0.18μm CMOS工艺下全摆幅恒跨导放大器设计  

Design of rail-to-rail constant g_m amplifier using 0.18μm CMOS process

作　　者：李晓潮[1,2] 周志新[1] 叶隽[1] 郭东辉[1,2] 

机构地区：[1]厦门大学信息科学与技术学院,福建厦门361005 [2]厦门大学福建省集成电路设计工程技术研究中心,福建厦门361005

出　　处：《华中科技大学学报（自然科学版）》2014年第4期55-59,共5页Journal of Huazhong University of Science and Technology(Natural Science Edition)

基　　金：国家自然科学基金资助项目(61274133)

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．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.

关 键 词：运算放大器 CMOS集成电路 跨导 全摆幅放大器 甲乙类 米勒补偿 

分 类 号：TN432[电子电信—微电子学与固体电子学]