Low current voltage reference

Details Low current voltage reference Low current voltage reference

1989-09-13

1990-02-06

Tarcza, Thomas H.

Electricity: power supply or regulation systems

Self-regulating

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

3072961, G05F 316

Patent

active

H00007439

ABSTRACT:
A voltage reference circuit for use with a low-voltage detector or like circuit includes a voltage source, a proportional-to-absolute-temperature circuit connected to said voltage source. The proportional-to-absolute-temperature circuit has a positive temperature coefficient and produces a reference voltage that is substantially independent of the source voltage. A diode having a large negative temperature coefficient is connected in series with the proportional-to-absolute-temperature circuit. The negative temperature coefficient characteristics of the diode are chosen so as to completely offset the positive temperature coefficient of the proportional to absolute temperature circuit. As such the voltage reference has a value which is substantially independent of temperature and the voltage source. The proportional-to-absolute-temperature circuit and the diode combination draw only a small current from said voltage source. Also provided is a start-up circuit in the form of a capacitor transistor network for generating small currents in the voltage reference circuit during start-up when the source voltage is connected to the circuit.

REFERENCES:
patent: 2951208 (1953-07-01), Barton
patent: 3522548 (1968-05-01), Heuner et al.
Vittoz et al, "A Low-Voltage CMOS Bandgap Reference", IEEE Journal of SolState Circuits, vol. SC-14, No. 3, Jun. 1979.

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