公开(公告)号：US20230290398A1

公开(公告)日：2023-09-14

申请号：US17694442

申请日：2022-03-14

Applicant: Seagate Technology LLC

Inventor： Walter R. EPPLER ,  Drew Michael MADER

IPC: G11C11/16 ,  H03M1/06

CPC classification number: G11C11/1673 ,  G11C11/1675 ,  G11C11/1677 ,  G11C11/1693 ,  H03M1/0636

Abstract: A method for reducing noise in a read signal due attributable to read element asymmetry provides for transmitting a write signal through a write precompensation circuit that shifts rising edges and falling edges of each of pulse in the write signal by a select magnitude and in opposite directions. After the write signal is encoded on a media, a corresponding read signal is read, with a read element, from the media. The method further provides for transmitting the read signal through a magnetoresistive asymmetry compensation (MRAC) block that is tuned to correct second-order non-linearities characterized by a particular set of distortion signatures. The select magnitude of the waveform shift applied by the write precompensation circuit introduces a non-linear signal characteristic that combines with non-linear signal characteristics introduced by the read element to generate one of the particular distortion signatures that is correctable by the MRAC block.