US 11,900,970 B2
Magnetoresistive asymmetry compensation
Jason Bellorado, San Jose, CA (US); Marcus Marrow, San Jose, CA (US); and Zheng Wu, Los Altos, CA (US)
Assigned to Seagate Technology LLC, Fremont, CA (US)
Filed by Seagate Technology LLC, Fremont, CA (US)
Filed on Jan. 29, 2021, as Appl. No. 17/162,218.
Prior Publication US 2022/0246171 A1, Aug. 4, 2022
Int. Cl. G11B 5/09 (2006.01); G06F 13/38 (2006.01); H03M 1/12 (2006.01); G11B 5/00 (2006.01)
CPC G11B 5/09 (2013.01) [G06F 13/385 (2013.01); H03M 1/12 (2013.01); G11B 2005/0013 (2013.01)] 20 Claims
OG exemplary drawing
 
1. An apparatus comprising: a continuous-time front end (CTFE) configured to: receive an analog signal; perform first magnetoresistive asymmetry (MRA) compensation on the analog signal to adjust a dynamic range of the analog signal based on an input range of an analog-to-digital converter (ADC); the ADC, configured to convert the analog signal to a digital sample sequence; and a digital MRA compensation circuit configured to perform second MRA compensation to correct residual MRA in the digital sample sequence; a magnetic disc storage medium; a read element configured to: detect a magnetic field from the magnetic disc storage medium; generate the analog signal based on the magnetic field; provide the analog signal to the CTFE; and a read/write channel including the CTFE, the ADC, and the digital MRA compensation circuit.