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:
Nov. 13, 2001
Filed:
Aug. 16, 1999
Daniel J. Dolan, Jr., Cottage Grove, MN (US);
Scott K. Glenna, Shafer, MN (US);
Charles P. Jents, White Bear Township, MN (US);
Agere Systems Guardian Corp., Orlando, FL (US);
Abstract
A preamplifier chip for a disk drive is modular in layout. Twelve head cells for the preamplifier chip are not lined along the periphery of the chip, but rather are disposed in an array including four rows of three head cells each. The rows are all directed perpendicular to the side with control connection pads. The preferred embodiment allows for a smaller preamplifier chip through increasing the density of head cells on the chip relative to the periphery of the chip usable for head cell connection. The array spaces write portions of the head cells in four spaced lines, minimizing problems associated with heat build up. Spacing between rows of the array can be determined to take maximum advantage of lead pitch on the flex circuit. Modification of the design to a chip for eight or four channels is possible with minimal changes to the design, and minimal reworking of the common circuitry.