半导体学报2003，Vol.24Issue(9)：927-932,6.
全差分群时延可精确调节的四阶Bessel滤波器实现
Realization of Fully Differential Fourth-Order Bessel Filter with Accurate Group Delay
摘要
Abstract
A fully differential R-MOSFET-C fourth-order Bessel active lowpass filter employing fully differential operational amplifier,passive resistors,and current-steering MOS transistors as a variable resistor is proposed.This proposed implementation relies on the tunability of current-steering MOS transistors operating in the triode region counteracting the concert deviation of resistor in the integrated circuit manufacturing technology in order that the group delay of Bessel active filter could be designed accurately.The amplifier is not only with voltage common-mode negative feedback,but also with current common-mode negative feedback,which will benefit for the stability of its DC operating point.0.75μs group delay fourth-order Bessel lowpass filter,which is synthesized according to passive doubly terminated RLC prototype lowpass filter,demonstrates better than -65dB THD using 100kHz,2.5Vpp signal in Taiwan UMC 2P2M(2-poly,2-metal)5.0V,0.5μm CMOS technology.关键词
全差分式/电压、电流共模负反馈(CMFB)/频率可调性/R-MOSFET-C滤波器/Bessel滤波器Key words
fully differential/voltage and current common-mode negative feedback/frequency tunable/R-MOSFET-C filter/Bessel filter分类
信息技术与安全科学引用本文复制引用
江金光,何怡刚,吴杰..全差分群时延可精确调节的四阶Bessel滤波器实现[J].半导体学报,2003,24(9):927-932,6.基金项目
国家自然科学基金资助项目(批准号:50277010) （批准号:50277010）
