Direct-coupled FET amplifier

Amplifiers – Signal feedback – Combined with control of bias voltage of signal amplifier

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330 15, 330 17, 330 19, 330 30D, H03F 316

Patent

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039873692

ABSTRACT:
A direct-coupled full stage cascaded amplifier comprising an output stage, a drive stage and a predrive stage. The output stage is composed of an SEPP (single-ended push-pull) circuit of a plurality of FET's having a certain conductivity type channel. The drive stage is composed of a differential amplifier circuit of a plurality of FET's having a channel of a conductivity type same as that of the FET's in the output stage. The pre-drive stage is composed of another differential amplifier circuit of a plurality of FET's having a channel of a conductivity type opposite to that of the FET's in the output stage. The source electrodes of the FET's in the respective differential amplifier circuits are connected via constant current circuits, respectively, to voltage supply lines having opposite polarities.

REFERENCES:
patent: 3092783 (1963-06-01), Krohn
patent: 3538447 (1970-11-01), Johnson
patent: 3723896 (1973-03-01), Flickinger
dahlem, "Industrial Applications of Linear ICs", The Electronic Engineer, June 1967, pp. 72-77.

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