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:
Aug. 19, 2003
Filed:
May. 08, 2000
Klaas Berend Klaassen, San Jose, CA (US);
Jacobus Cornelis Leonardus Van Peppen, San Jose, CA (US);
International Business Machines Corporation, Armonk, NY (US);
Abstract
An interconnect circuit for a readout channel front-end for a disk drive is disclosed that includes a forward line and a return line. Both the forward line and the return line have a first end and a second end. The first end of both the forward line and the return line is connectable to a magnetoresistive head. The second end of both the forward line and the return line is connectable to a single-ended preamplifier. The return line is arranged to be disposed between the forward line and a suspension for a magnetoresistive head. The forward trace has a first predetermined width and the return trace has a second predetermined width that can be the same or different from the first predetermined width. When the interconnect circuit is in a disk drive, the first end of the forward line is connected to a magnetoresistive head, and the second end of the forward line is connected to a single-ended preamplifier. Similarly, the first end of the return line is connected to the magnetoresistive head, and the second end of the return line is connected to the single-ended preamplifier. The return line is disposed between the forward line and a suspension for the magnetoresistive head. The characteristic impedance of the interconnect circuit is selected to be about equal to an input resistance of the single-ended preamplifier. Accordingly, the high-frequency roll-off of a transfer characteristic of the interconnect circuit is primarily determined by a high-frequency skin-effect loss in each of the forward and return lines, and the transfer characteristic of the interconnect circuit does not exhibit a ¼ wavelength effect notch.