一种输入输出轨到轨CMOS运算放大器的设计  

An Input Output Rail-to-rail CMOS Operational Amplifier Design

作　　者：李有慧 

机构地区：[1]无锡华润上华科技有限公司上海分公司,上海201103

出　　处：《电子科技》2015年第6期165-169,共5页Electronic Science and Technology

摘　　要：随着电源电压的日益降低,信号幅度不断减小,在噪声保持不变的情况下,信噪比也会相应地减小。为了在低电源电压下获得高的信噪比,需提高信号幅度,而输入输出轨到轨运算放大器可获得与电源电压轨相当的信号幅度。中文在理论分析了输入输出轨到轨CMOS运算放大器主要架构优缺点后,给出了一种新的输入输出轨到轨CMOS运算放大器的设计,该电路在华润上华0.18μm工艺平台上流片验证。测试结果表明,输入范围从0到电源电压,输出范围从50 m V到电源电压减去50 m V,实现了输入输出轨到轨的目标。With the power supply decreases gradually, the amplitude of the signals reduce at the same time. However the noise level retains which leads to the signal-to-noise ratio （SNR） being worse. To get higher SNR under lower power supply, the amplitude of signals should be enhanced. Input and output rail-to-rail operational am- plifiers can get amplitude near to power supply rails. Firstly theoretical analysis of advantage and shortcomings of input output rail-to-rail CMOS operational amplifier main structure is developed, then the paper presents a new design of an input and output rail-to-rail operational amplifier. The circuit was taped out and verified on CSMC＇s 0. 18μm process. Test results show that the input range could be from 0 to power supply and the output range could be from 50mV to power supply minus 50mV, which achieves the target of input＇s and output＇s rail-to-rail.

关 键 词：CMOS 轨到轨 运算放大器 米勒补偿 

分 类 号：TN432[电子电信—微电子学与固体电子学] TN722