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中文摘要：
基于标准0．18μmCMOS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．
英文摘要：
A rail-to-rail and constant grn operational amplifier was introduced with standard 0.18 μm CMOS technology. The constant gm was achieved by the minim μm current selecting circuit. The pro- posed class AB structure realized rail-to-rail output and increased the output drive capability. The nes- ted miller compensation was used to guarantee the stability of the amplifier. The simulation results show that the gm variation is only 1.6%, the output swing is 0. 005-1. 800 V, the gain is 107.9 dB, the phase margin is 61.2%, and the power dissipation is 658.8 μW, within a 0.0-1.8 V common- mode input range at typical corner.
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