Switched-capacitor multiply-by-two amplifier with reduced capacitor mismatches sensitivity and full swing sample signal common-mode voltage  

作　　者：徐新楠 姚素英 徐江涛 聂凯明 

机构地区：[1]School of Electronic Information Engineering,Tianjin University

出　　处：《Journal of Semiconductors》2012年第11期72-78,共7页半导体学报（英文版）

基　　金：supported by the National Natural Science Foundation of China(Nos.61036004,61076024)

摘　　要：A switched-capacitor amplifier with an accurate gain of two that is insensitive to component mismatch is proposed.This structure is based on associating two sets of two capacitors in cross series during the amplification phase.This circuit permits the common-mode voltage of the sample signal to reach full swing.Using the charge-complement technique,the proposed amplifier can reduce the impact of parasitic capacitors on the gain accuracy effectively.Simulation results show that as sample signal common-mode voltage changes,the difference between the minimum and maximum gain error is less than 0.03%.When the capacitor mismatch is increased from 0 to 0.2%,the gain error is deteriorated by 0.00015%）.In all simulations,the gain of amplifier is 69 dB.A switched-capacitor amplifier with an accurate gain of two that is insensitive to component mismatch is proposed.This structure is based on associating two sets of two capacitors in cross series during the amplification phase.This circuit permits the common-mode voltage of the sample signal to reach full swing.Using the charge-complement technique,the proposed amplifier can reduce the impact of parasitic capacitors on the gain accuracy effectively.Simulation results show that as sample signal common-mode voltage changes,the difference between the minimum and maximum gain error is less than 0.03%.When the capacitor mismatch is increased from 0 to 0.2%,the gain error is deteriorated by 0.00015%）.In all simulations,the gain of amplifier is 69 dB.

关 键 词：multiply-by-two amplifier mismatch-insensitive amplifier full swing switched-capacitor circuits 

分 类 号：TN722[电子电信—电路与系统] TM464[电气工程—电器]