PULSE_BASELINE_CLAMP

Published:2009/6/25 22:01:00 Author:May | From:SeekIC

Provides accurate clamping of baseline level of fast positive-going digital pulses with constantly changing duty cycle when capacitively coupled into level-sensitive circuits. Uses HA-2535 opamp. Diode D2 clamps negative output swing of opamp to about 0.3V, preserving amplifier recovery time in preparation for clamping next input transition, Pulse widths at input are less than 100 ns, with transition time under 15 ns and duty cycle ranging from 2 to 50%. Diodes are HP 2800 series. For clamping sine or triangle AF waves, opamp can be 741.-D. L. Quick, Clamp Speeds Restoration of AC-Coupled Base Lines, EDN Magazine, Sept. 5,1975, p 76.



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