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:
Jul. 20, 2010
Filed:
Aug. 06, 2008
Gang Zhang, San Diego, CA (US);
Gang Zhang, San Diego, CA (US);
QUALCOMM Incorporated, San Diego, CA (US);
Abstract
Techniques for converting an accumulated phase of a signal into a digital value in a digital phase-locked loop (DPLL). In an exemplary embodiment, a signal is coupled to a divide-by-N module that divides the frequency of the signal down by a divider ratio N. The divided signal is input to a delta phase-to-digital converter, which measures the phase difference between a rising edge of the divided signal and a rising edge of a reference signal. The accumulated divider ratios and the measured phase differences are combined to give an accumulated digital phase. Further techniques for varying the divider ratio N using a sigma-to-delta modulator are disclosed.