摘要
为提高运放性能和增大输入输出信号动态范围,往往采用轨对轨输入输出结构的运放。介绍了一款基于0.35um CMOS工艺设计的恒定跨导轨对轨输入/输出运算放大器,不同于传统的输入结构,该电路采用了一种改进的输入结构和CLASS AB输出结构,两级的折叠共源共栅运放,其输入和输出均能工作在轨对轨的范围内。仿真结果表明该电路在整个共模电平范围内直流增益大于90dB,输出摆幅可达到100mV^vdd-100mV,功耗仅为300uW。电路结构简单紧凑,实现了在整个共模电平范围内的高增益,可广泛应用于精密放大领域。
In order to improve the performance of the operational amplifier and augment the dynamic range of input and output signal, rail -to-rail input and output structure is used commonly. The operational amplifier with constant transconductance, rail-to-rail input and output was designed based on 0.35um CMOS process. The amplifier is different from traditional input structure,it takes an improved in- put and CLASS AB output structure, and the two stage folded cascade structure is also considered. The input and output of amplifier can be worked in the range of rail-to-rail station. The simulation results demonstrate DC gain is larger than 90dB in the range of the whole common mode,and its slew rate can be reach to 100mV - vdd-100mV,but the power is only 300uW. For its simple and compact struc- ture, this op-amp can reach to high gain in the range of whole common mode and it is suitable for precision amplify field.
出处
《计算机技术与发展》
2013年第8期152-156,共5页
Computer Technology and Development
基金
"十二五"微电子预研(51308010601)
某国防预研基金(9140A08010712HK6101)
中国航空工业集团公司创新基金(2010BD63111)
