Reference flat pulse generator

A reference step-like pulse generator is described which has been developed at NBS.This generator can be used for accurately characterizing the step response of various kinds of transient recording equipment (oscilloscopes, waveform recorders, transient digitizers, etc.)-Basic design principles are given as well as complete circuit diagrams and de- scriptions.An analysis of the output stage of the generator is presented together with the circuit models for developing a time-domain computer simulation program using extended-SCEPTRE.Preliminary specifications indicate that the NBS Reference Flat Pulse Generator provides a negative-going reference transition duration (90 to 10 percent) of 600 ps, ±20 percent with baseline perturbations of less than ±2 percent for less than 5 ns.