一种低功耗恒跨导CMOS运算放大器的设计  

Research and design of a low-power consumption and constant transconductance CMOS operational amplifier

作　　者：杨依忠[1] 

机构地区：[1]合肥工业大学电子科学与应用物理学院,安徽合肥230009

出　　处：《合肥工业大学学报（自然科学版）》2010年第10期1576-1578,共3页Journal of Hefei University of Technology：Natural Science

基　　金：安徽省高校青年教师资助项目(2008jq1004)

摘　　要：文章分析了传统的轨到轨运算放大器输入级电路,设计了一种低功耗、恒跨导CMOS运算放大器。整个电路基于0.5μm标准N阱CMOS工艺进行设计,采用HSPICE工具仿真,在3 V单电源工作电压情况下,功耗约为0.15 mW,当电路驱动3 pF电容的负载时,电路的直流增益达到78 dB,单位增益带宽达到3 MHz,相位裕度为81°,达到了设计的低功耗、恒跨导的要求。Based on the analysis of traditional input circuit of rail-to-rail operational amplifier（op amp）,this paper proposes a low-power consumption and constant transconductance CMOS op amp.The op amp is implemented with a standard 0.5 μm N-well CMOS technology and simulated with HSPICE.The power consumption of the whole circuit is about 0.15 mW with a single supply of 3 V.The open loop gain of the circuit achieves 78 dB.The gain-bandwidth reaches 3 MHz and the phase margin is 81° for a 3 pF load capacitance.The result shows that the design satisfies the requirement of low-power consumption and constant transconductance.

关 键 词：运算放大器 轨到轨 恒跨导 差分输入对 

分 类 号：TN432[电子电信—微电子学与固体电子学]