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:
Oct. 12, 1999
Filed:
Sep. 03, 1997
David Lewis Stolfa, Phoenix, AZ (US);
Kenneth D Cornett, Coral Springs, FL (US);
Motorola, Inc., Schaumburg, IL (US);
Abstract
A voltage variable capacitor (10) fabricated on a semiconductor substrate (11) includes a gate structure (62) and a well (22) under the gate structure (62). A heavily doped buried layer (15) and a heavily doped contact region (31) in the semiconductor substrate (11) form a low resistance conduction path from the well (22) to a surface (17) of the semiconductor substrate (11). A multi-finger layout is used to construct the voltage variable capacitor (10). In operation, when a voltage applied across the voltage variable capacitor (10) changes, the width of depletion region in the well (22) changes, and the capacitance of the voltage variable capacitor (10) varies accordingly.