改进型折叠式共源共栅运算放大器电路的设计

摘要

In the telescopic cascodeand folded cascode operational amplifier, the folded cascode operational amplifier with high output swing and low bias voltage is widely used. However, these advantages are at the expense of a larger power consumption and lower current utilization rate. In order to improve the current utilization rate, an improved folded cascode operational amplifier was designed. The improved folded cascode operational amplifier can significantly improve transconductance, slew rate and noise performance at the same voltage and load. The simulation results show that under the same power consumption and area condition, the gain bandwidth and slew rate of the improved folded cascode operational amplifier is 3 times as that of the original folded cascode operational amplifier.%在套筒式共源共栅、折叠式共源共栅运放中,折叠式共源共栅运算放大器凭借较大的输出摆幅和偏置电压的较低等优点而得到广泛运用.但是,折叠式的这些优势是以牺牲较大的功耗、较低的电流利用率而换取的.本文以提高电流利用率为着手点设计了一种改进的折叠式共源共栅运算放大器,在相同的电压和负载下改进的折叠式共源共栅运算放大器能显著提升跨导、压摆率和噪声性能.仿真结果表明在相同功耗和面积的条件下,改进的折叠式共源共栅运算放大器的单位增益带宽和压摆率是折叠式共源共栅运放的3倍.