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. 09, 2000
Filed:
Apr. 08, 1998
Applicant:
Inventor:
Chao-Ming Tsai, Sunnyvale, CA (US);
Assignee:
Winbond Electronics Corporation, Hsinchu, TW;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H03L / ; H03L / ;
U.S. Cl.
CPC ...
331 11 ; 331 / ; 331 / ; 331 17 ; 331 25 ; 331 27 ;
Abstract
A PLL response time is accelerated with a frequency detector counter. The PLL utilizes both a phase frequency detector and the frequency detector counter. Initially, the operation of the PLL is controlled by the frequency detector counter and the output of phase frequency detector does not affect the PLL system. During this period, the PLL synchronizes to an input clock frequency. After the PLL reaches a predetermined frequency range, the frequency detector counter stops working. Thereafter, the phase frequency detector controls the operation of the PLL. During this period, the PLL synchronizes to both the frequency and the phase of the input signal.