Reference voltage generating circuit

Details Reference voltage generating circuit Reference voltage generating circuit

1990-07-10

1991-10-29

Heyman, John S.

Electrical transmission or interconnection systems

Nonlinear reactor systems

Parametrons

3072965, 3072966, 307491, 307496, 323312, 323316, H03K 301, G06G 712, G05F 304, G05F 316

Patent

active

050618628

ABSTRACT:
A reference voltage generating circuit of the invention includes a differential amplifier having a pair of transistors of one conductivity type as differential input transistors; an operational amplifier having a pair of transistors of a conductivity type opposite to the one conductivity type as differential input transistors; and a feedback circuit constituted by a plurality of resistors, a first plurality of diodes connected in series and a second plurality of diodes connected in series. By the appropriate selection of the resistance value of each of the resistors, the temperature coefficient of the ouptut voltage can be made zero. The circuit of the invention does not require a start-up resistor which requires a considerably large chip area. The resultant reference voltage with respect to the ground potential or power supply potential outputted from the operational amplifier has no dependency on the variations or changes in the power supply voltage or in temperature.

REFERENCES:
patent: 4507572 (1985-03-01), Hashimoto et al.
patent: 4931718 (1990-06-01), Zitta
Widlar, Robert J., "New Developments in IC Voltage Regulators", Feb. 1971, IEEE Journal of Solid State Circuits, vol. SC-6, No. 1.
Kuijk, Karel E., "A Precision Reference Voltage Source" Jun. 1973, IEEE Journal of Solid State Circuits, vol. SC-8, No. 3.

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