GPS接收机中的下变频混频器的设计与实现  

Design and realization of a down-conversion mixer in GPS receiver

作　　者：江炜[1] 周健军[1] 

机构地区：[1]上海交通大学微电子学院,上海200240

出　　处：《电子测量技术》2008年第12期159-161,176,共4页Electronic Measurement Technology

基　　金：上海市科委浦江人才计划资助(07pj14060)

摘　　要：本文设计了一个应用于GPS接收机的下变频混频器。该混频器的RF,LO,IF信号的频率分别是1.576GHz,1.572GHz和4MHz。混频器的供电电压为3V。基于SMIC 0.18μm CMOS RF工艺模型,采用Cadence SpectreRF仿真器进行仿真,取得的转换增益(conversion gain)为15.19dB,噪声系数(NF)为16.5dB,三阶输入交调点(ⅡP3)为-0.535dBm,消耗的DC电流为5.4mA。混频器的版图总面积为420μm×220μm。提取寄生参数,后仿真的结果为:转换增益为15.66dB,NF为17.53dB,ⅡP3为-3.2dBm,消耗的DC电流为5.3mA。A down-conversion CMOS mixer applied to GPS receiver is designed and realized. Frequencies of RF, LO and IF signals are respectively 1. 576 GHz, 1. 572 GHz and 4 MHz. The simulation using the model of SMIC 0. 18 μm CMOS RF technology shows that the described mixer has achieved a conversion gain of 15. 19 dB,a NF of 16. 5 dB, and an IIP3 of --0. 575 dBm. The total dissipated DC current is 5.4 mA. The post simulation shows that the mixer has achieved a conversion gain of 15. 66 dB, a NF of 17. 53 dB, and an IIP3 of --3.2 dBm, and its total dissipated DC current is 5. 3 mA.

关 键 词：混频器 GILBERT单元 电荷注入 

分 类 号：TN773[电子电信—电路与系统]