一种极低功耗运算放大器的设计与仿真  

Design and simulation of an ultra-low power operation amplifier

作　　者：骆丽[1] 蔡晓伟[1] 宫琦[1] 

机构地区：[1]北京交通大学电子信息工程学院,北京100044

出　　处：《北京交通大学学报》2011年第2期72-75,共4页JOURNAL OF BEIJING JIAOTONG UNIVERSITY

基　　金：国家自然科学基金资助项目(60976024)

摘　　要：为了满足低电压低功耗的应用需求,本文利用MOSFET在亚阈区的超低功耗特性,实现了一种带共模反馈的亚阈运算放大器.该亚阈运算放大器结构简单,采用TSMC 0.18μm工艺实现,且工作于1.2 V电源电压下.通过Synopsys Hspice仿真,结果表明,该电路在输出负载为0.5pF时直流增益为70.97 dB、单位增益带宽6.346 MHz、相位裕度85.76°、正负压摆率分别为3.58V/μs和-3.58 V/μs,功耗仅为4.80μW.To meet the requirements of low-voltage and low-power,a sub-threshold operation amplifier（op-amp） with common-mode feedback is designed,using the ultra-low power feature of MOSFET which works in sub-threshold region.The subthreshold op-amp is implemented under TSMC 0.18 μm process with a single 1.2 V supply and simulated by Synopsys Hspice.The simulation results show that the subthreshold op-amp whth a 0.5 pF output load has a DC gain of 70.97 dB,a unity gain bandwidth of 6.346 MHz,a phase margin of 85.76°,positive and negative slew rate of 3.58 V/μs and-3.58 V/μs respectively,and its power consumption is only 4.80 μW.

关 键 词：极低功耗 亚阈 运算放大器 直流增益 单位增益带宽 相位裕度 压摆率 

分 类 号：TN495[电子电信—微电子学与固体电子学]