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:
Jul. 29, 2003
Filed:
Sep. 12, 2001
Alfred W. Morse, Ellicott City, MD (US);
Gregory A. Arlow, Southampton, NJ (US);
Northrop Grumman Corporation, Los Angeles, CA (US);
Abstract
A source modulator circuit for an amplifier including a silicon carbide (SiC) static induction transistor (SIT) having a grounded gate, a source and a drain, includes: a source bias voltage supply connected to the source of the transistor; a drain voltage supply connected between the source and drain of the transistor; and a shunt circuit for directing current from the drain voltage supply around the source voltage supply to said source; whereby power dissipation by the source voltage supply is minimized. The shunt circuit includes a field effect transistor (FET) switch responsive to a control signal from a gated feedback operational amplifier for turning on the quiescent current of the SIT and setting the voltage applied to the source to a desired source voltage level.