Louis E Sanchez

40152111, Mar 29, 1977

Apr 9, 1976

5/675391

Louis A. Sanchez - San Jose CA

Itek Corporation - Lexington MA

H03K 908

329106

A first and second channel coupled to a leading edge comparator and a trailing edge comparator is provided wherein pulses having widths to be determined are transmitted to the comparators, the pulses in one channel emanating therefrom being delayed with respect to pulses emanating from the other channel. Biasing circuitry produces an offset bias voltage to change the relative D. C. levels of the pulses, thereby to establish two leading edge crossover points which effect operation of the leading edge comparator and two trailing edge crossover points which effect operation of the trailing edge comparator so that the time differences between pulses produced by the comparators is a measure of the widths of the pulses, regardless of changes in pulse amplitude, D. C. input drift, and changes in duty cycle.

57987300, Aug 25, 1998

Jul 9, 1997

8/891859

Louis Armando Sanchez - Morgan Hill CA

Litton Systems, Inc. - San Jose CA

G01S 728

342195

A pulse detector achieves high accuracy over a wide dynamic range in providing accurately spaced pulse edge markers that allow measurement of pulse to pulse time intervals. Received input pulses are transformed to a Gaussian like waveform and a single cycle AC signal having a first polarity initial half cycle is derived therefrom, accomplished by subtracting the Gaussian like waveform from a delayed, but substantially time overlapping, copy of that waveform. Upon completion of that initial half cycle, a pulse edge marker is generated. By measuring the time between the pulse edge marker obtained from one inputted pulse and that of the next, a measurement of the pulse to pulse interval is achieved that is of one nanosecond in accuracy.