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:
Nov. 14, 2006
Filed:
May. 16, 2003
Tao Zhang, Shakopee, MN (US);
John Christopher Morris, Eden Prairie, MN (US);
Dustin Mark Cvancara, St. Paul, MN (US);
Raye Abdoulie Sosseh, Oklahoma City, OK (US);
Tao Zhang, Shakopee, MN (US);
John Christopher Morris, Eden Prairie, MN (US);
Dustin Mark Cvancara, St. Paul, MN (US);
Raye Abdoulie Sosseh, Oklahoma City, OK (US);
Seagate Technology LLC, Scotts Valley, CA (US);
Abstract
An apparatus and method of maintaining stability in a servo loop of a disc drive is provided. A dither signal (a single frequency sine wave or a multi-frequency signal) is injected into the servo loop. A servo loop gain error signal is obtained in response to the injected dither signal. A gain of the servo loop is adjusted as a function of the servo loop gain error signal in real-time.