DUTY_CYCLE_MODULATOR

Published:2009/7/6 22:56:00 Author:May | From:SeekIC

Uses half of LM339N or LM3302N quad comparator. With no modulation signal, output is symmetrical square wave generated by one of comparators. Constant-amplitude triangle wave is generated at inverting input of second comparator, and is relatively independent of supply voltage and frequency changes. Modulating signal varies switching points to produce duty-cycle modulated wave for such applications as class D amplification for servo and audio systems.-H. F. Stearns, Voltage Comparator Makes a Duty-Cycle Modulator, EDN Magazine, June 5, 1975, p76-77.



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