一种适用于低中频和零中频GPS接收机的CMOS混频器  

A CMOS Mixer for Low IF and Zero IF GPS Receiver

作　　者：武振宇[1] 马成炎[2] 叶甜春[1] 庄海孝[1] 

机构地区：[1]中国科学院微电子研究所,北京100029 [2]杭州中科微电子有限公司,杭州310053

出　　处：《微电子学》2010年第4期481-484,490,共5页Microelectronics

基　　金：国家科技重大专项基金资助项目(2009ZX01031-002-008)

摘　　要：基于0.18μm RF CMOS工艺,设计了一种可用于低中频和零中频GPS接收机的CMOS正交混频器。通过固定电流注入技术,减小了混频器的噪声系数。将混频器的开关管偏置在线性区,可进一步降低混频器的1/f噪声,适用于零中频接收机。在1.8 V的工作电压下,由Cadence Spectre RF仿真可得,混频器的转换增益为7.1 dB,而4 MHz和20 kHz中频输出的SSB噪声系数分别为8.7 dB和12.3 dB。Based on 0.18 μm RF CMOS process,a CMOS quadrature mixer was designed for low and zero IF GPS receiver.By using static current bleeding technique,noise figure of the mixer was reduced.Switching transistors of the mixer were biased in linear region to further reduce 1/f noise for zero IF receiver.The mixer was simulated with Spectre RF of Cadence at 1.8 V supply voltage.Results showed that the mixer had a conversion gain of 7.1 dB,with SSB noise figure of 8.7 dB and 12.3 dB at 4 MHz and 20 kHz IF output,respectively.

关 键 词：CMOS 零中频 混频器 电流注入 

分 类 号：TN773[电子电信—电路与系统]