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:
Jan. 02, 2007
Filed:
Jul. 22, 2004
Lisa Ann Yunker, Fort Collins, CO (US);
Lisa Ann Yunker, Fort Collins, CO (US);
Hewlett-Packard Development Company, L.P., Houston, TX (US);
Abstract
A printed circuit board is built including metal traces for a differential clock. Within a break in each metal trace pads for a delay line socket are included along with pads for two 0-ohm resistors in series. In between the two 0-ohm resistors metal traces are build in a configuration to provide a specified delay in a signal passing through the trace. This group of pads and traces allows a designer to test (on the completed printed circuit board) differential clocks in modes including negative skew. In normal operation, the 0-ohm resistors are present on the printed circuit board and the clock signals pass through the metal traces build in a configuration to provide a specified delay in the signals passing through the traces. During testing, delay lines may be placed in the delay line sockets and the 0-ohm resistors may be removed. When 0 ns delay lines are placed in the sockets, the clock delays are negatively skewed from normal delay since the clock signals no longer pass through the long metal traces between the 0-ohm resistors.