高本振中频隔离超宽带混频芯片设计  

Design of ultra-broadband mixer chip with high LO-IF isolation

作　　者：韩星宇 年夫顺 代秀 张婷 Han Xingyu;Nian Fushun;Dai Xiu;Zhang Ting(School of Instrument and Electronics,North University of China,Taiyuan 030051,China;CETC Instruments Co.,Ltd.,Qingdao 266555,China)

机构地区：[1]中北大学仪器与电子学院,太原030051 [2]中电科思仪科技股份有限公司,青岛266555

出　　处：《电子测量与仪器学报》2024年第3期86-93,共8页Journal of Electronic Measurement and Instrumentation

摘　　要：超宽带谐波混频器一般采用本振中频双工器,从本振通路引出中频信号。但是当本振频率和中频频率相近或者重叠时,难以实现本振到中频高隔离。本文采用了不同于常用谐波混频器结构,用射频中频双工器替代了本振中频双工器,从射频通路引出中频信号,设计了30~110 GHz 4次谐波混频芯片,并进行了封装实验测试。经测试,4次谐波混频器射频频率30~110 GHz,中频频率1 GHz的变频损耗小于25 dB,DC-15 GHz本振和中频端口间的隔离度可达30 dB,固定本振时中频频率DC-7 GHz变频损耗小于28 dB。因此,本设计可有效隔离频率相近的本振和中频信号,为拓宽中频带宽提供可能。Ultra-broadband harmonic mixers generally use LO-IF duplexers to extract IF signals from the LO circuit.However,when the LO frequency and the IF frequency are similar or overlap,it is difficult to achieve high LO-IF isolation.In this paper,RF-IF duplexer is used to replace the LO-IF duplexer,different from the common harmonic mixer structure,and IF signal is extracted from the RF circuit.A 30~110 GHz fourth harmonic mixer chip is designed and tested.After the four harmonic mixer testing,RF sweep frequency range 30~110 GHz,frequency conversion loss is less than 25 dB at IF frequency 1 GHz.In DC-15 GHz,the isolation between the LO and the IF ports is up to 30 dB.When the local vibration is fixed,the frequency conversion loss of IF sweep frequency DC-7 GHz is less than 28 dB.Therefore,this design can effectively isolate LO and IF signals with similar frequencies,and it is possible to broaden the IF broadband.

关 键 词：混频器 谐波混频 反向二极管对 超宽带 

分 类 号：TH89[机械工程—仪器科学与技术] TN773.2[机械工程—精密仪器及机械]