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, 2011
Filed:
Nov. 30, 2006
Kazutomi Mori, Chiyoda-ku, JP;
Kazuhiro Iyomasa, Chiyoda-ku, JP;
Akira Ohta, Chiyoda-ku, JP;
Teruyuki Shimura, Chiyoda-ku, JP;
Masatoshi Nakayama, Chiyoda-ku, JP;
Kazutomi Mori, Chiyoda-ku, JP;
Kazuhiro Iyomasa, Chiyoda-ku, JP;
Akira Ohta, Chiyoda-ku, JP;
Teruyuki Shimura, Chiyoda-ku, JP;
Masatoshi Nakayama, Chiyoda-ku, JP;
Mitsubishi Electric Corporation, Tokyo, JP;
Abstract
Provided is a high frequency amplifier including two amplifying elements of different element sizes connected in parallel and switching the amplifying elements in accordance with a level of output power. In particular, the high frequency amplifier includes an output matching circuit for matching to characteristic impedance (50 ohms) both when the output power is high and low, and increasing impedance when the turned-off amplifying element is viewed from a connection node on an output side of the two amplifying elements. Consequently, characteristics such as high output power and high efficiency can be achieved and it is possible to prevent an amplified high frequency signal from passing around to a matching circuit on a turned-off amplifying element side.