9 results about "Down conversion mixer" patented technology

The utility model relates to a broadband anti-burning anti-crosstalk annular low noise amplifier assembly, which comprises an input end, a low noise amplifier assembly and an output end, the input end is connected with a band-pass filter, and the output end is connected with a low-pass filter; the band-pass filter is connected with the low-noise amplifier assembly, and the low-pass filter is connected with the low-noise amplifier assembly through the down-conversion mixer; the low-noise amplifier assembly is of a multi-stage cascade system structure and comprises a front-stage broadband low-noise amplifier, a rear-stage SPDT radio frequency switch, a biasing circuit with temperature and voltage compensation effects and an ESD protection circuit. The front-stage broadband low-noise amplifier is cascaded with the rear-stage SPDT radio frequency switch; the front-stage broadband low-noise amplifier and the rear-stage SPDT radio frequency switch are respectively cascaded with a biasing circuit with temperature and voltage compensation effects; the utility model has the advantages of reasonable structure, strong anti-interference performance, safety and reliability, and can avoid burnout.

The application discloses an anti-interference reconfigurable frequency hopping pattern communication device and method, relates to the technical field of wireless communication devices, and comprises a baseband module and an intermediate frequency processing module based on a field programmable gate array (FPGA), an AD conversion module, a DA conversion module, an up-conversion frequency mixer and a down-conversion frequency mixer connected with the baseband module and the intermediate frequency processing module based on the FPGA, and the device constitutes a transmitting chain and a receiving chain; the application has the beneficial effects that flexible frequency hopping pattern loading can be realized to adapt to communication between different devices, and the robustness of signal receiving is remarkably improved.

The application provides a kind of analog signal conditioning circuit and radar signal simulator system, wherein the analog signal conditioning circuit includes signal receiving unit, for receiving target signal;Down conversion unit, for by down conversion mixer, target signal is down converted from first frequency range to second frequency range;Analog transmission unit, for the target signal through radio frequency cable is divided into two target sub signals;Up conversion unit, for by up conversion mixer, target sub signal after adjusting signal intensity is up converted to first frequency range;Signal transmitting unit, for two target sub signals are combined into one mixed signal;Wherein the input frequency of the local oscillator signal of down conversion mixer and each up conversion mixer is derived from the output frequency of the corresponding set phase-locked loop, and the reference frequency of several phase-locked loops is derived from the same reference source, so that different echo intensity and different distance of micro-motion target are simulated, and the reliability of radar detection is improved.

A mixer may include a negative resistor, a transformer, a switching stage, and an input stage. The input stage may receive a radio frequency signal and output a current corresponding to a voltage of the radio frequency signal. The switching stage may switch based on a local oscillation signal. The mixer may be a down-conversion mixer that converts high-frequency millimeter-wave signals to an intermediate frequency.

Carrier aggregation (CA) may cause interference between operation on two or more carriers within a user equipment (UE). This interference can degrade signal quality on one or more of the carriers involved in the carrier aggregation, which may be referred to as "desensing" one or more carriers. One or more isolating buffers may be coupled at a down-conversion mixer at a point where the down-conversion mixer receives a signal from a transmission line for isolating the transmission line from other transmission lines. The isolating buffer may reduce the effect of interference between multiple transmission lines carrying different carriers during carrier aggregation (CA) operation. The isolating buffers may be used in an RF transceiver supporting both 5G sub-7 GHz and 5G mmWave wireless networks and carrier aggregation across sub-7 GHz and mmWave bands.

The utility model discloses a radio frequency signal receiver module and a wireless microwave gateway, and belongs to the technical field of wireless monitoring. A radio frequency signal receiver module comprises a passive down-conversion mixer, a band-pass filter, a first low-pass filter and an analog-to-digital converter which are connected in sequence. The wireless microwave gateway provided by the utility model comprises the radio frequency signal receiver module. According to the passive tag return signal receiver module of the utility model, the passive down-conversion mixer is matched with the band-pass filter to eliminate a large direct-current component generated after a leakage carrier is subjected to down-conversion, so that the influence on a post-stage circuit of the receiver module can be reduced, and therefore, the sensitivity of the receiving module can be improved; the receiver module is prevented from being blocked, the obtained intermediate frequency signal has high fidelity, and the demodulation precision is greatly improved.

The application discloses a kind of ultra-wideband step frequency radio frequency front ends with high-order harmonic suppression, comprising: transmitter and receiver, high-frequency local oscillator passes through driver amplifier and band-pass filter, into power divider, one-way output signal as the intermediate frequency signal of down-conversion mixer, with step frequency signal is mixed, through low-pass filter to take lower sideband signal, then through power amplifier to transmitting antenna;In receiver, the signal of receiving antenna sequentially passes through low-noise amplifier and band-pass filter, into mixer, with coupled step frequency signal is mixed, take the upper sideband signal in output signal, after driver amplifier and band-pass filter, with the other way signal of power divider output IQ mixing is carried out, and AD sampling is carried out to I channel and Q channel respectively.According to the application, without switch filter group, the effective suppression of the high-order harmonic of transmitting signal can be realized, while reducing the complexity of system, the cost is effectively reduced.

The invention discloses communication equipment and method for anti-interference reconfigurable frequency hopping patterns, and relates to the technical field of wireless communication equipment, comprising a baseband module based on a field programmable gate array (FPGA) and an intermediate frequency processing module, the AD conversion module, the DA conversion module, the up-conversion mixer and the down-conversion mixer are connected with the FPGA, and the equipment forms a transmitting link and a receiving link. The method has the advantages that flexible frequency hopping pattern loading can be achieved so as to adapt to communication between different devices, and signal receiving robustness is remarkably improved.