摘要
提出了一种恒跨导轨到轨运算放大器,输入级电路采用三倍电流镜结构,补偿输入差分对管的静态电流,降低输入级跨导变化率;中间级电路采用两个三层MOS管共源共栅结构代替传统轨到轨运算放大器中的四层MOS管套筒式共源共栅结构,实现四端输入转为双端输出,并降低电源电压;输出级电路采用交差耦合输出结构,实现轨到轨输出,同时完成双端输入转单端输出,设计一种恒跨导轨到轨运算放大器。基于TSMC 0.18μm工艺完成电路与版图设计,使用Spectre完成仿真。结果表明,在电源电压为1 V,输入电压从0 V变化到1 V时,该放大器可实现0~1 V的轨到轨输出,静态功耗仅为44μW,输入级跨导变化率为5.5%,实现了低电源电压、低功耗和恒跨导的性能指标。
A rail-to-rail operational amplifier was designed with constant trans-conductance,which is operated at low-voltage and low-power.The input stage adopts a triple current mirror structure to compensate the static current of the input differential pair and reduce the trans-conductance variation.The intermediate stage adopts two three-layer cascade structures instead of traditional fourlayer structure.After that,the four input portals become two portals for the output,which reduced the power supply voltage.The output stage adopts a cross-coupled structure to realize rail-to-rail operation and differential-to-single ended conversion at the same time.The circuit and layout were designed with 0.18μm CMOS process and simulated by Spectre software.The result shows that the rail-to-rail input and output is realized at the power supply of 1 V.The static power consumption is 44μW.The input trans-conductance variation is smaller than 5.5%.This amplifier achieves low power supply voltage,low power consumption and constant transconductance.
作者
谢海情
陈玉辉
王振宇
XIE Haiqing;CHEN Yuhui;WANG Zhenyu(School of Physical and Electronic Sciences,Changsha University of Science and Technology,Changsha 410114,China)
出处
《电子元件与材料》
CAS
CSCD
北大核心
2020年第10期65-69,共5页
Electronic Components And Materials
基金
湖南省教育厅基金资助科研项目(17B007)
长沙市科技计划重点项目(kq1901102)。
关键词
运算放大器
恒跨导
轨到轨
低压低功耗
三倍电流镜
共源共栅
operational amplifier
constant transconductance
rail-to-rail
low voltage low power
three-times current mirror
cascode
