Temperature compensated current source

Details Temperature compensated current source Temperature compensated current source

1979-02-15

1980-12-16

Beha, Jr., William H.

Electricity: power supply or regulation systems

Remote sensing

G05F 320

Patent

active

042400244

ABSTRACT:
An integrated current source comprising a discrete resistor having one side thereof electrically connected through a PNP transistor to a first DC supply voltage and through series connected base-emitter diodes of a first pair of NPN transistors to a temperature stable DC supply voltage. The other side of the resistor is electrically connected to ground through series connected base-emitter junctions of a second pair of NPN transistors, with the base emitter junctions of the first and second transistor pairs being poled in opposite directions. The NPN transistors are caused to have collector currents that make the base-emitter junction voltages cancel on opposite sides of the resistor. This causes the temperature stable supply voltage to be established across the resistor in order to set a reference current in it, and in an NPN transistor driving the load, that is substantially constant and independent of temperature.

REFERENCES:
patent: 3617859 (1971-11-01), Dobkin
patent: 3760200 (1973-09-01), Taniguchi et al.
patent: 4004247 (1977-01-01), Van de Plassche
patent: 4088941 (1978-05-01), Wheatley
101 Analog IC Designs, Interdesign, Inc., 1976, p. 32. _

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