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. 01, 2023
Filed:
Dec. 29, 2021
Western Digital Technologies, Inc., San Jose, CA (US);
Richard Galbraith, Rochester, MN (US);
Niranjay Ravindran, Rochester, MN (US);
Iouri Oboukhov, Rochester, MN (US);
Pradhan Bellam, Rochester, MN (US);
Henry Yip, Bellflower, CA (US);
Jonas Goode, Lake Forest, CA (US);
Weldon M. Hanson, Rochester, MN (US);
Western Digital Technologies, Inc., San Jose, CA (US);
Abstract
Example systems, read channel circuits, data storage devices, and methods to provide signal correction based on soft information in a read channel are described. The read channel circuit includes a soft output detector, such as a soft output Viterbi algorithm (SOVA) detector, and a signal correction circuit. The soft output detector passes detected data bits and corresponding soft information to the signal correction circuit. The signal correction circuit uses the soft information to determine a signal correction value, which is combined with input signal to return a corrected signal to the soft output detector for a next iteration. In some configurations, the signal correction value may compensate for DC offset, AC coupling poles, and/or signal asymmetries to reduce baseline wander in the read channel.