Amplifiers – With semiconductor amplifying device – Including current mirror amplifier
Patent
1983-12-02
1985-11-12
LaRoche, Eugene R.
Amplifiers
With semiconductor amplifying device
Including current mirror amplifier
330257, 330311, H03F 368
Patent
active
045531072
ABSTRACT:
A current mirror circuit having a good input-output current characteristic and operable by a relatively small power supply voltage. The current mirror circuit includes a first resistor connected to a current input circuit, a first transistor whose emitter is connected to the junction of the first resistor and the current input circuit, means for providing a voltage offset, a second resistor connected in series with the base of the first transistor through the voltage offset providing means, a first constant current source connected to the collector of the first transistor, a second constant current source connected to the junction of the base of the first transistor and the voltage offset providing means, and a second transistor whose base is connected to the collector of the first transistor and whose emitter is connected to the junction of the voltage offset providing means and the second resistor to provide a feedback loop. The output current of the current mirror circuit is taken from the collector of the second transistor.
REFERENCES:
patent: 4147992 (1979-04-01), Davis
patent: 4410859 (1983-10-01), Kuwahara
LaRoche Eugene R.
Mottola Steven J.
Tokyo Shibaura Denki Kabushiki Kaisha
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