A reconfigurable OTA-C baseband filter with wide digital tuning for GNSS receivers  

作　　者：潘文光 马成炎 甘业兵 叶甜春 

机构地区：[1]Institute of Microelectronics,Chinese Academy of Sciences [2]Hangzhou Zhongke Microelectronics Co.Ltd

出　　处：《Journal of Semiconductors》2010年第9期94-98,共5页半导体学报（英文版）

基　　金：supported by the National High Technology Research and Development Program of China(No.2007AA12Z344)

摘　　要：The design of a digitally-tunable sixth-order reconfigurable OTA-C filter in a 0.18-μm RFCMOS process is proposed.The filter can be configured as a complex band pass filter or two real low pass filters.An improved digital automatic frequency tuning scheme based on the voltage controlled oscillator technique is adopted to compensate for process variations.An extended tuning range（above 8：1） is obtained by using widely continuously tunable transconductors based on digital techniques.In the complex band pass mode,the bandwidth can be tuned from 3 to 24 MHz and the center frequency from 3 to 16 MHz.The design of a digitally-tunable sixth-order reconfigurable OTA-C filter in a 0.18-μm RFCMOS process is proposed.The filter can be configured as a complex band pass filter or two real low pass filters.An improved digital automatic frequency tuning scheme based on the voltage controlled oscillator technique is adopted to compensate for process variations.An extended tuning range（above 8：1） is obtained by using widely continuously tunable transconductors based on digital techniques.In the complex band pass mode,the bandwidth can be tuned from 3 to 24 MHz and the center frequency from 3 to 16 MHz.

关 键 词：reconfigurable filter wide tuning digital frequency tuning 

分 类 号：TN713[电子电信—电路与系统]