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基于标准0.18μm CMOS工艺,设计一款输入恒跨导、输出全摆幅的运算放大器.利用最小电流选择电路实现输入的恒定跨导,并采用前置Class AB的结构提高输出驱动能力,实现最大的输出摆幅;同时引入内嵌式的米勒补偿电路来保证放大器工作的稳定性.设计结果表明:在典型工艺角下,0.0~1.8V的共模输入范围内,跨导的变化仅为1.6%,输出摆幅范围为0.005~1.800V,开环增益107.9dB,相位裕度为61.2°,功耗为658.8μW.
Based on the standard 0.18μm CMOS technology, an input constant-span transconductance and full-swing operational amplifier is designed.Using the minimum current selection circuit to achieve constant input transconductance and the front class AB structure to improve the output drive capability to achieve the maximum While the introduction of embedded Miller compensation circuit to ensure the stability of the amplifier work.The design results show that: in the typical process angle, 0.0 ~ 1.8V common-mode input range, the transconductance changes only 1.6%, output swing range of 0.005 ~ 1.800V, open loop gain of 107.9dB, phase margin of 61.2 °, power consumption of 658.8μW.