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:
Feb. 05, 2008
Filed:
Sep. 23, 2005
Applicants:
David Kwong, Fremont, CA (US);
Trung Tran, Sunnyvale, CA (US);
Inventors:
David Kwong, Fremont, CA (US);
Trung Tran, Sunnyvale, CA (US);
Assignee:
Cypress Semiconductor Corp., San Jose, CA (US);
Attorneys:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G01R 35/00 (2006.01);
U.S. Cl.
CPC ...
Abstract
According to one embodiment, a phase-locked loop (PLL) device includes test circuitry for entering/exiting a test mode upon receiving a particular pulse train at a reference clock input of the PLL. In addition, exemplary methods are provided herein for entering a test mode and detecting loop filter leakage within the PLL. The methods described herein are performed without the use of a dedicated test pin.