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:
Mar. 09, 1999
Filed:
Dec. 02, 1996
Douglas Warren Dean, Eagan, MN (US);
VTC, Inc., Bloomington, MN (US);
Abstract
An active damping system for reducing the ringing effects in write current signals flowing through a write head of a disk drive write circuit. The active damping system stores a voltage related to the write current, sinks write current from a terminal of the write head in response to a predetermined rate of increase in the stored voltage, and provides a high impedance to the terminal when the rate of increase of stored voltage is below the predetermined rate. The active damping system preferably includes a transistor connected between the write head terminal and a common electrical potential, a capacitor connected between the terminal and a base of the transistor, and a resistor connected between the base of the transistor and the common electrical potential.