DRIVEN_CONSTANT_AMPLITUDE_SAWTOOTH

Published:2009/7/6 22:44:00 Author:May | From:SeekIC

Gives constant-amplitude output over input frequency range of 2-100 kHz. Input signal from SN74121 IC is 300-ns pulse that drives basic sawtooth generator Tr1-Tr2. Resulting sawtooth waveform is amplified by opamp A1 of MC3401P four-opamp package and fed to A2 which acts as comparator for amplitude-sensing, 25K threshold-setting pot is adjusted for maximum linearity of amplitude versus frequency, Rectangular-wave output ofA2 is filtered to give control voltage that is shifted in level by A3 and D1 to meet input voltage requirements of Tr2. Desired sawtooth output appears at source of Tr3.-J. N. Paine, Constant AmplitudeSawtooth Generator, Wireless World, 0ct.1975, p 473.



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