Current amplifier

Details Current amplifier Current amplifier

1974-08-16

1977-02-15

Rolinec, Rudolph V.

Amplifiers

Signal feedback

Combined with control of bias voltage of signal amplifier

323 4, 330 19, 330 22, 330 28, H03F 316

Patent

active

040084418

ABSTRACT:
Current mirror amplifiers, each using a field-effect transistor as a source follower to provide collector-to-base feedback to a first bipolar transistor to condition its collector-to-emitter path to accept an input current. A second bipolar transistor has its base-emitter circuit parallelled with base-emitter circuit of the first bipolar transistor which conditions the collector-to-emitter path of the second bipolar transistor to conduct an output current proportionally related to that in the collector-to-emitter path of the first bipolar transistor. Since the source follower supplies the base currents of the bipolar transistors without requiring any gate current, the ratio of the input to output currents is constant regardless of the current gain of the bipolar transistors.

REFERENCES:
patent: 3710271 (1973-01-01), Putman
patent: 3813607 (1974-05-01), Voorman
patent: 3843933 (1974-10-01), Ahmed
patent: 3870965 (1975-03-01), Frederiksen

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