feedforward AGC module comprises a third digitally controlled attenuator, a third coupler, a first intermediate frequency amplifier, and a third detector; the detector is used to transmit a detected analog voltage signal to the detection voltage ADC, the detection voltage ADC converts the analog voltage signal into a digital voltage signal, and transmits it to the FPGA chip for processing; the FPGA chip generates a gain allocation strategy according to the received digital voltage signal, and simultaneously controls the first digitally controlled attenuator, the second digitally controlled attenuator, and the third digitally controlled attenuator, so as to realize automatic gain control.

In one embodiment, a method includes: setting, via a controller of a receiver, a plurality of gain components of the receiver for a maximum gain setting for an automatic gain control (AGC) sensitivity (SENS) mode; receiving, in a controller of the receiver, an indication that a power level of an intermediate frequency (IF) signal measured at an output of an IF amplifier of the receiver exceeds a first threshold; and transitioning from an AGC SENS mode to an AGC adjacent channel interference (ACI) mode in response to the indication that the power level of the IF signal exceeds the first threshold.

A unique low power dual mode amplifier system for a receiver front end or transmitter is described. The invention is configured to utilize a common gain block element for amplification of both the RF-IF signal components found within a super heterodyne receiver. Replacement of separate gain stages for RF and IF components by a single common gain block offers a substantial power consumption reduction for a receiver or transmitter design. Implementation of the invention is possible using commonly found well known RF or IF circuitry elements. The invention combines several of the basic functions necessary to build a receiver or transmitter including frequency band selection, signal amplification and frequency conversion into a simple topology. An integrated circuit and discrete component type example implementations are provided.

The invention belongs to the technical field of integrated circuits, and particularly relates to an anti-radiation receiver chip design based on a two-dimensional wafer-level material. The receiver chip is composed of an antenna array element, a radio frequency switch, an N-path filter based on a time modulation array, a frequency mixer and an intermediate frequency amplifier, and N channel signal input is achieved. The antenna array receives a radio frequency signal, a specific signal is selected based on a differential structure N-path filter of a time modulation array, and other frequency components and noise mixed into an effective input signal are suppressed. According to the radiation-proof receiver chip based on the two-dimensional wafer-level material, a wafer-level two-dimensional semiconductor material is used as a channel, and a high-impedance radiation material is used as a substrate. By virtue of a unique single-layer or few-layer structure and inherent stable chemical bonding, the two-dimensional material shows remarkable tolerance when being irradiated by high-energy particles, so that the formation of radiation-induced defects is effectively inhibited. The long-time stability of the electrical performance of the chip is ensured, and the anti-radiation capability of the circuit is effectively improved. The radiation-proof receiver chip based on the two-dimensional wafer-level material can be widely applied to w satellite communication and manned spaceflight, and has positive influence on exploration of space full of high-energy particle radiation. Due to the excellent radiation resistance, the two-dimensional material has huge potential in application in an extreme environment.

The application provides a receiver unit of a far field monitoring device of a II instrument landing equipment heading beacon, which comprises an input radio frequency amplifier connected with a frequency synthesizer, the frequency synthesizer being connected with a mixer, the mixer being further connected with an intermediate frequency amplification circuit, the intermediate frequency amplification circuit being further connected with a detection circuit, the mixer comprising a first mixer, an input end of the first mixer being connected with an output end of the amplifier; the intermediate frequency amplification circuit comprising a band pass filter and a first intermediate frequency amplifier, wherein an input end of the band pass filter is connected with an output end of the first mixer, and an output end of the band pass filter is connected with an input end of the first intermediate frequency amplifier; and the detection circuit comprising an AGC controller, a low pass detector, an absolute value detection circuit, a second intermediate frequency amplifier, a second mixer and a local oscillator.

In one embodiment, a method includes: setting, via a controller of a receiver, a plurality of gain components of the receiver for a maximum gain setting for an automatic gain control (AGC) sensitivity (SENS) mode; receiving, in a controller of the receiver, an indication that a power level of an intermediate frequency (IF) signal measured at an output of an IF amplifier of the receiver exceeds a first threshold; and transitioning from an AGC SENS mode to an AGC adjacent channel interference (ACI) mode in response to the indication that the power level of the IF signal exceeds the first threshold.

