Low power circuit with proper slew rate by automatic adjustment of bias current

摘要

An evaluation circuit 16 repeats processing in which an output VD thereof is reset, there is obtained repeatedly given times a difference between sampled output voltages Vo of a replica circuit 11R when respective times t1 and t2 have elapsed after a voltage Vi is step-inputted to the replica circuit 11R, and the differences are successively summed. A comparator circuit 20 compares a difference cumulation voltage VD with a reference voltage VS. A bias adjustment circuit 15 steps up the bias currents of the replica circuit 11R and an adjusted circuit 11 at every this given times if VD>VS, and ceases the adjustment if VD<VS.