Broadband low-frequency-conversion-loss double-balanced mixer chip based on GaAs technology

Abstract

A broadband low-frequency-conversion-loss double-balanced mixer chip based on a GaAs technology is characterized in that a local oscillator signal is input from two parallel local oscillator baluns, and the local oscillator signal is converted into four balanced output ports which are respectively connected with four local oscillator impedance matching networks and are used for two Schottky diode mixing cores; meanwhile, a radio frequency signal is input from two radio frequency baluns which are connected in parallel, and the radio frequency signal is converted into four balanced output ports which are respectively connected with four radio frequency impedance matching networks and are used for two Schottky diode frequency mixing cores; an intermediate frequency signal is led out from secondary center taps of the two radio frequency baluns and is output through an intermediate frequency filter network; the structure has the advantages that a frequency mixing product is only one fourth of a single-end frequency mixer product, stray output of the frequency mixer is greatly reduced, the double-balun structure is combined with the local oscillator and radio frequency impedance matching technology, the frequency band width is improved. Meanwhile, frequency conversion loss is reduced, and isolation and linearity are correspondingly improved.

Description

【Technical field】 [0001] The invention belongs to the technical field of radio frequency integrated circuits, and relates to a GaAs technology-based double-balanced mixer chip with broadband and low conversion loss. 【Background technique】 [0002] Driven by the rapid development of 5G communication, the application of multi-channel technology has rapidly expanded the number of components in radio frequency microwave circuits. The original lumped circuit design ideas have been difficult to adapt to the development of future communication technologies. In , the conversion between signal frequencies has always been a very important core issue. [0003] In the communication system, the mixer is one of the core devices in the microwave transceiver system, and its performance will directly affect the performance of the entire system. It is realized by the nonlinear characteristics of active / passive devices to generate input frequency The sum and difference frequency components of...

AI Technical Summary

Problems solved by technology

One input signal of a single-balanced mixer is a differential signal. In theory, its frequency conversion loss will be improved compared with that of a single-ended mixer, and the interference signal in its output signal will be reduced by half. The circuit contains two mixers tube; the two input signals of the double-balanced mixer are differential signals, and its advantages are: it can suppress the even harmonic components of the local oscillator signal and the radio frequency signal, and there is good isolation between the ports of the mixer, There are four mixer tubes in the circuit. From the perspective of frequency conversion loss, the performance of the double-balanced mixer is significantly improved compared with the single-balanced mixer, but the bandwidth of the traditional double-balanced mixer is narrow, and The problem of relatively poor frequency conversion loss needs to be improved through some improved structures

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