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:
Mar. 22, 2016
Filed:
Feb. 14, 2014
Apple Inc., Cupertino, CA (US);
Jong-Suk Lee, Sunnyvale, CA (US);
Shih-Chieh R. Wen, San Jose, CA (US);
Toshinari Takayanagi, San Jose, CA (US);
Wei-Han Lien, San Jose, CA (US);
Apple Inc., Cupertino, CA (US);
Abstract
A method and apparatus for achieving fast PLL lock when exiting a low power state is disclosed. In one embodiment, a method includes operating a PLL in a first state in which the PLL is locked to a first frequency. The method further includes programming the PLL to operate in a second state in which the PLL is locked to a second frequency. The programming may occur while the PLL is operating in the first state, and the PLL may continue operating in the first state after programming is complete. Thereafter, the PLL may be transitioned from the first state to a low power state. Upon exiting the low power state, the PLL may transition directly to the second state, locking to the second frequency, without having to transition to the first state or lock to the first frequency.