High frequency power amplifier circuit device

Details High frequency power amplifier circuit device High frequency power amplifier circuit device

2006-05-23

2006-05-23

Mottola, Steven J. (Department: 2817)

Amplifiers

With semiconductor amplifying device

Including gain control means

C330S133000

Reexamination Certificate

active

07049892

ABSTRACT:
A multistage high frequency power amplifier circuit device has a plurality of semiconductor amplification elements connected in a cascade. The circuit device is provided with a bias control circuit used to control the bias voltage or bias current of the output semiconductor amplification element in each stage so as to reduce the variation of the output power with respect to the power control signal voltage in an area around the threshold voltage of the semiconductor amplification elements. This realizes a high frequency power amplifier circuit device provided with excellent controllability of the output power and high efficiency at the time of low power output realized with use of such a control voltage as a power control signal.

REFERENCES:
patent: 5994963 (1999-11-01), Kawai et al.
patent: 6172567 (2001-01-01), Ueno et al.
patent: 6333675 (2001-12-01), Saito
patent: 6605999 (2003-08-01), Matsushita et al.
patent: 6636114 (2003-10-01), Tsutsui et al.
patent: 6771128 (2004-08-01), Yamashita et al.
patent: 2003/0001677 (2003-01-01), Taniguchi et al.
patent: 11-275465 (1999-10-01), None

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