METHOD AND CIRCUIT FOR REDUCTION OF HARMONIC DISTORTION AND PRODUCING SINUSOIDAL WAVE FROM SQUARE WAVE

摘要

A method and circuit for converting a square wave to a sine wave wherein said sine wave signal maintains phase with the input square wave and very low harmonic distortion. Harmonic distortion of a square wave is efficiently minimized by generating a fundamental frequency signal of square wave using reference signal of square wave frequency and modifying it by signal processing operation. An adaptive filter utilizing this method uses multiplier, an amplifier, an integrator, subtracter circuit and produces a sine wave output of fundamental frequency of input square wave and has less than 2 percent harmonic distortion.