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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.:

US 9166542 B1

PDFFull Text
Date of Patent:
Oct. 20, 2015

Filed:

Dec. 05, 2012

High frequency module and portable terminal using same

Applicant:

Murata Manufacturing Co., Ltd., Kyoto, JP;

Inventors:

Norio Hayashi, Kyoto, JP;

Satoshi Shimizu, Kyoto, JP;

Ryo Kadoi, Kyoto, JP;

Akio Yamamoto, Kyoto, JP;

Assignee:

MURATA MANUFACTURING CO., LTD., Kyoto, JP;

Attorney:

Pearne & Gordon LLP

Primary Examiner:

Patricia T Nguyen

Int. Cl.
CPC ...
H03F 3/04 (2006.01); H03F 3/45 (2006.01); H03F 1/56 (2006.01); H03F 3/195 (2006.01); H03F 3/24 (2006.01); H03F 3/50 (2006.01); H04B 1/04 (2006.01); H01Q 1/50 (2006.01); H03F 3/193 (2006.01); H03H 7/40 (2006.01);
U.S. Cl.
CPC ...
H03F 3/45071 (2013.01); H01Q 1/50 (2013.01); H03F 1/56 (2013.01); H03F 3/193 (2013.01); H03F 3/195 (2013.01); H03F 3/245 (2013.01); H03F 3/45183 (2013.01); H03F 3/50 (2013.01); H03H 7/40 (2013.01); H04B 1/0458 (2013.01); H03F 2003/45008 (2013.01); H03F 2200/108 (2013.01); H03F 2200/111 (2013.01); H03F 2200/222 (2013.01); H03F 2200/387 (2013.01); H03F 2203/45454 (2013.01); H03F 2203/45466 (2013.01); H03F 2203/45476 (2013.01); H03F 2203/45576 (2013.01); H03F 2203/45631 (2013.01); H03F 2203/45634 (2013.01); H03F 2203/45674 (2013.01);
Abstract

When the frequency bandwidth of a high frequency signal to be amplified is changed, the linearity of a high frequency module deteriorates. A high frequency module has an amplifier circuit including an amplification transistor and a variable impedance circuit, and an output matching network. Based on an amplifying operation, the amplified high frequency signal will contain unwanted signals of secondary distortion components. In a frequency band that generates such unwanted signals of secondary distortion components, the output impedance of the amplifier circuit is changed so that the impedance will not match between the amplifier circuit and the output matching network. The output impedance of the amplifier circuit is changed by controlling the variable impedance circuit.

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