A DC-Offset Cancellation Scheme in a Direct-Conversion Receiver for IEEE 802.11a WLAN  

一种解决无线局域网直下变频接收机直流漂移的方法(英文)

作　　者：许奇明[1] 石寅[1] 高鹏[1] 胡雪青[1] 颜峻[1] 徐化[1] 陈弘达[1] 

机构地区：[1]中国科学院半导体研究所,北京100083

出　　处：《Journal of Semiconductors》2006年第4期653-657,共5页半导体学报（英文版）

基　　金：国家自然科学基金资助项目(批准号:90207008,60536030)~~

摘　　要：A DC-offset cancellation scheme in a 5GHz direct-conversion receiver compliant with the IEEE 802.11a wireless LAN standard is presented. An analog feedback loop is used to eliminate the DC-offset at the output of the. double-balanced mixer. The test results show that the mixer with the DC-offset cancellation circuit has a voltage conversion gain of 9.5dB at 5.15GHz, a noise figure of 13.5dB, an IIP3 of 7.6dBm, a DC-offset voltage of 1.73mV eliminating 76% of DC-offset,and a power consumption of 67mW with a 3.3V supply. The direct conversion WLAN receiver has been implemented in 0.35μm SiGe BiCMOS technology.提出了一种符合IEEE802.11a无线局域网的5GHz直下变频接收机解决直流漂移的方法.该方法利用双平衡混频器输出端的模拟反馈环路消除直流漂移.该混频器经过测试,在5.15GHz频率下具有9.5dB的转换增益,13.5dB的噪声系数和7.6dBm的三阶交调,在3.3V电源电压条件下67mW的功耗,以及1.73mV的直流漂移,并能使直流漂移减少76%.该方案及整个直下变频的WLAN接收机已经采用0.35μmSiGeBiCMOS工艺流片并测试.

关 键 词：DC-offset WLAN BICMOS 

分 类 号：TN925.93[电子电信—通信与信息系统]