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:
Apr. 29, 2008
Filed:
Jun. 02, 2006
Paul T. Bennett, Phoenix, AZ (US);
Randall C. Gray, Tempe, AZ (US);
Matthew D. Thompson, Chandler, AZ (US);
Paul T. Bennett, Phoenix, AZ (US);
Randall C. Gray, Tempe, AZ (US);
Matthew D. Thompson, Chandler, AZ (US);
Freescale Semiconductor, Inc., Austin, TX (US);
Abstract
Apparatus and methods that reduce the amount of conducted/radiated emissions from a power switch () when a transistor () is switched OFF are disclosed. In addition, apparatus and methods that reduce the slew rate in a power switch when the power switch is switched off are disclosed. The apparatus comprises a transistor () including an inductive load () coupled to the transistor, a plurality of current sources () coupled to the gate of the transistor, and a clamp () coupled to either the gate and the drain of the transistor, or to the gate and to ground depending on the location of the inductive load, wherein the clamp comprises a resistive element () to increase the voltage of the clamp when current flows through the clamp, and wherein the increased voltage causes the apparatus to include a different slew rate.