The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Aug. 06, 1996
Filed:
Mar. 15, 1994
Kenneth E Posse, Fort Collins, CO (US);
Hewlett-Packard Company, Palo Alto, CA (US);
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.