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:
May. 11, 2004
Filed:
Oct. 29, 2001
Tuan Van Ngo, Eden Prairie, MN (US);
Raymond Elijah Barnett, Apply Valley, MN (US);
Scott Gary Sorenson, Lakeville, MN (US);
Texas Instruments Incorporated, Dallas, TX (US);
Abstract
A write drive circuit ( ) for a hard disk drive selectively providing a current mode operation for high speed data write of a single channel, and selectively providing a voltage mode operation during a servo write operation. A central buffer has a first circuit ( ) providing a current mode drive signal to a head during a single channel write operation, and a second circuit ( ) providing a voltage mode drive signal for multi-channel servo write operation. The outputs of both circuits ( ) is provided over a common differential connection (T ) feeding a pre-driver circuit ( ) adapted to drive one or many heads, as determined by head select control lines ( ). The circuit provides >1.6 Gb/s data write speed in single channel write operation, and has an architecture utilizing only two signal lines for four channels.