Continuous-time analog filter having controllable gain characteristics

摘要

A Gm-C filter includes a filter passing an intended signal SI# in an input signal SI, and a control signal producing portion detecting a peak voltage value of an output signal of a filter to be controlled and a peak voltage value of the intended signal SI#, and making a comparison between them to produce a gain control signal CS for controlling a gain, and corrects a gain loss in the filter by applying the gain control signal CS to the filter.