Richard A Sumner

US Patent:

6137749, Oct 24, 2000

Filed:

Dec 18, 1998

Appl. No.:

9/155670

Inventors:

Richard L. Sumner - Pomona NY

Assignee:

LeCroy Corporation - Chestnut Ridge NY

International Classification:

G04F 800
G04F 1000
H03K 518

US Classification:

368113

Abstract:

To measure relatively long time intervals with very high resolution, apparatus and method operate to receive a first pulse and a clock signal that has a known period, synchronize the first pulse with the clock signal, stretch the first synchronized pulse in accordance with a first stretch ratio, produce a first compared output pulse corresponding to the first stretched signal, synchronize the first compared output pulse with the clock signal, generate a first pulse sequence from the first synchronized pulse and the first synchronized compared output pulse, convert times of occurrences of the edges of the first pulse sequence to respective time values, receive a second pulse and generate a second pulse sequence in a manner similar to that of the first pulse sequence, convert times of occurrences of the edges of the second pulse sequence to respective time values, count the elapsed number of clock periods between the first and second synchronized pulses, derive the time interval between the received pulses from the time values, the first and second stretch ratios, the period of the clock and the elapsed number of clock periods, and calibrate the first and second stretch ratios from the time values.

US Patent:

57038384, Dec 30, 1997

Filed:

Feb 16, 1996

Appl. No.:

8/602904

Inventors:

Mark S. Gorbics - Franklin Lakes NJ
Keith M. Roberts - Nyack NY
Richard L. Sumner - Pomona NY

Assignee:

LeCroy Corporation - Chestnut Ridge NY

International Classification:

G04F 800
H03K 513

US Classification:

368120

Abstract:

A Vernier delay line interpolator provides a precision level smaller than a clock period by delaying a periodic pulse signal in a delay line which has equally time-spaced taps and a total delay that is a harmonic H greater than 1 of the pulse period. The taps of the delay line are latched and decoded to derive the fraction of the pulse period that has passed. When the interpolator is combined with a coarse counter, misalignment between their outputs is prevented by having the coarse counter count both edges of the periodic pulse signal so as to provide redundant bits between the counter and the interpolator. If the redundant bits are not equal, the counter output is corrected before it is combined with the output of the interpolator.

US Patent:

58387544, Nov 17, 1998

Filed:

Mar 11, 1997

Appl. No.:

8/814835

Inventors:

Mark S. Gorbics - Franklin Lakes NJ
Keith M. Roberts - Nyack NY
Richard L. Sumner - Pomona NY

Assignee:

Lecroy Corporation - Chestnut Ridge NY

International Classification:

G06M 300

US Classification:

377 20

Abstract:

A Vernier delay line interpolator provides a precision level smaller than a clock period by delaying a periodic pulse signal in a delay line which has equally time-spaced taps and a total delay that is a harmonic H greater than 1 of the pulse period. The taps of the delay line are latched and decoded to derive the fraction of the pulse period that has passed. When the interpolator is combined with a coarse counter, misalignment between their outputs is prevented by having the coarse counter count both edges of the periodic pulse signal so as to provide redundant bits between the counter and the interpolator. If the redundant bits are not equal, the counter output is corrected before it is combined with the output of the interpolator.