In order to meet the requirements of receiving terminal with high performance for navigation,communication,phased array radar and electronic countermeasures,a broadband anti-interference receiver chip with a working frequency of 100 MHz～4 GHz is designed to improving the anti-interference,universality and miniaturization performance of the system.The receiver adopts the form of direct down conversion,composed of single-to-differential balun,passive mixer and phase shifter,which can effectively suppress the interference in band.The whole receiving channel is not blocked with strong interference,and the extremely weak useful signals can be detected,and the basic performance can be guaranteed,comparing without interference.There are some common issues in zero-Intermediate Frequency(zero-IF)receiver,such as local oscillator leakage and self-mixing,so that DC offset cancellation and local oscillator phase adjustment is added.DC bias voltage can be adjusted in a range of 5 mV.When the RF frequency changes from 100 MHz～4 GHz,the conversion gain is over 31.2 dB.
关键词
宽带抗干扰/零中频接收机/直流失调校准/IQ不平衡度/转换增益
Key words
broadband anti-interference/zero-IF receiver/DC offset cancellation/IQ imbalance/conversion gain
维普
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