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. 25, 2003
Filed:
Aug. 21, 2001
Applicant:
Inventor:
Nobuo Hareyama, Kanagawa, JP;
Assignee:
Sony Corporation, Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H03F 1/14 ;
U.S. Cl.
CPC ...
H03F 1/14 ;
Abstract
A matching apparatus for matching impedances of a power amplifier and an antenna of a terminal apparatus in which transmission power control (TPC) is carried out between a base station and a portable wireless telephone set. The matching apparatus can transmit output power at excellent output efficiency regardless of the magnitude of the power of transmission output. A matching circuit provided between a power amplifier and a load includes a switching device, and impedances are switched and controlled by the switching device such that the impedances are suited to the transmission output power required for TPC and are properly matched.