ANALOG_SAMPLE_AND_HOLD

Published:2009/7/20 21:25:00 Author:Jessie | From:SeekIC

Uses AM685 comparator for continuous sampling of analog voltage at summing node formed by R1, and R2.Complementary logic outputs of comparator drive differential indicator formed by AM112 opamp. When error voltage at summing node is positive, comparator latches in high state and causes output opamp to integrate toward more negative voltage. When error voltage at latch time (determined by pulse input) is negative, integrator voltage ramps to more positive value. Circuit soon reaches equilibrium, at which out-put voltage is equal to -10 times value of sampled waveform. Article gives performance waveforms for sampling video pulses.-S. Den-'clinger, High-Speed Analog Sampler Uses Only Two IC's, EDN Magazine, May 20, 1977, p 128 and 130.



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