Power amplifier including an impedance matching circuit and a sw

Details Power amplifier including an impedance matching circuit and a sw Power amplifier including an impedance matching circuit and a sw

1995-05-10

1996-08-20

Mottola, Steven

Amplifiers

Combined with automatic amplifier disabling switch means

330277, 330295, 330302, H03F 114, H03F 316, H03F 368, H03F 3191

Patent

active

055482465

ABSTRACT:
A power amplifier comprises opposite input and output terminals, a first amplifier circuit connected between the input terminal and the output terminal and comprising a first amplifier FET and a first matching circuit, and a second amplifier circuit connected between the input terminal and the output terminal and comprising a second amplifier FET, a second matching circuit, and a switching circuit. In this power amplifier, the first amplifier circuit outputs an output signal of a first power level when the first amplifier FET is operated while the second amplifier FET is not operated and the switching circuit is turned off, and the second amplifier circuit outputs an output signal of a second power level when the first amplifier FET is not operated while the second amplifier FET is operated and the switching circuit is turned on. Therefore, impedances of the output side matching circuits of the first and second amplifier circuits which output amplified signals of different power levels can be optimized with high precision. As the result, in both the high-power output operation and the low-power output operation, the efficiencies of the first and second amplifier circuits are significantly improved.

REFERENCES:
patent: 4598252 (1986-07-01), Andricos
Muraguchi et al, "A UHF-Band High-Efficiency Variable Gain Power Amplifier", Society of Electronic Information Communication, Autumn Meeting, 1993, pp. 2-402.

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