Audio-frequency power amplifiers

Details Audio-frequency power amplifiers Audio-frequency power amplifiers

1977-03-16

1978-01-10

Dahl, Lawrence J.

Amplifiers

With semiconductor amplifying device

Including push-pull amplifier

330255, H03F 326

Patent

active

040681874

ABSTRACT:
An audio- or low-frequency power amplifier comprises a pair of output transistors which are opposite in a conduction type to each other and connected in a complementary push-pull circuit configuration in which an impedance element is connected between the bases of the paired output transistors whose bases are adapted to be applied with an input signal while the output signal of the amplifier is derived from the coupled emitters of the output transistors. The amplifier further includes a current stabilizer transistor having a base-emitter junction across which a fixed bias voltage is applied and a collector, the current from which is supplied to the impedance element thereby to provide a bias voltage for the paired output transistors. A first resistor is connected between the emitter of the current stabilizer transistor and one electrode or pole of a first d.c. power source while a second resistor is connected between the emitter of the current stabilizer transistor and the other pole of the d.c. source, thereby to maintain constant the bias voltages applied to the paired output transistors.

REFERENCES:
patent: 3376388 (1968-04-01), Reiffin
patent: 3883813 (1975-05-01), Sekiya

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