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:
Apr. 20, 2010
Filed:
Sep. 14, 2006
Jason A. Christianson, Apple Valley, MN (US);
David W. Kelly, Eagan, MN (US);
Michael John O'brien, St. Paul, MN (US);
Cameron Carroll Rabe, Inver Grove Heights, MN (US);
Jason A. Christianson, Apple Valley, MN (US);
David W. Kelly, Eagan, MN (US);
Michael John O'Brien, St. Paul, MN (US);
Cameron Carroll Rabe, Inver Grove Heights, MN (US);
Agere Systems Inc., Allentown, PA (US);
Abstract
An apparatus and method for controlling the common mode voltage across a data storage device write head. The write current is supplied by a first plurality of parallel current sources each independently activated to limit the common mode voltage generated across the write head. A plurality of parallel resistive elements responsive to current supplied by a second plurality of parallel current sources bias an output transistor that further controls the write current. Each of the plurality of parallel resistive elements and each of the second plurality of parallel current sources is also independently activated to limiting the common mode voltage generated across the write head.