Amplifiers – With semiconductor amplifying device – Including differential amplifier
Patent
1985-12-24
1987-03-31
Mullins, James B.
Amplifiers
With semiconductor amplifying device
Including differential amplifier
330288, 323315, H03F 345
Patent
active
046546022
ABSTRACT:
A current mirror circuit suitable for a wide range input current and low voltage integrated circuit. The current mirror circuit comprises; a power supply source, a circuit ground, a reference voltage source; first and second transistors of a first conductivity type, which have their collectors, their bases connected together and their emitters connected to the power supply source, an input current supplying transistor connected in series to the collector-emitter path of the first transistor, an output current deriving circuit connected in series to the collector-emitter path of the second transistor, a third transistor of a second conductivity type complementary to the first conductivity type, which has its collector connected to the power supply source, its base connected to the collector of the first transistor and its emitter, a fourth transistor of the second conductivity type, which has its collector connected to the bases of the first and second transistors, its base connected to the reference voltage source and its emitter connected to the emitter of the third transistor, and a current source transistor connected between the emitter of the third and fourth transistors and the circuit ground, which is connected to the input current supplying transistor so as to be controlled by the input current supplying transistor.
REFERENCES:
patent: 4092611 (1978-05-01), Frederiksen et al.
Kabushiki Kaisha Toshiba
Mullins James B.
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