Transistor amplifier

Details Transistor amplifier Transistor amplifier

1974-07-05

1976-03-23

Rolinec, R. V.

Amplifiers

Signal feedback

Combined with control of bias voltage of signal amplifier

330 17, 330 30D, 330 40, H03F 304, H03F 368

Patent

active

039463257

ABSTRACT:
A differential amplifier stage, suitable for use as the first stage in an operational amplifier with a single power supply, has the capability of its input terminals being operated over a range including one of the supply potentials. The differential amplifier stage includes a pair of emitter-coupled transistors of a first conductivity type having their base electrodes connected to input signal terminals. These transistors are each provided with an active collector load by grounded-emitter transistors of the second conductivity type connected collector-to-collector therewith. Commonmode feedback from these collector-to-collector connections to the base electrode of the grounded-emitter transistors is used to regulate the emitter-to-collector potentials of these grounded-emitter transistors to a lower value than their emitter-to-base potentials, but to a value larger enough to avoid saturation.

REFERENCES:
patent: 3564439 (1971-02-01), Rao
patent: 3760288 (1973-09-01), Leonard
patent: R27351 (1972-05-01), McGraw et al.

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