中文摘要：

采用TSMC 0.18μm CMOS工艺,设计实现了一种低压、低失调、恒跨导的轨到轨运算放大器.运算放大器在保证输入级跨导在整个共模范围内恒定的前提下,采用轨到轨的折叠共源共栅输入级,输入管工作在亚阈值区,采用反馈式AB类输出级以实现轨到轨的输出摆幅,同时采用斩波稳定技术减小输入参考失调和噪声.电路工作在1V单电源电压下,仿真得到119dB的直流增益和5.6MHz的增益带宽积.蒙特卡罗仿真结果显示失调电压分布的标准差为14μV,输入噪声普密度为18.19nV/√Hz.

英文摘要：

A rail-to-rail operational amplifier with low-voltage low-offset and constant transconductance is designed in TSMC 0. 18 gm CMOS process. The operational amplifier has a rail-to-rail folded cascode input stages, which ensures a constant transconductance over the available common-mode input range and all input transistors operate in subthreshold region. A class-AB output stage with folded mesh feedback is used to achieve the rail-to-rail output range. The chopper stabilization technique is exploited to reduce the input referred offset and noise. The circuit is simulated in Cadence Spectre with a single 1 V supply. The simulation results show that the dc gain is 119dB and the GBW is 5.6 MHz. Montecarlo simulations demonstrate an offset distribution with 14μV standard deviation. The input noise spectral density is 18. 19 nV/√ Hz Key words：