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:
Mar. 15, 2005
Filed:
Jun. 09, 2003
Applicants:
Akira Asai, Osaka, JP;
Teruhito Ohnishi, Hirakata, JP;
Inventors:
Akira Asai, Osaka, JP;
Teruhito Ohnishi, Hirakata, JP;
Assignee:
Matsushita Electric Industrial Co., Ltd., Osaka, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H01L021/20 ;
U.S. Cl.
CPC ...
Abstract
A variable capacitance device comprising, in a semiconductor layer formed on a substrate via an buried oxide film: an n− regionformed in the shape of a ring and containing an n-type dopant; an anodeadjoined to the outer periphery of the n− regionthe anodebeing formed in the shape of a ring and containing a p-type dopant; and a cathodeadjoined to the inner periphery of the n− regionthe third region containing an n-type dopant, wherein the dopant concentration in the n− regionis lower than that in each of the anodeand the cathode