Precision thermal current source

Details Precision thermal current source Precision thermal current source

1986-10-06

1987-06-30

Beha, Jr., William H.

Electricity: power supply or regulation systems

Self-regulating

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

323313, 323315, 323907, 330256, G05F 330

Patent

active

046773681

ABSTRACT:
A circuit that develops a current having a predetermined temperature coefficient includes a pair of transistors which are supplied equal collector currents but which are operated at different current densities to produce a difference voltage between the emitters thereof that has a predetermined temperature coefficient. A third transistor is biased to sink a collector current the value of which is set by the ratio of the difference voltage to the value of a first resistor which is coupled between the collector and base of the third transistor. A second resistor can be coupled between the base and emitter of the third transistor to an output of the circuit whereby the current flowing from the output has a net temperature coefficient that is determined by the ratio of the value of the first resistor to the value of the second resistor.

REFERENCES:
patent: 4157493 (1979-06-01), Monticelli
patent: 4460865 (1984-07-01), Bynum et al.
patent: 4603290 (1986-07-01), Shinomiya

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