宽工作电压范围单电源CMOS误差放大器

A Single-Power-Supply CMOS Error Amplifier with Wide Power Supply Range

采用0.8μm标准数字CMOS工艺(VTN0=0.836V,VTP0=0.930V),设计并流片验证了具有宽工作电压范围(3～6V),可作SOC系统动态电源管理芯片内部误差放大器应用的单电源CMOS运算放大器。该误差放大器芯核同时具有适合低电压工作,并对工艺参数变化不敏感的优点。对于相同的负载情况,在3V的工作电压下,开环电压增益AD=83.1dB,单位增益带宽GB=2.4MHz,相位裕量Φ=85.2°,电源抑制比PSRR=154.0dB,转换速率Sr=2.2V/μs;在6V工作电压下,AD=85.1dB,GB=2.4MHz,Φ=85.4°,PSRR=145.3dB,Sr=3.4V/μs。

An error amplifier with single power supply for a system dynamic voltage scaling chip is designed and fabricated using 0.8 μm standard CMOS technology(V_(TN0)=0.836 V,V_(TP0)=0.930 V). The error amplifier IP is suitable for low voltage operations and insensitive to process variations. The amplifier can operate under a wide range of power supply from 3 V to 6 V. With the same work loads,an open-loop voltage gain(A_D)of 83.1 dB,a unity gain bandwidth(GB)of 2.4 MHz,a phase margin(Φ)of 85.2 °, a power supply rejection ratio(PSRR)of 154.0 dB,and a slew rate(S_r)of 2.2 V/μs have been achieved for a V_(DD) of 3 V,and the A_D=85.1 dB,GB=2.4 MHz,Φ= 85.4°,PSRR=160.0 dB,S_r=3.4 V/μs ,when V_(DD)=6 V.