Method and apparatus for the capturing and characterization of h

Details Method and apparatus for the capturing and characterization of h Method and apparatus for the capturing and characterization of h

1994-03-15

1996-08-06

Voeltz, Emanuel T.

Excavating

371 221, 371 212, 371 214, G01R 313143

Patent

active

055441750

ABSTRACT:
A digital signal detector for sampling the state of a high speed digital signal occurring at a test node in a digital circuit which exhibits the same behavior with repeated applications of the same inputs. The digital signal detector samples the state of a test circuit node at discrete intervals in time and stores the digital levels with timing reference information. The stored information is then compared to the expected behavior of the tested node for analysis of delay-type and other parametric faults, such as performance faults. The digital signal detector includes a state discriminator which determines the state of the input digital signal by comparing its voltage level to one or more threshold voltages. The digital signal detector also includes a memory unit which stores the signal state information upon receipt of a memory strobe signal generated by a memory delay control circuit which delays the application of the memory strobe signal by a predetermined amount of time after the receipt of a clock pulse. The stored digital signal states can be later retrieved from the memory unit for evaluation of the input digital signal.

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