Amplifiers – With semiconductor amplifying device – Including differential amplifier
Patent
1991-10-18
1994-04-19
Mullins, James B.
Amplifiers
With semiconductor amplifying device
Including differential amplifier
330283, 330311, 348707, H03G 314
Patent
active
053049462
ABSTRACT:
An amplifier circuit includes a grounded-collector circuit for converting an input signal voltage into a first signal current, a second transistor circuit for transmitting the first signal current to an output side, a variable impedance for converting the first signal current transmitted to the output side into a voltage, and a circuit block having a voltage generation circuit connected in series to the variable impedance. A transistor constituting the grounded-collector circuit has a collector connected to a junction of the voltage generation circuit and the variable impedance and an emitter connected to an input side of the second transistor. The amplifier circuit has an operation point in which input and output voltages are maintained constant even if a gain is varied.
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Ohsawa Michitaka
Sano Yuji
Hitachi , Ltd.
Mullins James B.
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