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:
Nov. 02, 1999
Filed:
Apr. 03, 1998
Carlton D Davis, Baltimore, MD (US);
Jack J Hawkins, Ellicott City, MD (US);
CBS Corporation, Pittsburgh, PA (US);
Abstract
A preamplifier system (10) is provided which amplifies and conditions an input electromagnetic signal for insertion into a high power amplifier. The preamplifier system (10) includes a plurality of cascaded amplifying stages (100a-100d) for incrementally amplifying the input electromagnetic signal, as well as bias control circuitry coupled to the amplifying stages (100a-100d) to electrically bias at least one of those stages into a Class A operational mode and an adjustable phase shift unit (300) coupled to at least one of the amplifying stages (100a-100d) for reversibly shifting the phase of the input electromagnetic signal in accordance with the given high power amplifier's configuration. Each amplifying stage (100a-100d) includes at least one transistor assembly device (110a-110d) having integrally formed therein a plurality of silicon carbide cells coupled one to the other. The amplifying stages (100a-100d) collectively operate in stable, substantially linear manner to effect a predetermined level of gain in high power applications.