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:
Nov. 11, 2003
Filed:
Nov. 18, 1999
William J. Ulrich, III, Baltimore, MD (US);
Mark Lucas, Linthicum, MD (US);
Cecil Smith, Annapolis, MD (US);
Bradley Kanack, Sykesville, MD (US);
Ciena Corporation, Linthicum, MD (US);
Abstract
In accordance with an aspect of the present invention, a circuit is provided which is configured to recover clock and data streams from an incoming signal. The circuit comprises a multiplexer having first and second inputs, and an output. The first input is configured to receive the incoming signal, and the second input is configured to receive a reference clock signal, while the output selectively supplies one of the incoming and reference clock signals. A toggling circuit, such as a flip-flop, and a frequency multiplier circuit are further provided which are coupled to the multiplexer output. A filter circuit is coupled to the frequency multiplier circuit, and the output of the filter circuit is coupled to a second input of the toggling circuit. Moreover, the output of the filtering circuit corresponds to the recovered clock stream, and an output of the toggling circuit corresponds to the recovered data stream.