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:
May. 26, 2015
Filed:
Aug. 30, 2013
Advanced Micro Devices, Inc., Sunnyvale, CA (US);
Ati Technologies Ulc, Markham, CA;
Saeed Abbasi, Valley Forge, PA (US);
Nima Gilanpour, Toronto, CA;
Michael R. Foxcroft, Toronto, CA;
George A. W. Guthrie, Mississauga, CA;
Raymond S. P. Tam, Richmond Hill, CA;
ADVANCED MICRO DEVICES, INC., Sunnyvale, CA (US);
ATI TECHNOLOGIES ULC, Markham, Ontario, unknown;
Abstract
A phase locked loop (PLL) includes a first loop, a second loop, and a lock detector. The first loop locks a feedback signal having a frequency equal to a fraction of a frequency of an output signal to a reference signal in phase. The first loop has a first bandwidth. The second loop locks the feedback signal to the reference signal in frequency and has a second bandwidth. The first bandwidth is higher than the second bandwidth. The lock detector is coupled to the second loop and increases the second bandwidth in response to detecting that the feedback signal is not locked to the reference signal.