ADJUSTABLE_NONLINEAR_RAMP

Published:2009/7/13 6:12:00 Author:May | From:SeekIC

Circuit provides predistortion of sweep with concavity or convexity as required to compensate for nonlinearity of circuit being driven, Q1 operates as constant-current source that provides current proportional to voltage difference between ±15 V supply and base voltage of Q1. Ramp output is linear when wiper of curvature pot is set to minimum position (ground). Period of ramp is same as that of trigger impulses that gate SCR on. Circuit uses DC coupling, avoiding need for large coupling capacitors. With 0.22μF for C, period is 6 ms.-H, Olson, Ramp Generator Has Adjustable Nonlinearity, EDN Magazine, May 20, 1973, p 85 and 87.



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