关键词: 低功耗, 运算放大器, 高增益, 宽带宽, 折叠共源共栅

Abstract: A Low-voltage 1.8 V with High Gain and High unity bandwidth and low-power integrated operational amplifier was designed based on SMIC 0.18 μm CMOS process.Adopted gain-boosting technique in folded-cascode architecture greatly raised the gain.Used assisted-amplifier current scaling-down technique effectively reduced the power consumption，also had SC-CMFB circuit.Simulation results on Cadence spectre show that the DC open-loop gain is 111.2 dB and 1.8 V output swing with a unity gain frequency of 576 MHz and phase Margin of 58.4°，0.792 mW power dissipation only. Besides 4.597 ns setting time of a 0.1%accuracy and 4.911 ns setting time of a 0.01%accuracy under the 1 pF load.

Key words: low-power, operational amplifier, high gain, high bandwidth, folded-cascode