Amplifier with over-current protection

Details Amplifier with over-current protection Amplifier with over-current protection

1975-02-27

1976-06-29

Mullins, James B.

Amplifiers

Signal feedback

Combined with control of bias voltage of signal amplifier

307202R, 330207P, H03F 304

Patent

active

039672077

ABSTRACT:
PNP composite transistors connected as commonemitter amplifiers each comprise a PNP pre-amplifier transistor in direct coupled cascade with a plurality of parallelled NPN transistors. The emitter-electrode of the PNP transistor is connected to a sensing resistor in the collector path of one of these NPN transistors, causing the "base-to-emitter" potential of the composite transistor to increase if its "emitter" current exceeds a threshold current. By clamping this base-to-emitter potential if it exceeds a predetermined potential, the output current of the composite transistor is prevented from becoming excessive. This predetermined potential is controlled as a function of composite transistor temperature and supply potential to provide the required degree of over-current protection for these particular conditions.

REFERENCES:
patent: 3512097 (1970-05-01), Tyler
patent: 3531730 (1970-09-01), Steckler
patent: 3701004 (1972-10-01), Tuccinardi et al.
patent: 3754182 (1973-08-01), Morris et al.
Electronics World-June 1960, pp. 44, 45, "IC Op-Amp Hi-Fi Preamplifier by Recklinghausen."

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