This invention provides an analog array antenna beamformer and its operation method. The analog array antenna beamformer includes an intermediate frequency (IF) amplifier circuit, multiple local oscillators, multiple mixers, multiple radio frequency (RF) amplifier circuits, and a frequency locking circuit. The IF amplifier circuit receives a baseband signal to provide an IF signal. Several local oscillators are connected together at their power supply or ground terminals to generate frequency synchronization. Simultaneously, a phase difference is formed, providing multiple local frequency signals with the same frequency but different phases. The mixers receive one of the IF signal and the local frequency signals respectively to provide multiple mixed signals. The multiple RF amplifier circuits receive the mixed signals to provide multiple RF signals with the same frequency but different phases to their respective antennas. The RF signals radiated by each antenna have the same frequency but different phases, thus forming directional RF signal transmission or reception. The frequency locking circuit locks the frequency of only one local frequency signal.

The invention discloses a radar communication machine based on EBPSK / MPPSK modulation, which comprises a transmitter power amplifier, a receiver intermediate frequency amplifier, a transceiving switch and an antenna / feeder line, and further comprises a data frame memory, an EBPSK / MPPSK signal modulator, an impact filter, a matched filter, two time gating gates and a radar signal detector, and a communication data demodulator. The data frame memory processes the randomized communication data code stream, and sends the randomized communication data code stream to the matched filter; and the EBPSK / MPPSK signal modulator processes a carrier signal of the radar transmitter by using the data in the data frame memory, and sends the carrier signal to the transmitter power amplifier. Under different combinations of the framework, the single-path EBPSK / MPPSK signal modem and the matched filter, the radar communication integrated equipment function can be obtained by using the same system.

The invention provides a laser distance measuring device, a distance measuring instrument and a distance measuring method.The laser distance measuring device comprises a processor, a first pulse generator, a second pulse generator, a laser receiving and transmitting module, an intermediate frequency amplifier and a direct current removing module, and the processor is used for controlling the first pulse generator to output a first pulse signal; the second pulse generator is controlled to output a second pulse signal; the laser transceiver module is used for emitting pulse laser to the measured object based on the first pulse signal to obtain a target intermediate frequency signal used for participating in distance measurement calculation; the direct-current removal module is used for outputting a target electric signal to the intermediate-frequency amplifier so as to eliminate a direct-current component in the intermediate-frequency amplifier; the intermediate-frequency amplifier is used for amplifying the target intermediate-frequency signal under the condition of eliminating the direct-current component; the processor is also used for measuring and calculating the distance of the measured object according to the amplified target intermediate frequency signal. The laser ranging device can improve the accuracy of laser ranging.

The invention relates to the technical field of radio frequency, in particular to a microwave frequency converter control circuit which comprises a radio frequency link and a local oscillator link. The radio frequency link comprises an intermediate frequency amplification module, a frequency mixer and a radio frequency amplification module which are connected in sequence, and a local oscillation port of the frequency mixer is connected with the local oscillation link; the intermediate frequency amplification module comprises two stages of intermediate frequency amplifiers connected in series, and a voltage control type variable attenuator connected in series between the two stages of intermediate frequency amplifiers; the variable attenuator is connected with a temperature compensation control circuit; the radio frequency amplification module comprises two stages of radio frequency amplifiers which are connected in series, and fixed attenuators are respectively connected in series between the input end of the radio frequency amplification module and the two adjacent stages of radio frequency amplifiers. The method has the broadband gain adjustment capability, and has the characteristics of a high-precision temperature compensation mechanism and excellent port matching performance.

Disclosed in the present application is a millimetre wave up-down conversion module, comprising an intermediate-frequency transceiving change-over switch and a radio frequency transceiving change-over switch, wherein there are two links, i.e., an up-conversion link and a down-conversion link, between the two switches, the up-conversion link sequentially comprises an intermediate-frequency amplifier, a hybrid coupler and a quadrature up-converter, and the down-conversion link comprises a down-converter. Additionally, a local oscillator circuit provides a local oscillator signal to the quadrature up-converter and the down-converter. Additionally, a radio frequency Balun transformer II is connected to the radio frequency transceiving change-over switch. The millimetre wave up-down conversion module has two operating modes, i.e., a transmitting mode and a receiving mode, wherein in the transmitting mode, a signal travels through the up-conversion link, and in the receiving mode, the signal travels through the down-conversion link. In the present application, the up-down conversion module has excellent image rejection ratio, low local oscillator leakage, excellent broadband matching, small area and low design complexity.

