一种低电压低功耗Rail-to-Rail CMOS运算放大器的设计  

A low-voltage and low-power CMOS operational amplifier with Rail-to-Rail input and output range

作　　者：帅欣[1] 董会宁[1] 黄竹[1] 

机构地区：[1]重庆邮电大学光电工程学院,重庆400065

出　　处：《重庆邮电大学学报（自然科学版）》2007年第6期658-661,688,共5页Journal of Chongqing University of Posts and Telecommunications(Natural Science Edition)

基　　金：重庆市自然科学基金(CSTC2005BB4070)

摘　　要：基于2μm CMOS工艺,设计实现了一种2.4 V低功耗带有恒跨导输入级的Rail-to-Rail CMOS运算放大器。采用尾电流溢出控制的互补差分输入级和对称AB类推挽结构的输出级,实现了满电源幅度的输入输出和恒输入跨导;运用折叠共源共栅结构作为中间增益级,实现电流求和放大。整个电路在2.4 V的单电源供电下进行仿真,直流开环增益为76.5 dB,相位裕度为67.6,单位增益带宽为1.85 MHz。Based on 2 μm CMOS technology, a low voltage and low power CMOS operational amplifier with Rail-to-Rail input and output range is designed. It acquires Rail-to-RM1 common mode input range and constant transconductance by adopting a complementary input differential pairs which are controlled by current spill-over circuit. A symmetric push pull output stage which is based on class AB acquires Rail to Rail output range. In order to get enough gain, the folded cascode structure is used as intermediate amplifier stage and summing circuit. The whole circuit is simulated with a single 2.4 v power supply, The simulation results indicate that the DC gain is 76.5 dB while the phase margin is 67. 6, and the unit-gain bandwidth 1.85 MHz,

关 键 词：CMOS 低电压 低功耗 RAIL-TO-RAIL 恒跨导 运算放大器 

分 类 号：TN432[电子电信—微电子学与固体电子学]