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:
Oct. 09, 2007
Filed:
Jun. 27, 2005
Noriyuki Sugihara, Campbell, CA (US);
Noriyuki Sugihara, Campbell, CA (US);
Verigy (Singapore) Pte. Ltd., Singapore, SG;
Abstract
In one embodiment, an automated circuit test system is calibrated by electrically coupling a first calibration unit between a plurality of drivers and comparators of the test system, and then executing an AC timing calibration procedure to determine a timing delay for each of a first set of relationships. A second calibration unit is then electrically coupled between the plurality of drivers and comparators, and an AC timing calibration procedure is executed to determine a timing delay for each of a second set of relationships. The first and second calibration units comprise fixed wiring paths that respectively couple pairs of the drivers and comparators in accord with the first and second sets of relationships. A set of equations is solved based on the timing delays and driver/comparator relationships to determine relative timing errors introduced by signal paths of the test system including the drivers and comparators.