Temperature compensated constant current source

Details Temperature compensated constant current source Temperature compensated constant current source

G - Physics

05

F

G05F 1/567 (2006.01)

Patent

CA 2298929

The invention includes a temperature compensated constant current source. Specifically, two PNP transistors are implemented in a circuit wherein one of the transistors is used to provide a DC feedback to the other transistor to stabilize the output current. Temperature independence is effected due to the base emitter saturation voltage occurring when the emitter resistance is equal to the collector resistance at large values for .beta., the common emitter current gain. The circuit provides a stable constant current source independent of temperature variations.

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