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:
May. 19, 1992
Filed:
Aug. 08, 1991
Applicant:
Inventors:
Alan S Rohulich, Endwell, NY (US);
Ronnie A Wunderlich, Endicott, NY (US);
Assignee:
International Business Machines, Armonk, NY (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H03K / ; H03K / ; H03K / ; H01J / ;
U.S. Cl.
CPC ...
307571 ; 307573 ; 307574 ; 307270 ; 307443 ; 328223 ;
Abstract
A drive circuit for a P-channel FET is provided which uses a switch means to bias the P-channel FET into conduction and passive components to bias the P-channel FET out of conduction, reducing the components required in the drive circuit and the power dissipated. Energy stored in an inductor while the P-channel FET is conducting is used to provide current through a capacitor in series with the gate to source capacitance of the P-channel FET reducing the stored charge and turning off the P-channel FET.