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:
Aug. 11, 2009
Filed:
Jun. 16, 2005
Steven J. Baumgartner, Zumbro Falls, MN (US);
Anthony R. Bonaccio, Shelburne, VT (US);
Timothy C. Buchholtz, Rochester, MN (US);
Charles P. Geer, Rochester, MN (US);
Daniel G. Young, Rochester, MN (US);
Steven J. Baumgartner, Zumbro Falls, MN (US);
Anthony R. Bonaccio, Shelburne, VT (US);
Timothy C. Buchholtz, Rochester, MN (US);
Charles P. Geer, Rochester, MN (US);
Daniel G. Young, Rochester, MN (US);
International Business Machines Corporation, Armonk, NY (US);
Abstract
Techniques and apparatus for testing phase rotators for detecting defective tap weights are provided. Phase rotator test logic may include a master phase rotator to cycle the phase of a clock signal distributed to operational phase rotators through an entire cycle of phases (e.g., an entire 360 degree rotation). Each operational phase rotator should respond with an equal but opposite phase shift in order to maintain phase lock. Thus, after sweeping, each tap weight is exercised, which may help ensure defective tap weights in any (e.g., quadrant) are detected during testing.