公开(公告)号：US20130021098A1

公开(公告)日：2013-01-24

申请号：US13188426

申请日：2011-07-21

申请人： Moshe GERSTENHABER ,  Sandro HERRERA ,  Chau Cuong TRAN

发明人： Moshe GERSTENHABER ,  Sandro HERRERA ,  Chau Cuong TRAN

IPC分类号： H03F3/45

CPC分类号： H03F1/3247 ,  H03F3/195 ,  H03F3/245 ,  H03F3/45475 ,  H03F2200/171 ,  H03F2200/261 ,  H03F2200/411 ,  H03F2203/45512

摘要： A system and method for reducing gain error and distortion in an operational amplifier due to errors in the second or integrator stage. A correction circuit may replicate an error current and insert the current into the signal stream to preempt the induction of an error at the amplifier's input. A capacitor may sample the error voltage at the input of the integrator stage of the amplifier and generate a replica of the error current in the integration capacitor to feed it into the input of the integrator stage. This eliminates any nonlinearity errors created by error currents in the compensation or integration capacitor at the second or integrator stage of the two-stage amplifier. Feeding the error current to the integrator stage may be facilitated with a unity gain buffer and a current mirror.

摘要翻译： 一种用于在第二或积分器级中由于误差而减小运算放大器中的增益误差和失真的系统和方法。 校正电路可以复制误差电流并将电流插入到信号流中以抢占放大器输入端的误差感应。 电容器可以在放大器的积分器级的输入处对误差电压进行采样，并在积分电容器中产生误差电流的复制品，以将其馈送到积分器级的输入端。 这消除了在两级放大器的第二或积分级的补偿或积分电容器中由误差电流产生的任何非线性误差。 通过单位增益缓冲器和电流镜可以使误差电流馈送到积分器级。