RAMP_FROM

Published:2009/7/14 0:40:00 Author:May | From:SeekIC

10 V-Based on use of integrating opamp to generate triangle wave from square wave. Circuit goes one step further by convening triangle to ramp function having predetermined negative starting level of -10V. When square-wave input signal changes in polarity from positive to negative, output of circuit begins to go positive as ramp function and C4 charges with output voltage. When input changes from negative to positive and output begins to go negative, Q1 conducts and drives noninverting input of opamp negative. Since square-wave input is positive at this time, opamp output is forced to go negative at its slew rate. Output then remains negative until square-wave input switches in negative direction for repeating cycle.-L. Wing, Op Amp and One Transistor Produce Ramp Function, EDN Magazine, Nov. 15, 1972, p 49.



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