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:
Dec. 20, 2011
Filed:
Jul. 13, 2010
Weicheng Zhang, Shanghai, CN;
Ming Shi, Shanghai, CN;
Wei-hua Zou, Shanghai, CN;
Shu-sun Yu, Cupertino, CA (US);
Chieh-yuan Chao, Fremont, CA (US);
Weicheng Zhang, Shanghai, CN;
Ming Shi, Shanghai, CN;
Wei-Hua Zou, Shanghai, CN;
Shu-Sun Yu, Cupertino, CA (US);
Chieh-Yuan Chao, Fremont, CA (US);
Amlogic Co., Ltd., Santa Clara, CA (US);
Abstract
A method for digital phase detection, comprises the steps of: providing a reference clock; receiving a feedback clock; determining a timing difference between the reference clock and the feedback clock; determining a polarity that indicates the leading or lagging relationship between the reference clock and the feedback clock; adaptively selecting one of at least two operating modes for generating a quantized level indicative of the timing difference, wherein in a first operating mode the quantized level is a constant maximum value and wherein in a second operating mode the quantized level is proportional to the timing difference; and generating a digital phase detection output as a combination of the polarity and the quantized level.