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:
Jul. 08, 2014
Filed:
Jul. 24, 2012
Paul Mazur, Cottage Grove, MN (US);
Robert A. Norman, Bloomington, MN (US);
Jeffrey A. Gleason, Burnsville, MN (US);
Anamul Hoque, Lakeville, MN (US);
Paul Mazur, Cottage Grove, MN (US);
Robert A. Norman, Bloomington, MN (US);
Jeffrey A. Gleason, Burnsville, MN (US);
Anamul Hoque, Lakeville, MN (US);
LSI Corporation, San Jose, CA (US);
Abstract
A hard disk drive or other disk-based storage device comprises a storage disk, a write head configured to write data to the disk, and control circuitry coupled to the write head. The control circuitry comprises a write driver and degauss circuitry associated with the write driver. The degauss circuitry is configured to generate a chirped degauss signal to be applied to the write head by the write driver. The degauss circuitry comprises a ramp generator configured to generate a ramp signal for controlling a frequency of at least a portion of a waveform of the chirped degauss signal. The ramp signal generated by the ramp generator may comprise a current ramp that is applied to a control input of a current controlled oscillator of the degauss circuitry.