一种低压低功耗衬底驱动轨至轨运算放大器设计  

Design of a low-voltage low-power bulk-driven rail-to-rail operational amplifier

作　　者：郭宝增[1] 张玉波[1] 

机构地区：[1]河北大学电子信息工程学院,河北保定071002

出　　处：《微型机与应用》2011年第3期26-29,共4页Microcomputer & Its Applications

基　　金：河北省教育厅科研基金资助项目(2009310)

摘　　要：介绍了一种基于衬底驱动技术的低电压低功耗运算放大器。输入级采用衬底驱动MOSFET,有效避开阈值电压限制;输出采用改进前馈式AB类输出级,确保了输出级晶体管的电流能够得到精确控制,使输出摆幅达到轨至轨。整个电路采用PTM标准0.18μm CMOS工艺参数进行设计,用Hspice进行仿真。模拟结果显示,测得直流开环增益为62.1dB,单位增益带宽为2.13MHz,相位裕度52°,电路在0.8V低电压下正常运行,电路平均功耗只有65.9μW。This paper introduced a low-voltage low-power amplifier based on the bulk-driven technique.Bulk-driven MOSFETs at the inputs avoid the limitation of threshold voltage efficiently.A feed-forward class AB output stage is used to ensure that the current of the output transistors is controlled precisely and the output swing reaches rail-to-rail.The circuit is designed by using predictive technology model 0.18 μm CMOS and simulated by Hspice software.The simulation results show that the DC gain is 62.1 dB,the unity gain bandwidth is 2.13 MHz,and the phase margin is 52°,the circuit operates normally in a low voltage of 0.8 V and the power consumption is only 65.9 μW.

关 键 词：轨至轨 低电压 低功耗 衬底驱动 

分 类 号：TN402[电子电信—微电子学与固体电子学]