Design of an Active-RC Low-Pass Filter with Accurate Tuning Architecture

作     者：陈方雄 林敏 陈备 贾海珑 石寅 代伐 Chen Fangxiong;Lin Min;Chen Bei;Jia Hailong;Shi Yin;Dai Forster

作者机构：中国科学院半导体研究所北京100083 苏州中科半导体集成技术研发中心苏州215021 美国Auburn大学电机与计算机工程系 

出 版 物：《Journal of Semiconductors》 (半导体学报（英文版）)

年 卷 期：2008年第29卷第11期

页      面：2238-2244页

核心收录：

学科分类：080902[工学-电路与系统] 0809[工学-电子科学与技术（可授工学、理学学位）] 08[工学] 

主　　题：CMOS circuit design auto tuning active RC filter wireless system 

摘      要：An active-RC low-pass filter of 5MHz cutoff frequency with a tuning architecture is proposed. It is implemented in 0. 18μm standard CMOS technology. The accuracy of the tuning system is improved to be within （ - 1.24%, ＋ 2.16%） in measurement. The chip area of the tuning system is only a quarter of that of the main-filter. After tuning is completed, the tuning system will be turned off automatically to save power and to avoid interference. The in-band 3rd order harmonic input intercept point （IIP3） is larger than 16. ldBm, with 50Ω as the source impedance. The input referred noise is about 36μVrms The measured group delay variation of the filter between 3 and 5MHz is only 24ns,and the filter power consump- tion is 3.6roW. This filter with the tuning system is realized easily and can be used in many wireless low-IF receiver applications, such as global position systems （GPS）, global system for mobile communications （GSM） and code division multiple access （CDMA） chips.