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首页> 外文期刊>IEEE Journal of Solid-State Circuits >An automatic offset compensation scheme with ping-pong control for CMOS operational amplifiers
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An automatic offset compensation scheme with ping-pong control for CMOS operational amplifiers

机译:具有乒乓控制的CMOS运算放大器自动偏移补偿方案

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摘要

An automatic offset compensation scheme for CMOS operational amplifiers is presented. Offset is reduced by digitally adjusting the bias voltage of a programmable current mirror which is used as the load of the differential input stage. A 100% operating duty cycle is obtained by using a ping-pong structure. The offset compensation scheme is inherently time and temperature stable since the offset compensation is periodically performed with the ping-pong control. The proposed circuit has been fabricated using a 1.0 /spl mu/m n-well CMOS process. The measured offset voltages of the test circuits are less than 400 /spl mu/V in magnitude.
机译:提出了一种用于CMOS运算放大器的自动失调补偿方案。通过数字调整可编程电流镜的偏置电压来减少偏移,该电流镜用作差分输入级的负载。使用乒乓结构可获得100%的工作占空比。偏移补偿方案本质上是时间和温度稳定的,因为通过乒乓控制定期执行偏移补偿。所提出的电路是使用1.0 / splμm/ m的n阱CMOS工艺制造的。测试电路的测量失调电压幅度小于400 / spl mu / V。

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