Amplifiers – With semiconductor amplifying device – Including push-pull amplifier
Patent
1979-10-16
1982-02-23
Mullins, James B.
Amplifiers
With semiconductor amplifying device
Including push-pull amplifier
307300, H03F 330
Patent
active
043170811
ABSTRACT:
A power amplifier has first and second, complementary power transistors with their emitter-collector paths connected in series between power supply terminals. An input signal applied to bases of these transistors operates them in a complementary manner. First and second current-voltage converters have their ends connected respectively to the respective bases of the first and second transistors. An additional two transistors have their respective bases connected to the other ends of the first and second current-voltage converters. A time constant required for the charge carrier stored in the first and second transistors to discharge is determined by the product of the base-collector capacitances of the first and second transistors multiplied by the dynamic resistances, upon conduction, of the collector-emitter path of the additional transistors. Since the additional transistors are conducting when the stored charge carriers discharge, the dynamic resistances of their collector-emitter paths are very low, and the time constant for the stored carriers to discharge becomes very small. In other words, since the stored carriers can be discharged quickly through the additional transistors, the disadvantages in the prior art (such as poor fidelity in the high-frequency range generation of a D.C. component in the output, and an abnormal current) can be eliminated.
REFERENCES:
patent: 3831102 (1974-08-01), Medal
Mullins James B.
Nippon Electric Co. Ltd.
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