Biasing and drive circuitry for quasi-linear transistor amplifie

Details Biasing and drive circuitry for quasi-linear transistor amplifie Biasing and drive circuitry for quasi-linear transistor amplifie

1978-06-05

1979-12-25

Mullins, James B.

Amplifiers

With semiconductor amplifying device

Including push-pull amplifier

330255, 330289, H03F 326

Patent

active

041807812

ABSTRACT:
An output transistor in common-emitter amplifier configuration is thermally coupled to means for generating a temperature-compensated component of bias potential. This bias potential is indirectly applied to the base electrode of the output transistor to provide for temperature-stabilized idling current flow in its collector-to-emitter path. More particularly, the bias potential is applied to the non-inverting terminal of a high-gain differential-input amplifier having its output terminal direct coupled to the base of the transistor and direct coupled to its inverting input terminal for regulating the quiescent potential at its output terminal to equal the bias potential. The differential-input amplifier has an input signal applied to one of its input terminals. In response to signal excursions in one sense, the differential-input amplifier drives the output transistor into increased conduction. Arrangements of two output transistors and respective differential-input amplifiers for push-pull operation are described.

REFERENCES:
patent: 2951208 (1960-08-01), Barton
patent: 3967207 (1976-06-01), Wheatley
Smith, Modern Operational Amplifier Design, pp. 2,26, copyright 1971, John Wiley & Sons, Inc., New York, London Sydney, Toronto.
Glogolja, "Biasing Circuit for the Output Stage of a Power Amplifier-The V.sub.BE Multiplier," RCA Application Note AN-6297, May 1974.

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