A low power and low distortion rail-to-rail input/output amplifier using constant current technique  

作　　者：刘彦 赵毅强 张世林 赵宏亮 

机构地区：[1]School of Electronic Information Engineermg,Tianjin University [2]School of Physics,Liaoning University

出　　处：《Journal of Semiconductors》2011年第4期107-110,共4页半导体学报（英文版）

基　　金：Project supported by the Science and Technology Program of Tianjin,China(No08ZCKFGX00200)

摘　　要：A rail-to-rail amplifier with constant transconductance,intended for audio processing,is presented.The constant transconductance is obtained by a constant current technique based on the input differential pairs operating in the weak inversion region.MOSFETs working in the weak inversion region have the advantages of low power and low distortion.The proposed rail-to-rail amplifier,fabricated in a standard 0.35μm CMOS process,occupies a core die area of 75×183μm2.Measured results show that the maximum power consumption is 85.37μW with a supply voltage of 3.3 V and the total harmonic distortion level is 1.2%at 2 kHz.A rail-to-rail amplifier with constant transconductance,intended for audio processing,is presented.The constant transconductance is obtained by a constant current technique based on the input differential pairs operating in the weak inversion region.MOSFETs working in the weak inversion region have the advantages of low power and low distortion.The proposed rail-to-rail amplifier,fabricated in a standard 0.35μm CMOS process,occupies a core die area of 75×183μm2.Measured results show that the maximum power consumption is 85.37μW with a supply voltage of 3.3 V and the total harmonic distortion level is 1.2%at 2 kHz.

关 键 词：AMPLIFIER constant transconductance low distortion low power RAIL-TO-RAIL 

分 类 号：TN722[电子电信—电路与系统]