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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.:

US 8619382 B1

PDFFull Text
Date of Patent:
Dec. 31, 2013

Filed:

Aug. 09, 2012

High speed, low power write current switching scheme for hdd preamplifier

Applicant:

Jeremy Robert Kuehlwein, Woodbury, MN (US);

Inventor:

Jeremy Robert Kuehlwein, Woodbury, MN (US);

Assignee:

Texas Instruments Incorporated, Dallas, TX (US);

Attorneys:

Alan A. R. Cooper

W. James Brady, III

Frederick J. Telecky, Jr.

Primary Examiner:

Will J Klimowicz

Assistant Examiner:

Mark Fischer

Int. Cl.
CPC ...
G11B 5/02 (2006.01);
U.S. Cl.
CPC ...
Abstract

A hard drive write preamplifier includes a first differential pair of PNP BJTs having a first PNP BJT and a second PNP BJT; a first tail current source coupled into emitter of the PNP BJTs of the first differential pair; a second differential pair of NPN BJTs having a first NPN BJT and a second NPN BJT; a second tail current source coupled into the emitters of the NPN BJTs of the second differential pair; wherein a collector of each of the PNP BJTs of the first differential pair are coupled to a corresponding collector the NPN BJTs of the second differential pair; a first shift up PNP BJT having emitter coupled to the collector of a first PNP BJT of the first differential pair; a second shift up PNP BJT having an emitter coupled to the collector of the second PNP BJT of the first differential pair.

Find Patent Forward Citations

Kuehlwein, Jeremy. (2013). High speed, low power write current switching scheme for hdd preamplifier (U.S. Patent No. 8619382). U.S. Patent and Trademark Office. https://idiyas.com/patent/badge/8619382

Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile

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