Constant current source circuit

Details Constant current source circuit Constant current source circuit

1989-12-06

1991-10-22

Stephan, Steven L.

Electricity: power supply or regulation systems

Self-regulating

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

3072961, G05F 326

Patent

active

050598902

ABSTRACT:
A constant current source circuit includes a current mirror circuit supplying a load circuit with an output current which is regulated on the basis of a reference current, a transistor having an emitter, a collector connected to a first power source line, and a base coupled to the current mirror circuit, and a resistor coupled between the emitter and base. The reference current passes through the resistor. A current control circuit controls a current directed to a second power source line in accordance with a bias voltage. The above current consists of the reference current and a collector current passing through the transistor. A bias circuit having a current path derives the bias voltage from a current passing from the first power source line to the second power source line through the current path.

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