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:
Feb. 14, 1995
Filed:
Mar. 15, 1993
Philip N King, Fort Collins, CO (US);
Carroll E Morris, Jr, Fort Collins, CO (US);
Hewlett-Packard Company, Palo Alto, CA (US);
Abstract
An algorithm selects probe locations for both test signal probes and ground probes in a short-wire board test fixture. The board test fixture connects a test system to a circuit board under test. The algorithm minimizes ground bounce. The algorithm envisions first superimposing an imaginary grid of squares over the circuit board. Then, ground probe locations are derived so that no more than five test signal probes for each ground probe reside within each of the imaginary squares and so that each critical test signal probe is associated within a preselected distance of a ground probe. In the preferred embodiment, the imaginary square measure 1.4 inches on a side, and the preselected distance is approximately one inch.