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:
Apr. 01, 2008
Filed:
Mar. 01, 2005
David Meltzer, Wappinger Falls, NY (US);
Gregory A. Blum, Lagrangeville, NY (US);
David Meltzer, Wappinger Falls, NY (US);
Gregory A. Blum, Lagrangeville, NY (US);
Seiko Epson Corporation, Tokyo, JP;
Abstract
A method, algorithm, software, architecture, circuit, and/or system for detecting an idle condition and maintaining a frequency of a clock/data recovery circuit are disclosed. In one embodiment, a method of maintaining a frequency of a clock/data recovery circuit can include the steps of: (i) comparing a difference value from a differential signal with a predetermined threshold (or value); (ii) controlling a variable frequency oscillator (VFO) with a frequency detector when the difference value is less than the threshold for at least a predetermined integration time; and (iii) controlling the VFO with a phase detector receiving the differential signal when the difference value is greater than the threshold. Embodiments of the present invention can advantageously provide a reliable and simplified design approach for clock data recovery (CDR) circuits operable with low power mode transmitters.