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:
Oct. 17, 2006
Filed:
Sep. 21, 2005
Masami Ohnishi, Hachioji, JP;
Hidetoshi Matsumoto, Kokubunji, JP;
Tomonori Tanoue, Machida, JP;
Osamu Kagaya, Tokyo, JP;
Kenji Sekine, Hinode, JP;
Masami Ohnishi, Hachioji, JP;
Hidetoshi Matsumoto, Kokubunji, JP;
Tomonori Tanoue, Machida, JP;
Osamu Kagaya, Tokyo, JP;
Kenji Sekine, Hinode, JP;
Renesas Technology Corp., Chiyoda-ku, JP;
Abstract
The present invention provides a radio frequency power amplifier which may not introduce radio frequency loss during switching power amplifier units between high and low output power levels. By connecting a first-stage matching network Mand first-stage matching network Mto respective output nodes of a power amplifier unit Aand power amplifier unit Athat either one operate by switching, connecting the output nodes of the first-stage matching network Mand Min parallel, connecting a last-stage matching network Mbetween the junction of Mand Mand the output terminal OUT, the first-stage matching networks M, M, and last-stage matching network Mare formed, for both power amplifier units Aand A, so that impedance matching is established between the output terminal OUT and the power amplifier unit in operation when one unit is in operation the other is in stop of operation. The present invention allows switching from one power amplifier unit to the other without the need of a radio frequency switch.