Monolithic current supplies having high output impedances

Details Monolithic current supplies having high output impedances Monolithic current supplies having high output impedances

1978-03-09

1979-12-04

Pellinen, A. D.

Electricity: power supply or regulation systems

Remote sensing

G05F 156

Patent

active

041774167

ABSTRACT:
The current supply includes a constant current supply transistor which is cascoded with an output transistor. The current supply also has a feedback circuit including two current mirrors connected between the base and emitter electrodes of the output transistor. The feedback circuit and the output transistor clamps the potential at the collector electrode of the current supply transistor to a constant magnitude to substantially eliminate base width modulation therein. Also, the feedback circuit provides a current into the emitter of the output transistor having an instantaneous magnitude substantially equal to the magnitude of the base current flowing out of the base electrode of the output transistor. Consequently, the collector current of the output transistor remains substantially constant even though the variation of the magnitude of the load voltage at the output terminal of the current supply circuit causes the magnitude of the base current of the output transistor to change.

REFERENCES:
patent: 3721893 (1973-03-01), Davis
patent: 3942129 (1976-03-01), Hall
patent: 4092612 (1978-05-01), Schade

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