期刊论文

Design of a rail-to-rail operational amplifier with constant transconductance under low-voltage and low-power

中文

电子元件与材料

1001-2028

2020

39

10

65-69

10.14106/j.cnki.1001-2028.2020.0309

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)。

本校为第一机构

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 0.18 μm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44 μW,输入级跨导变化率为5.5%,实现了低电源电...

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 four - layer 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-...