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:
Sep. 27, 2005
Filed:
Dec. 29, 2004
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., Tokyo, 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 M12 and first-stage matching network M13 to respective output nodes of a power amplifier unit A11 and power amplifier unit A12 that either one operate by switching, connecting the output nodes of the first-stage matching network M12 and M13 in parallel, connecting a last-stage matching network M11 between the junction of M12 and M13 and the output terminal OUT, the first-stage matching networks M12, M13, and last-stage matching network M11 are formed, for both power amplifier units A11 and A12, 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.