Amplifiers – With semiconductor amplifying device – Including particular biasing arrangement
Reexamination Certificate
2005-09-20
2005-09-20
Tokar, Michael (Department: 2819)
Amplifiers
With semiconductor amplifying device
Including particular biasing arrangement
C330S285000
Reexamination Certificate
active
06946913
ABSTRACT:
A high-frequency amplifier has an amplifying transistor and a bias circuit that supplies a bias current to the base of the amplifier transistor. The bias circuit has a reference voltage input terminal to which a reference voltage is input from an external source, a first transistor that supplies a bias current to the base of the amplifier transistor in response to the reference voltage, a second transistor whose collector is connected to the connecting point of the first transistor to the base of the amplifying transistor, and whose emitter is grounded, a third transistor that supplies a bias current to the base of the second transistor in response to the reference voltage, and temperature compensation portions connected between the connecting point of the control input terminal to the third transistor and the grounding point.
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Maemura Kosei
Moriwaki Takao
Yamamoto Yuji
Leydig , Voit & Mayer, Ltd.
Mitsubishi Denki & Kabushiki Kaisha
Nguyen Linh V
Tokar Michael
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