Published:2009/7/12 22:18:00 Author:May | From:SeekIC
Dual comparator, solid-state switch, and fast FET opamp provide flexibility, range, and accuracy required for using converter in computer-controlled test system. IC2 operates as integrator and sample-and-hold circuit. Reference voltages of IC1, VREF1, and VFEF2 allow time measurements of signal having ehher positive or negative voltage levels or both. Floating output stdges of comparators provide voltage translation for FET switch S1. With S1 closed, IC2 integrates for time period during which input signal is below reference voltages. With S1 open, IC2 holds final voltage value. Measurement range is from 1 μs to several hours.-C. Wojslaw, Wide Range Time Measurements Simplified, EDN Magazine,-Feb.5, 1974, p 95-96.
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