一种有源双平衡微波混频电路的设计与分析

摘要

The performance of local oscillator anti-phase balance mixer is analyzed by using the system anal-ysis method.Then,a double balance mixer is designed by adopting the LT5522 chip.Finally,the practical-ity circuits of a receiver are tested and analyzed.A mirror frequency suppression filter is configured at the input end of the mixer,and a low noise amplifier is configured at the input port.By doing so,the whole down-mixer circuits observe a better noise factor,and this noise factor is less than 1 .2 dB of the whole cir-cuits to satisfy the needs.%采用系统分析的方法,从微波混频器基本原理入手,分析了本振反相型平衡混频器性能参数；在此基础上,采用芯片LT5522设计了一种有源双平衡微波混频器；对该接收机实物电路进行测试分析。设计的混频器在输入端添加了镜像抑制滤波器,在前级添加了低噪声放大器,因而使整个下变频电路具有良好的噪声系数,链路噪声系数小于1.2 dB,结果满足要求。