Amplifiers – With plural amplifier channels – Amplifying different frequencies in different channels
Reexamination Certificate
2006-10-17
2006-10-17
Nguyen, Patricia (Department: 2817)
Amplifiers
With plural amplifier channels
Amplifying different frequencies in different channels
C330S302000, C330S295000
Reexamination Certificate
active
07123087
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 M12and first-stage matching network M13to respective output nodes of a power amplifier unit A11and power amplifier unit A12that either one operate by switching, connecting the output nodes of the first-stage matching network M12and M13in parallel, connecting a last-stage matching network M11between the junction of M12and M13and the output terminal OUT, the first-stage matching networks M12, M13, and last-stage matching network M11are formed, for both power amplifier units A11and 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.
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Hiroshi Okazaki et al., “Efficient Transmission-Power-Control Scheme for Ku-Band High Power Amplifiers in Portable User Earth Terminals”, IEEE Transactions on Microwave Theory and Techniques, vol. 49, No. 6, Jun. 2001, pp. 1167-1173.
Kagaya Osamu
Matsumoto Hidetoshi
Ohnishi Masami
Sekine Kenji
Tanoue Tomonori
A. Marquez, Esq. Juan Carlos
Fisher Esq. Stanley P.
Nguyen Patricia
Reed Smith LLP
Renesas Technology Corp.
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