Amplifiers – With semiconductor amplifying device – Including balanced to unbalanced circuits and vice versa
Reexamination Certificate
2008-05-06
2008-05-06
Mottola, Steven J. (Department: 2817)
Amplifiers
With semiconductor amplifying device
Including balanced to unbalanced circuits and vice versa
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
Kuriyama Akira
Matsumoto Hidetoshi
Ohnishi Masami
Tanoue Tomonori
Miles & Stockbridge P.C.
Mottola Steven J.
Renesas Technology Corp.
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