Pulse width measurement technique

Details Pulse width measurement technique Pulse width measurement technique

1989-11-13

1992-06-16

Lall, Parshotam S.

Boots, shoes, and leggings

371 1, G01R 3128

Patent

active

051229781

ABSTRACT:
Method and apparatus are disclosed for measuring the clock pulse width as it is received at a subject latch point in a system. In the system, test data distribution means is provided for distributing a test data signal from a test data source point to the data input of the subject latch point. The subject latch point is constructed to hold on its output the signal which was on the data input at selectably either the leading or trailing edge of the clock pulse. By adjusting the presettable delay in a test data signal generator, and observing the steady state output of the subject latch point conveniently after the last clock pulse in a burst reaches the subject latch point, it is possible to determine a delay setting at which the test data signal transition and the selected edge of the last clock pulse in the burst reach the subject latch point at substantially the same time. Using this method, two measurements are taken. The first measurement is obtained with the leading edge of each clock pulse selected as the effective edge for the subject latch point, and the second measurement is obtained with the trailing edge of each clock pulse selected as the effective edge for the subject latch point. The difference between the two values obtained is equal to the clock pulse width as received at the subject latch point. A clock skew measurement technique is also disclosed.

REFERENCES:
patent: 3976940 (1976-08-01), Chau et al.
patent: 4414637 (1983-11-01), Stanley
patent: 4833397 (1989-05-01), McMurray, Jr.
patent: 4839907 (1989-06-01), Saneski
patent: 4849973 (1989-07-01), Kubota
patent: 5003256 (1991-03-01), Merrill

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