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:
Apr. 24, 2007
Filed:
May. 13, 2003
Hai Nguyen, Sunnyvale, CA (US);
Yu-sheng (Stephen) Yang, Cupertino, CA (US);
Vuong Le, Milpitas, CA (US);
Hai Nguyen, Sunnyvale, CA (US);
Yu-Sheng (Stephen) Yang, Cupertino, CA (US);
Vuong Le, Milpitas, CA (US);
National Semiconductor Corporation, Santa Clara, CA (US);
Abstract
The present invention prevents the DLL from locking into the wrong phase, harmonic lock and hang. The detection is independent of temperature, voltage and process that the DLL is running. Including these mechanisms in the DLL design, the operating frequency range of the DLL can be extended significantly. Also many design blocks in the main loop can be reused for these additional circuitries, the design time of this DLL is much faster than to design a whole new hang or harmonic lock prevention circuitries.