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Title:
VARIABLE CAPACITANCE ELEMENT AND FILTER CIRCUIT
Document Type and Number:
Japanese Patent JP2009295969
Kind Code:
A
Abstract:

To efficiently vary the capacitance of a variable capacitance element using a metal oxide film.

The variable capacitance element includes: the metal oxide film having a perovskite structure; a first and a second electrode film having the metal oxide film placed therebetween and to be coupled to an external voltage source; and a bias voltage source electrically inserted in series to the capacitor including the metal oxide film, and the first and second electrode films. The bias voltage source applies the bias voltage maximizing a voltage dependency of relative permittivity of the metal oxide film to the capacitor.


Inventors:
Baniecki, John
Ishii, Masatoshi
Kurihara, Kazuaki
Yamanaka, Kazunori
Application Number:
JP2009000107778
Publication Date:
December 17, 2009
Filing Date:
April 27, 2009
Export Citation:
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Assignee:
FUJITSU LTD
International Classes:
H01L21/822; H01G7/06; H01L21/8242; H01L21/8246; H01L27/04; H01L27/105; H01L27/108
Domestic Patent References:
JP2006128302A2006-05-18
JP2004031408A2004-01-29
JPH0613572A1994-01-21
JP2006073850A2006-03-16
Attorney, Agent or Firm:
伊東 忠彦
山口 昭則