Temperature compensated current source

Details Temperature compensated current source Temperature compensated current source

1988-05-10

1988-11-22

Wong, Peter S.

Electricity: power supply or regulation systems

Self-regulating

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

323907, G05F 326

Patent

active

047868562

ABSTRACT:
A current source provides an output current whose magnitude is substantially independent of changes in temperature. In each of three embodiments (50, 100, 120), one or more bipolar transistors are employed to provide a compensating current which is dependent on the base-to-emitter voltages, V.sub.BE, of such bipolar transistors. The compensating current changes with temperature so as to offset changes in the uncompensated output current so that the total output current is substantially independent of V.sub.BE. The three embodiments employ current mirror circuits (10, 122) that provide a current source of simple circuit design that is operable with the use of a single power supply at a relatively low voltage.

REFERENCES:
patent: 3544882 (1970-12-01), Tanaka
patent: 3886435 (1975-05-01), Steckler
patent: 3922596 (1975-11-01), Cave et al.
patent: 3925718 (1975-12-01), Wittlinger
patent: 3956661 (1976-05-01), Sakamoto et al.
patent: 3973215 (1976-08-01), Ahmed
patent: 4461992 (1984-07-01), Yamaguchi et al.

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