Amplifiers – With semiconductor amplifying device – Including particular biasing arrangement
Patent
1980-09-19
1984-02-21
Mullins, James B.
Amplifiers
With semiconductor amplifying device
Including particular biasing arrangement
330288, 330310, H03F 304
Patent
active
044333056
ABSTRACT:
A push-pull amplifier circuit using bipolar transistors in which non-linear distortion caused by the base-emitter voltages of the amplifying transistors of the circuit is eliminated without the use of negative AC feedback and in which variations in a DC output level at the output terminal of the amplifier are detected and fed back to the input side of the amplifier whereby the stability of the circuit at very low frequencies is remarkably improved. A first amplifier stage includes a first transistor having a base to which an input signal is applied and a second transistor the base of which is coupled to an output of the first transistor with the second transistor being of the opposite conductivity type to the first transistor. A current mirror circuit supplies currents to the first and second transistors with the currents thus supplied having a constant ratio. A second amplifying stage is provided having the same construction. A load is coupled to be driven by the current flowing through the first transistor in the first amplifying stage and by the corresponding transistor in the second amplifying stage. Variations in the output of the circuit are detected to provide a DC feedback voltage which is coupled back to emitter circuits in the input stages of the amplifier.
REFERENCES:
patent: 4103248 (1978-07-01), Idei
Andrew McClellan, "Current Source and 555 Timer Make Linear V-to-f Converter," Electronics, Jun. 10, 1976, pp. 108-109.
Ishii Satoshi
Ishikawa Kikuo
Ozawa Akio
Sato Keishi
Sueyoshi Susumu
Mullins James B.
Pioneer Electronic Corporation
Wan Gene
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