High-frequency power amplifier

Details High-frequency power amplifier High-frequency power amplifier

2008-05-06

2008-05-06

Nguyen, Khanh Van (Department: 2817)

Amplifiers

With control of power supply or bias voltage

With control of input electrode or gain control electrode bias

C330S285000

Reexamination Certificate

active

07368988

ABSTRACT:
In a base-bias-control-type high-frequency power amplifier with a plural stage configuration, a rising voltage of a base bias current supplied to an initial stage transistor is made lower than a rising voltage of a base bias current supplied to a second stage transistor by a bias circuit, and a difference between the both voltages is set to be smaller than a base-emitter voltage of an amplifying stage transistor. Also, a rising voltage of a base bias current supplied to a third stage transistor is made equal to the rising voltage of the base bias current supplied to an initial stage transistor. Accordingly, a technology capable of improving the power control linearity can be provided in a high-frequency power amplifier used in a polar-loop transmitter or the like.

REFERENCES:
patent: 6236266 (2001-05-01), Choumei et al.
patent: 6701138 (2004-03-01), Epperson et al.
patent: 7038546 (2006-05-01), Kuriyama
patent: 7049892 (2006-05-01), Matsunaga et al.
patent: 2000-332542 (2000-11-01), None
patent: 2004-40418 (2004-02-01), None

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