The present invention discloses an improved intercom, which mainly improves the intermediate frequency demodulation circuit and audio processing circuit of the receiving circuit. In the intermediate frequency demodulation circuit, a DSP demodulator module is used to replace the intermediate frequency amplifier, intermediate frequency demodulator IC, two-way ceramic filters and ceramic discriminator in the prior art; in the audio processing circuit, an audio processing module is used to replace the audio buffer amplifier circuit, audio high-pass filter circuit and audio low-pass filter circuit in the prior art. A digital filter as a second intermediate frequency filter is integrated inside the DSP demodulator module, and no additional ceramic filter is required. Not only are there fewer discrete components and a small size, but the digital filter also has a strong out-of-band suppression capability. A digital filter is integrated in the audio processing module, and the digital filter can filter the sub-audio signals below 300Hz more thoroughly and cleanly than the analog filter, avoiding the crosstalk of the sub-audio, and has a higher signal-to-noise ratio than the analog filter.

The application discloses an anti-interference L-band microwave remote sensing radiometer, which comprises the following components: a radio frequency receiving component, a signal control and collection component, a calibration component, a data processing and transmission component, and a miniaturized array antenna, a single-pole three-throw switch, a band-pass filter, a low-noise amplifier, a mixer, a local oscillator source, an intermediate frequency filter, an intermediate frequency amplifier and a detector; the miniaturized array antenna is used for receiving a radio frequency noise signal in a target direction; the single-pole three-throw switch is used for switching the radio frequency noise signal in the target direction, a radio frequency noise signal matched with a heat source and a radio frequency noise signal matched with a cold source respectively; the radio frequency noise signal is sequentially processed by the band-pass filter, the low-noise amplifier, the mixer, the intermediate frequency filter, the intermediate frequency amplifier and the detector; a detection signal is combined with a calibration algorithm to complete noise temperature measurement in the target direction; and the data processing and transmission component is transmitted to a platform; the radiometer has strong anti-interference capability and can be used in various scenes for searching environmental parameters.

The utility model relates to the technical field of amplifiers, and discloses a high-stability KU-waveband tuner structure, which comprises a structure main body, a shell, a PCB-A board, a PCB-B board, a compartment A, a compartment B and a head F. The PCB-A board comprises a substrate A and a device group A arranged on the substrate A; the PCB-B board comprises a substrate B and a device group B arranged on the substrate B; the device group A comprises an antenna, a first-stage low-noise amplifier LNA01, a second-stage low-noise amplifier LNA02, a third-stage low-noise amplifier LNA03, a comb band-pass filter BPF1, an active Mixer, a first-stage intermediate-frequency amplifier AMP1 and a second-stage intermediate-frequency amplifier AMP2; and the device group B comprises a crystal oscillator connecting end Fref, a phase discriminator, a Low-pass filter, a voltage-controlled oscillator (VCO), an N frequency division counter N Counter, a frequency multiplier FX2 and a low noise amplifier LNA11. Through the cooperation of the PCB-A board and the PCB-B board, high phase noise can be achieved, the frequency stability is improved, and the use requirements of users with high requirements can be met.

In one embodiment, a method comprises: setting a plurality of amplifier components of the receiver, via a controller of a receiver, to a maximum gain setting for an automatic gain control (AGC) sensitivity (SENS) mode; receiving an indication in a controller of the receiver that a level of an intermediate frequency (IF) signal measured at an output of an IF amplifier of the receiver exceeds a first threshold; and switching from an AGC SENS mode to an AGC adjacent channel interference (ACI) mode in response to the indication that the power level of the IF signal exceeds the first threshold.

The name of the invention is gain control for optimizing sensitivity and blocking performance. In one embodiment, a method includes setting, via a controller of a receiver, a plurality of gain components of the receiver for maximum gain setting for an automatic gain control (AGC) sensitivity (SENS) mode; receiving, in a controller of the receiver, an indication that a power level of an intermediate frequency (IF) signal measured at an output of an IF amplifier of the receiver exceeds a first threshold; and transitioning from an AGC SENS mode to an AGC adjacent channel interference (ACI) mode in response to an indication that the power level of the IF signal exceeds a first threshold.