Bias circuit which is independent of output device voltage chara

Details Bias circuit which is independent of output device voltage chara Bias circuit which is independent of output device voltage chara

1982-11-18

1985-01-01

Mullins, James B.

Amplifiers

With semiconductor amplifying device

Including push-pull amplifier

330268, 330270, H03F 330

Patent

active

044918046

ABSTRACT:
A Class AB amplifier circuit includes bias circuitry for biasing the output transistor into partial conduction independent of the base-to-emitter voltage of the transistor. The bias circuitry is a simple circuit loop including the output transistor and forms the remainder of the amplifier circuit which can be fabricated in monolithic integrated circuit form. The loop comprises a differential amplifier for providing a substantially constant offset voltage across a pair of terminals between which is connected a current biasing component. The current biasing component is connected in series with the output transistor to produce a small quiescent current to flow therethrough, the value of which is independent of the transistor's characteristics.

REFERENCES:
patent: 4356452 (1982-10-01), Iwamatsu
Cole, "Class B Amplifier", IBM Technical Disclosure Bulletin, vol. 16, No. 11, Apr. 1974, pp. 3760, 3761.

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