High frequency power amplifier

Amplifiers – With semiconductor amplifying device – Including balanced to unbalanced circuits and vice versa

Reexamination Certificate

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Details

C330S302000

Reexamination Certificate

active

07368996

ABSTRACT:
Disclosed is a power amplifier having highly stable and excellent controllability, and having low noise in comparison with conventional power amplifiers. With the power amplifier, a differential amplifier made up of transistors Q1, Q2is provided in the initial stage thereof, and baluns doubling as inter-stage matching circuits, comprised of Cp1, Cp2, Lp1, and Ct1, Ct2, Lt1, respectively, are provided between the initial stage, and a second stage while an unbalanced single-ended circuit is provided in the second stage. The differential amplifier has an emitter-coupled type configuration for coupling both emitters with each other, and output control of the amplifier in the initial stage is executed by varying current of a current source coupled to both the emitters.

REFERENCES:
patent: 4945317 (1990-07-01), Sato et al.
patent: 6420937 (2002-07-01), Akatsuka et al.
patent: 6937097 (2005-08-01), Joo et al.
patent: 2002-076954 (2002-03-01), None
patent: 2002-164797 (2002-06-01), None

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