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. 07, 2002
Filed:
Mar. 23, 2000
Curtis A. Barratt, Greensboro, NC (US);
Arthur E. Geissberger, Greensboro, NC (US);
Larry W. Kapitan, Summerfield, NC (US);
Michael T. Fresina, Greensboro, NC (US);
Ramond Jeffrey Vass, Greensboro, NC (US);
RF Micro Devices, Inc., Greensboro, NC (US);
Abstract
A voltage variable resistor formed on heterojunction bipolar transistor epitaxial material includes a current channel made on emitter material. Emitter mesas separated by a recess provide the contacts for the voltage variable resistor. Each mesa is topped with emitter metal forming the resistor contacts. The emitter mesas are layered on top of the current channel that is layered atop of a base layer. The voltage variable resistor's control contact is provided by a base contact located on the base layer and separated from the current channel.