Power amplifier having protective circuits

Details Power amplifier having protective circuits Power amplifier having protective circuits

1975-02-27

1976-11-02

Mullins, James B.

Amplifiers

Miscellaneous

Amplifier protection means

330 13, 330 29, 330145, H03F 318

Patent

active

039900193

ABSTRACT:
An improved circuit is provided for a known amplifier having complementary input transistors in its power output stages for supplying oppositely phased signals in response to an input signal. Output transistors are connected to the input transistors to provide output signals for the amplifier. Normally conducting switching means are connected between one of the output transistors and one of the input transistors. Normally nonconducting switching means are coupled between the one output transistor and the amplifier input. During an overload or overdrive condition, the normally conducting switching means become nonconducting, and this in turn causes the normally nonconducting switching means to become conducting, and thereby limit the output from the amplifier. The improved circuit for the amplifier includes a threshold device which responds to the normally conducting switching means becoming nonconducting and reduces the input signal amplitude, and thereby permits the amplifier to restore itself when the overload or overdrive condition is removed.

REFERENCES:
patent: 3596199 (1971-07-01), Hafler

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