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:
Jun. 03, 2003
Filed:
Feb. 17, 1999
Philip S. Crosby, Portland, OR (US);
Tektronix, Inc., Beaverton, OR (US);
Abstract
An apparatus and method for measuring delay variation of a regenerated data clock and of the associated data packet has a first-in/first-out (FIFO) buffer to which an input clock associated with the data packet and data from the data packet are input. A sample clock derived from a regenerated data clock is used to clock the data out of the FIFO buffer, the regenerated data clock being a function of a reference frequency signal and a period control parameter. The regenerated data clock and input clock are compared to determine a buffer occupancy for the FIFO buffer, from which the period control parameter is derived. From the period control parameter and the buffer occupancy delay variation of the regenerated data clock and of the associated data packet is calculated.