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:
Sep. 02, 2003
Filed:
Jan. 31, 2002
Mehedi Hassan, Plano, TX (US);
Texas Instruments Incorporated, Dallas, TX (US);
Abstract
A circuit combination ( ) is presented for providing digital signals indicative of slew rates of drive signals ( ) provided to H-bridge power drive transistors ( ) of motor windings ( ) of a mass data storage device ( ). The circuit combination includes a plurality of predriver circuits ( ) producing predrive signals according to a commutation sequence for connection to respective the power drive transistors ( ). A multiplexer ( ) is connected to selectively direct at least some of the drive signals to a multiplexer output port, and a digital comparison circuit ( ) receives the at least some drive signals from the multiplexer output port and produces a digital outputs ( ) having state time changes in dependence upon rise and fall times of the predriver output signals.