7 results about "Active mixer" patented technology

The present application relates to a method and system for improving the broadband active mixer reversible design method of reversible neural network, the method comprises: obtaining the response of the broadband active mixer, wherein the response comprises the conversion gain G and the noise figure NF; inputting the response into the R-INN model, and outputting the design parameters of the broadband active mixer, wherein the design parameters comprise resistance and capacitance, the R-INN model is constructed by combining real non-volume preserving transformation with reversible neural network, the R-INN model is obtained by training the training set, and the training set comprises the design parameters in the preset range and the corresponding response. By introducing an improved reversible neural network model combined with real non-volume preserving transformation technology, the accuracy of forward prediction is optimized, and the posterior distribution of the design parameters is effectively back calculated, thereby improving the efficiency and accuracy of the optimization design of the broadband active mixer.

The embodiment of the application provides a kind of passive mixer and antenna.Belongs to communication technical field.The passive mixer includes: multi-branch microstrip line balun, mixing diode and output balun module;The first input end of multi-branch microstrip balun is the first input end of passive mixer, the second input end of multi-branch microstrip line balun is the second input end of passive mixer, the first output end of multi-branch microstrip line balun is connected with the first input end of mixing diode, the second output end of multi-branch microstrip line balun is connected with the second input end of mixing diode, the first output end of mixing diode is connected with the first input end of output balun module, the second output end of mixing diode is connected with the second input end of output balun module, and the output end of output balun module is the output end of passive mixer.The method solves the problem of high cost of active mixer transformation and poor output signal quality of passive mixer.

This invention provides a dual-channel MIMO indoor distributed network system and a dual-channel signal transceiver method. In the downlink direction, a first RRU converts the signal transmitted by the BBU into a first radio frequency (RF) signal and a first intermediate frequency (IF) signal to generate a local oscillator (LOS) signal; it outputs power; a frequency combiner combines the signal and power supply into a first signal; an antenna separates the first signal; a power-powered active mixer converts the first IF signal into a second RF signal; a power amplifier amplifies the signal power; the first RF signal and the second RF signal are transmitted; in the uplink direction, a third RF signal and a fourth RF signal are received; a power-powered low-noise amplifier amplifies the signal, converting the third RF signal into a second IF signal; the signals are combined into a second signal; a frequency combiner separates the second signal; and the first RRU converts the signal into a baseband signal and transmits it to the BBU. The solution provided by this invention can reduce the construction cost of an indoor distributed network system.

A communication system comprising a passive quadrature generator directly connected to an in-phase (I) mixer and a quadrature (Q) mixer; an I-LO amplitude detection circuit connected to the passive quadrature generator and connected to the I-mixer, and a Q-LO amplitude detection circuit connected to the passive quadrature generator and connected to the Q-mixer, the I-LO amplitude detection circuit configured to detect an I-LO amplitude, and the Q-LO amplitude detection circuit configured to detect a Q-LO amplitude; and a combining and integrating circuit configured to receive the detected I-LO amplitude and the detected Q-LO amplitude, and to generate an I-LO DC bias voltage for biasing the I mixer and a Q-LO DC bias voltage for biasing the Q mixer.

The invention provides an ultra-wideband up-conversion active mixer and a wireless communication terminal product, and relates to the technical field of radio frequency communication integrated circuits. The ultra-wideband up-conversion active mixer comprises a mixer main nuclear circuit Mixer Core, radio frequency switches RF SW and a transformer XFMR3, the radio frequency switches RF SW comprise two groups, namely a first group of radio frequency switches SP1 and SN1 and a second group of radio frequency switches SP2 and SN2; the transformer XFMR3 is a cross nested type transformer, and a low-frequency transformer and a high-frequency transformer are integrated together in a cross nested mode; when the SP1 and the SN1 are closed and the SP2 and the SN2 are disconnected, the transformer XFMR3 works at a low frequency band; and when the SP1 and the SN1 are disconnected and the SP2 and the SN2 are connected, the transformer XFMR3 works at a high frequency band. The mixer provided by the invention can ensure that the performance and the efficiency are kept relatively consistent when working in a wide frequency domain.

The signal modulation measurement system of the present application comprises: a local signal source circuit module, outputting a local signal; an envelope detection circuit module, demodulating a single tone modulated common amplitude modulation wave signal; a stereo frequency modulation demodulation circuit module, demodulating a carrier frequency fixed frequency modulation wave signal; a high-speed electronic switch circuit module, switching the input of a signal to be measured into an amplitude modulation wave demodulation channel or a frequency modulation wave demodulation channel; switching the demodulated amplitude modulation wave signal or frequency modulation wave signal into an output channel; an active mixer circuit module, completing the mixing of the input radio signal to be measured and the local signal; a passive high-pass filter circuit module, serving as a frequency selection filter after the mixing of the input single tone modulated frequency modulation signal; and a single-chip microcomputer. Advantageous effects: the device can be started to measure by one key, the modulation type identification of the signal to be measured, the demodulated waveform output, and the measurement and display of the main modulation parameters are all automatically performed without manual intervention.