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. 14, 2006
Filed:
Jan. 24, 2005
Takashi Kawakubo, Kanagawa-ken, JP;
Ryoichi Ohara, Kanagawa-ken, JP;
Kazuhide Abe, Kanagawa-ken, JP;
Hiroshi Yoshida, Kanagawa-ken, JP;
Hiroshi Tsurumi, Kanagawa-ken, JP;
Takashi Kawakubo, Kanagawa-ken, JP;
Ryoichi Ohara, Kanagawa-ken, JP;
Kazuhide Abe, Kanagawa-ken, JP;
Hiroshi Yoshida, Kanagawa-ken, JP;
Hiroshi Tsurumi, Kanagawa-ken, JP;
Kabushiki Kaisha Toshiba, Tokyo, JP;
Abstract
A tunable filter has a plurality of variable capacitors and a plurality of inductor elements, each being formed on a common substrate, a filter circuit formed by using at least a portion of the plurality of variable capacitors and a portion of the plurality of inductor elements, a monitor circuit formed by using at least a portion of the plurality of variable capacitors and a portion of the plurality of inductor elements, a detecting circuit which detects a prescribed circuit constant of the monitor circuit, a storage which stores information relating to a reference circuit constant of the monitor circuit, and a capacitance control circuit which controls capacitance of the variable capacitors in the monitor circuit and capacitance of the variable capacitors in the filter circuit, based on a result detected by the detecting circuit and information stored in the storage.