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. 28, 2004
Filed:
Mar. 03, 2003
Mehedi Hassan, Plano, TX (US);
Texas Instruments Incorporated, Dallas, TX (US);
Abstract
A circuit ( ) provides digital signals indicative of slew rates of phase signals ( ) of H-bridge power drive transistors ( ) of motor windings ( ) of a mass data storage device ( ). The circuit uses up and down phase control signals (UP,DN) to initiate up and down voltage changes in the motor phase signals. A portion of the circuit ( ) produces a state change in a phase status output signal ( ) when the phase signal ( ) is less than a supply voltage ( ). A digital comparison circuit ( ) compares the phase status output signal ( ) and the up and down control signals (UP,DN), and produces respective rise and fall digital outputs ( ) when the up and down phase control signals and the phase status output signal are the same. The respective rise and fall digital outputs ( ) have state change timings that indicate rise and fall times of said motor phase signals (