Constant current source circuit

Details Constant current source circuit Constant current source circuit

1983-09-01

1985-02-05

Wong, Peter S.

Electricity: power supply or regulation systems

Self-regulating

Using a three or more terminal semiconductive device as the...

307297, 330288, G05F 320

Patent

active

044980418

ABSTRACT:
A circuit producing a relatively stable constant current during power source voltage fluctuations and driven by a relatively low DC power source voltage, which is includes a power source voltage supply terminal to which is supplied a DC power source voltage, a reference potential terminal, and a current source. A first transistor is connected at its collector to the power source voltage supply terminal via the current source and at its emitter to the reference potential terminal. A current mirror circuit is also used, and a second transistor is connected at its collector to the base of the first transistor via the current mirror circuit and at its emitter to the reference potential terminal. The base of the second transistor is connected to the collector of the first transistor. A third transistor is connected between the power source voltage supply terminal and the reference potential terminal via output terminals to which a load means is connected. The base of the third transistor is connected for being driven by a current proportional to a current of the second transistor.

REFERENCES:
patent: 3922596 (1975-11-01), Cave et al.
patent: 4055774 (1977-10-01), Ahmed
patent: 4297646 (1981-10-01), Locascio et al.
patent: 4308496 (1981-12-01), Nagano
patent: 4361797 (1982-11-01), Kojima et al.
Hart et al., "The Design of Constant Current Sources," Electronic Engineering 85-88, vol. 49, No. 593, (Jun. 1977).
Gray, P. R., and Meyer, R. G., Analysis and Design of Analog Integrated Circuits, 364-365, (1977).

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