基于0.5μm CMOS工艺的低压低功耗电流放大器

Low-Voltage and Low Power Current-Feedback Op-Amps Based on 0.5μm CMOS Technology

采用BSM30.5μm CMOS工艺,通过引入电流模式的缓冲级输入输出结构而设计了一种性能较高的CMOS电流反馈运算放大器.在1.5V的电源电压下,当偏置电流为1μA,负载电容为20pF时,对整个电路进行HSPICE仿真.结果表明,该电路结构达到了87dB的开环增益,23.8MHz的单位增益带宽,48°的相位裕度,139dB的共模抑制比,功耗仅为2.09mW.

Based on BSM3 0.5μm CMOS process, the paper presents an improved CMOS current-feedback operational amplifier malting use of Current mode configuration with input buffer stage and output buffer stage. When driving a capacitive load of 20pF, simulation results of the proposed CFOA with HSPICE show a： 87dB open loop gain, 23.8MHz unity gain bandwidth, 48 degree phase margin, 139dB CMRR and power consumption around 2.09mW from 1.5V supply voltage and 1μA biasing current.