A Fast Analog Comparison for Hybrid Computation

This paper describes the design of a new exceptionally fast analog comparator with digital output for hybrid computation. A wide-band dc amplifier with regenerative feedback permits high-speed comparator operation within 100 ns of zero crossing for all input rates of change between zero and 5×10⁶ volts/second. Static hysteresis between ±10 mV and ±40 mV improves noise immunity. Drift is less than 25 microvolts per degree centigrade without chopper stabilization, which is optional. A simple two-transistor circuit provides both the regeneration and the digital output.