Amplifier output stage distortion reduction

Details Amplifier output stage distortion reduction Amplifier output stage distortion reduction

1979-07-11

1981-04-21

Dixon, Harold A.

Amplifiers

With semiconductor amplifying device

Including push-pull amplifier

330255, H03F 326, H03F 345

Patent

active

042635632

ABSTRACT:
A high power integrated circuit amplifier employs emitter ballasted NPN output transistors. One output transistor is driven by a PNP transistor to create a composite pair. Since the ballast resistor, in the composite pair, is effectively in the collector of a PNP equivalent transistor, the output stage creates substantial distortion. The output stage is driven by a conventional high gain capacitance compensated amplifier. By connecting an additional negative feedback capacitor between the emitter of the composite pair output transistor and the driver amplifier input, the distortion can be effectively compensated without resorting to power dissipative distortion reduction.

REFERENCES:
patent: 3526846 (1970-09-01), Campbell
patent: 3631357 (1971-12-01), Hadley
patent: 3638130 (1972-01-01), Freeborn
"Designing Transistor AF Power Amplifiers" by Herscher Electronics, (Engineering Edition), Apr. 11, 1968, pp. 96-99.

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