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:
Jul. 07, 2009
Filed:
Sep. 16, 2005
David Meltzer, Wappinger Falls, NY (US);
David Meltzer, Wappinger Falls, NY (US);
Seiko Epson Corporation, Tokyo, JP;
Abstract
Circuits and methods for recovering a periodic signal from a data signal. One circuit generally includes (1) a recovery circuit configured to produce a reference signal from the data signal, (2) a frequency detector circuit configured to produce a detector output in response to the reference signal and a recovered periodic signal, (3) a decision circuit configured to produce a decision output in response to the detector output and the recovered periodic signal (or a periodic derivative of that signal), and (4) a charge pump configured to produce a pump output, where the level of the pump output corresponds to a value of the decision output. The circuits and methods generally include those that embody one or more of the inventive concepts disclosed herein. The present invention advantageously provides smooth signal acquisition without use of an external clock.