Power amplifier

Details Power amplifier Power amplifier

2007-03-20

2007-03-20

Choe, Henry (Department: 2817)

Amplifiers

With semiconductor amplifying device

Including plural amplifier channels

C330S12400D

Reexamination Certificate

active

11066765

ABSTRACT:
In a power amplifier a Doherty amplifier is provided with an output higher harmonic reflection circuit that is connected to the output terminal of a first FET chip and sets an even-numbered higher harmonic load of an output signal at the output terminal to be a short-circuit, or at a low impedance approximating a short-circuit, and sets an odd-numbered higher harmonic load of an output signal at the output terminal to be an open-circuit, or a high impedance approximating an open-circuit.

REFERENCES:
patent: 5420541 (1995-05-01), Upton et al.
patent: 5568086 (1996-10-01), Schuss et al.
patent: 6617929 (2003-09-01), Kim et al.
patent: 6853245 (2005-02-01), Kim et al.
patent: 6861907 (2005-03-01), Gotou
patent: WO 97/20385 (1997-06-01), None
Doherty, W.H.; “A New High Efficiency Power Amplifier for Modulated Waves”,Proc. IRE, vol. 24, No. 9, pp. 1163-1182, (Sep. 1936).
Raab, F.H.; “Efficiency of Doherty RF Power-Amplifier Systems”,IEEE Trans. Broadcast, vol. BC-33, No. 3, pp. 77-83, (Sep. 1987).
Iwamoto, M. et al.; “An Extended Doherty Amplifier With High Efficiency Over a Wide Power Range”,IEEE Trans. Microwave Theory Tech., vol. 49, No. 12, pp. 2472-2479, (Dec. 2001).
Yang, Y. et al.; “A Fully Matched N-Way Doherty Amplifier With Optimized Linearity”,IEEE Trans. Microwave Theory Tech., vol. 51, No. 3, pp. 986-993, (Mar. 2003).

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