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:
Mar. 24, 2015
Filed:
Aug. 08, 2014
Lsi Technologies Inc., Allentown, PA (US);
Ross S. Wilson, Menlo Park, CA (US);
Jason S. Goldberg, Mendota Heights, MN (US);
Edwin X. Li, San Jose, CA (US);
Avago Technologies General IP (Singapore) Pte. Ltd., Singapore, SG;
Abstract
Individual magneto-resistive read elements are connected to the pre-amplifier through a multi-conductor transmission line; one side of each magneto-resistive read element is taken to a single common lead which is also received in the read pre-amplifier. Amplification and bias control are performed by the read pre-amplifier. A low-noise input stage amplifier configuration accommodates a shared common lead in a multi-head environment. Means for independently biasing the magneto-resistive read elements are also provided. Feedback loops are employed to regulate the operating points of the input stages, and to set the potential of the common head terminal. Two-dimensional magnetic recording system testability is enhanced by ability to multiplex any head to a single system output.