Temperature compensated current switch

Details Temperature compensated current switch Temperature compensated current switch

1985-03-29

1986-07-22

Wong, Peter S.

Electricity: power supply or regulation systems

Self-regulating

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

323907, 330289, G05F 320

Patent

active

046022082

ABSTRACT:
A current switch whose turn-on and turn-off voltages are independent of temperature includes a transistor switch circuit having two input transistors to which a differential voltage is applied, two sensing transistors for sensing turn-on and turn-off voltages respectively, and an output transistor controlled by the sensing transistors. A differential voltage sensing circuit including a differential transistor pair is connected to receive the differential voltage at the inputs of the transistors and to deliver the differential voltage to the transistor switch circuit. A biasing current source is provided to supply biasing currents which vary as a function of temperature to the input and sensing transistors of the switch circuit, and a biasing current source is provided to supply a biasing current which varies as a function of temperature squared to the differential transistor pair.

REFERENCES:
patent: 4400635 (1983-08-01), Mazgy
patent: 4446419 (1984-05-01), van de Plassche et al.
patent: 4506176 (1985-03-01), Harris
patent: 4524292 (1985-06-01), Nagano
patent: 4528516 (1985-07-01), Hill
Gilbert, Barrie, "Translinear Circuits", May, 1981.

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