具有轨对轨输入的高增益低失调放大器

Zhiying Zhang, Xiaobo Wu, Xiaolang Yan
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引用次数: 2

摘要

为了适应电源管理集成电路等应用,本文提出了一种高增益、低失调的BiCMOS运放。采用互补输入级来满足轨对轨ICMR(输入共模范围)。并在轨对轨放大器中引入了特殊的电路结构,以保持其增益恒定。仿真结果表明,在整个输入范围内,gmv的变化保持在2%以内。同时,通过双极输入级和电流补偿电路,将运放的偏置电压降低到0.5mV以下。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
A high gain low offset amplifier with rail-to-rail inputs
To fit some applications like in Power Management IC (Integrated Circuit), ahigh gain low offset BiCMOS op amp was proposed in this paper. A complementary input stage was adopted to meet a rail-to-rail ICMR (Input Common-Mode Range). And a special circuit configuration was introduced into the rail-to-rail amplifier to keep its gain constant. Simulation showed that the variation of gmwas maintained within 2% over the whole input range. Meanwhile, by using bipolar input stage and current compensating circuit, the offset voltage of the op amp was reduced to less than 0.5mV.
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