David J Hoppe

US Patent:

44390467, Mar 27, 1984

Filed:

Sep 7, 1982

Appl. No.:

6/414769

Inventors:

David R. Hoppe - McHenry IL

Assignee:

Motorola Inc. - Schaumburg IL

International Classification:

G04F 800

US Classification:

368120

Abstract:

A vernier system for digitally measuring elapsed time between a start and stop pulse against a system clock reference where the start pulse is synchronized with the clock. Fractional parts of the clock pulse at stop time are interpolated by means of a tapped delay line connected to a plurality of latch circuits which provide the least significant bits by way of a read-only-memory look-up table.

US Patent:

44339194, Feb 28, 1984

Filed:

Sep 7, 1982

Appl. No.:

6/414768

Inventors:

David R. Hoppe - McHenry IL

Assignee:

Motorola Inc. - Schaumburg IL

International Classification:

G04F 800

US Classification:

368120

Abstract:

A system for measuring the difference in time between two unknown signals utilizing a pair of matched delay lines with taps which are differentially separated in time. Each pair of output taps from the two delay lines is fed to a dc flip flop or other sensor which determines which of the two inputs occurs first in time. When there is a transition in the sequence of input signal timing a ROM determines the particular pair of taps which provided that change in sequence and delivers a series of least significant bits representative thereof.