Amplifiers – With plural amplifier channels – Redundant amplifier circuits
Reexamination Certificate
2005-09-27
2005-09-27
Nguyen, Patricia (Department: 2817)
Amplifiers
With plural amplifier channels
Redundant amplifier circuits
C330S051000, C330S12400D, C330S302000
Reexamination Certificate
active
06949974
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.
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Hiroshi Okazaki et al., “Intermoduration in Switchless Amplifier Switching Configuration”, Proceedings of the 2001 IEICE General Conference of Japan, in Japanese, p. 81, with English translation, 4 pages.
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. Standley P.
Nguyen Patricia
Reed Smith LLP
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