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:
Aug. 28, 2001
Filed:
Nov. 20, 1998
Jente Benedict Kuang, Poughkeepsie, NY (US);
Pong-Fei Lu, Yorktown Heights, NY (US);
Mary Joseph Saccamango, Poughquag, NY (US);
International Business Machines Corporation, Armonk, NY (US);
Abstract
In a method and apparatus for reducing parasitic bipolar current in an insulated body, field effect transistor (“FET”), for an n-type FET, the body of the insulated body NFET is electrically isolated, responsive to turning on the NFET. This permits a charge to accumulate on the body in connection with turning the NFET on, temporarily lowering the threshold voltage for the insulated body NFET. Responsive to turning off the insulated body NFET, at least a portion of the charge on the body is discharged. This discharging of the body reduces parasitic bipolar current which would otherwise occur upon turning the NFET back on if the body had charged up during the time when the NFET was off. For a p-type FET that is susceptible to parasitic bipolar current, the body is discharged responsive to turning off the PFET, and isolated responsive to turning on the PFET.