公开(公告)号：US10381036B1

公开(公告)日：2019-08-13

申请号：US15136829

申请日：2016-04-22

Applicant: Seagate Technology LLC

Inventor： Todd Michael Lammers ,  Abdelkrim Tatah ,  Tim Rausch ,  Robert Matousek

IPC: G11B7/126 ,  G06F13/42 ,  G06F3/06 ,  H03F17/00 ,  G11B5/00 ,  H01S3/13

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.