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:
Feb. 22, 2005
Filed:
Feb. 28, 2003
Saeed Abbasi, Narberth, PA (US);
Martin E. Perrigo, Newton, PA (US);
Carol A. Price, Jamison, PA (US);
Saeed Abbasi, Narberth, PA (US);
Martin E. Perrigo, Newton, PA (US);
Carol A. Price, Jamison, PA (US);
ATI Technologies, Inc., Thornhill, CA;
Abstract
A phase locked loop (PLL) circuit adjusts a voltage controlled differential oscillator to generate an output frequency signal that is a selected multiple of an input reference signal. An oscillator control circuit increases and decreases the output frequency signal. A frequency detector detects a phase shift between the reference signal and the PLL output signal and produces an error signal. In response to the error signal, a fast lock circuit detects when the output frequency signal passes the selected multiple of the reference signal.