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. 30, 2006
Filed:
Jun. 29, 2001
Tao Zhang, Kingston, CA;
Kevin Arthur Gomez, Singapore, SG;
Qiang BI, Singapore, SG;
Mingzhong Ding, Singapore, SG;
Stephen Kow Chiew Kuan, Singapore, SG;
Tao Zhang, Kingston, CA;
Kevin Arthur Gomez, Singapore, SG;
Qiang Bi, Singapore, SG;
MingZhong Ding, Singapore, SG;
Stephen Kow Chiew Kuan, Singapore, SG;
Seagate Technology LLC, Scotts Valley, CA (US);
Abstract
An apparatus and method for improving servo loop performance in a disc drive storage system are provided. The servo loop includes a voice coil motor actuator that moves the head in response to a received servo control signal. A sensor, located in the head, senses servo information located on the disc and produces a servo signal therefrom. The servo signal is combined with a reference signal to produce a position error signal. A servo controller receives the position error signal and responsively produces the servo control signal. The servo controller includes a drive signal generator that receives the position error signal and responsively produces a driving energy signal. A vibration damping circuit receives the driving energy signal and responsively produces the servo control signal. A real-time adaptive loop shaping circuit, included in the servo loop, detects vibrations in the position error signal and responsively adjusts at least one parameter of a transfer function of the vibration damping circuit to reduce vibrations at different frequencies in the driving energy signal.