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. 22, 2018
Filed:
Feb. 10, 2017
Apple Inc., Cupertino, CA (US);
Wei Deng, San Jose, CA (US);
Dennis M. Fischette, Jr., Mountain View, CA (US);
Meei-Ling Chiang, Cupertino, CA (US);
Samed Maltabas, Santa Clara, CA (US);
Apple Inc., Cupertino, CA (US);
Abstract
A digital PLL is disclosed. In one embodiment, the digital PLL includes a TDC coupled to receive a reference clock signal and feedback signal. The TDC includes a chain of serially-coupled delay elements. An oscillator in the PLL is configured to generate a periodic output signal. A divider is coupled to receive the periodic output signal and generate the feedback signal provided to the TDC. The digital PLL also includes a control circuit. During a phase-locking procedure, each of the serially-coupled delay elements is enabled for fast phase capture. However, once phase-lock has been detected by observing TDC output code, the control circuit is adaptively configured to disable all but a subset of the delay elements for saving power.