Push-pull amplifier

Details Push-pull amplifier Push-pull amplifier

1979-07-17

1981-12-15

Mullins, James B.

Amplifiers

With semiconductor amplifying device

Including push-pull amplifier

330274, H03F 330

Patent

active

043061990

ABSTRACT:
A push-pull amplifier comprises first and second output circuits each comprising at least one transistor which circuits are mutually connected in push-pull configuration, first and second detection circuits for respectively detecting the differences between the input and output voltages of the first and second output circuits, and first and second variable bias circuits operating in response to the detection outputs of the first and second detection circuits, respectively, to apply constant bias voltages to the transistors of the first and second output circuits in the case where the absolute values of the output currents of the first and second output circuits are below a specific level and to apply, as bias voltages, voltages equal to the sums of the constant bias voltages and voltages corresponding to the detection outputs of the first and second detection circuits to the first and second output circuits in the case where the absolute values of the output currents are above a specific level. The transistors of the first and second output circuits continually operate in their active areas.

REFERENCES:
patent: 3995228 (1976-11-01), Pass

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