一种新型低功耗两级运算放大器的实现

Completion Of A Novel Low-power Two-stage Operational Amplifier

针对目前低功耗设计的问题,讨论了一种有效的低成本的实现方式。介绍了准浮栅技术晶体管的工作原理,并运用此技术对传统的两级运算放大器进行改进。采用了Chartered 0.35umCMOS工艺来实现电路,在CADENCE Spectre的仿真结果表明,在一个工作电压为1.2V的情况下,最大开环增益可达到72.6db,相位裕度为54度,单位增益带宽为1.8MHZ,功耗仅为8.75uW,充分体现了这种技术的优越性。

According to the present problem of low power, an effective way of realizing in low cost is discussed. Introduced the fun-damental principle of quasi-floating gate transistors and improved the tradition two-stage CMOS fully differential operational amplifier use this skill. The improved circuit has been implemented in Chartered 0.35um COMS process. The system simulation results con-ducted under the CADENCE Spectre environment indicate that it achieves 72.6 dB dc open-loop gain, phase margin for a 10G load r...