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Title: High resolution time interval counter

A high resolution counter circuit measures the time interval between the occurrence of an initial and a subsequent electrical pulse to two nanoseconds resolution using an eight megahertz clock. The circuit includes a main counter for receiving electrical pulses and generating a binary word--a measure of the number of eight megahertz clock pulses occurring between the signals. A pair of first and second pulse stretchers receive the signal and generate a pair of output signals whose widths are approximately sixty-four times the time between the receipt of the signals by the respective pulse stretchers and the receipt by the respective pulse stretchers of a second subsequent clock pulse. Output signals are thereafter supplied to a pair of start and stop counters operable to generate a pair of binary output words representative of the measure of the width of the pulses to a resolution of two nanoseconds. Errors associated with the pulse stretchers are corrected by providing calibration data to both stretcher circuits, and recording start and stop counter values. Stretched initial and subsequent signals are combined with autocalibration data and supplied to an arithmetic logic unit to determine the time interval in nanoseconds between the pair of electrical pulses beingmore » measured.« less
Inventors:
 [1]
  1. (Livermore, CA)
Issue Date:
OSTI Identifier:
869415
Assignee:
United States of America as represented by United States (Washington, DC) SNL
Patent Number(s):
US 5333162
Contract Number:
AC04-76DP00789
Research Org:
AT & T CORP
Country of Publication:
United States
Language:
English
Subject:
resolution; time; interval; counter; circuit; measures; occurrence; initial; subsequent; electrical; pulse; nanoseconds; eight; megahertz; clock; main; receiving; pulses; generating; binary; word-a; measure; occurring; signals; pair; stretchers; receive; signal; generate; output; widths; approximately; sixty-four; times; receipt; respective; thereafter; supplied; start; stop; counters; operable; words; representative; width; errors; associated; corrected; providing; calibration; data; stretcher; circuits; recording; values; stretched; combined; autocalibration; arithmetic; logic; unit; determine; measured; clock pulse; pulse stretcher; output signals; output signal; time interval; electrical pulses; clock pulses; resolution time; electrical pulse; receiving electrical; circuit measures; interval counter; counter circuit; /377/