Power amplifier having improved power supply circuit

Details Power amplifier having improved power supply circuit Power amplifier having improved power supply circuit

1983-01-19

1985-05-28

Mullins, James B.

Amplifiers

With semiconductor amplifying device

Including push-pull amplifier

330297, H03F 330

Patent

active

045203229

ABSTRACT:
A power amplifier, suitable for use as an audio amplifier, having an improved power supply circuit in which distortion caused by switching between power supply levels is substantially eliminated. Transistors of a push-pull amplifier stage are selectively couplable to either first or second supplies, with the output voltages of the second supplies exceeding those of the first supplies. In ordinary operation, switching of the output transistors between the first and second supplies is done in accordance with an absolute magnitude of the output signal from the amplifier. However, when the magnitude of high frequency components in the output signal exceeds a certain level, the output transistors of the push-pull stage are supplied power only from the first supplies.

REFERENCES:
patent: 4329657 (1982-05-01), Kamiya

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