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. 13, 2019
Filed:
Apr. 22, 2016
Applicant:
Seagate Technology Llc, Cupertino, CA (US);
Inventors:
Todd Michael Lammers, Lafayette, CO (US);
Abdelkrim Tatah, Eden Prairie, MN (US);
Tim Rausch, Farmington, MN (US);
Robert Matousek, Berthoud, CO (US);
Assignee:
Seagate Technology LLC, Cupertino, CA (US);
Attorneys:
Primary Examiner:
Int. Cl.
CPC ...
G11B 7/126 (2012.01); G06F 13/42 (2006.01); G06F 3/06 (2006.01); H03F 17/00 (2006.01); G11B 5/00 (2006.01); H01S 3/13 (2006.01);
U.S. Cl.
CPC ...
G11B 7/126 (2013.01); G06F 3/06 (2013.01); G06F 13/42 (2013.01); G11B 2005/0021 (2013.01); H01S 3/13 (2013.01); H03F 17/00 (2013.01);
Abstract
Systems and methods of laser bias calibration are presented. A preamplifier circuit may include a laser voltage monitor circuit and a laser bias control circuit configured to automatically adjust an output laser bias threshold voltage based on a monitored laser voltage. The laser bias control circuit may include a first differentiator circuit, a second differentiator circuit, and a threshold detection circuit. The preamplifier circuit may be utilized in a heat assisted magnetic recording device.