Bandgap voltage reference employing sub-surface current using a

Details Bandgap voltage reference employing sub-surface current using a Bandgap voltage reference employing sub-surface current using a

1980-02-07

1982-02-23

Anagnos, Larry N.

Electrical transmission or interconnection systems

Nonlinear reactor systems

Parametrons

323313, 307355, G05F 156

Patent

active

043170544

ABSTRACT:
A bandgap voltage reference employing only subsurface currents wich may be fabricated using a standard CMOS process. The reference includes first and second vertical bipolar transistors having common collectors formed in an integrated circuit substrate. A first resistor connects the emitter of the first transistor to ground potential. A second resistor connects the emitter of the second transistor to a reference node while a third resistor connects the reference node to ground. A differential amplifier has a positive input connected to the reference node, a negative input connected to the first transistor emitter and an output connected to the bases of the first and second transistors and also providing the reference voltage output. In a preferred form the output of the differential amplifier is buffered by a third transistor and coupled by a resistive divider to the first and second transistor bases so that the reference voltage may be selected at any scalar of the basic bandgap voltage.

REFERENCES:
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patent: 4059793 (1977-11-01), Ahmed
patent: 4064448 (1977-12-01), Eatock
patent: 4087758 (1978-05-01), Hareyama
patent: 4146903 (1979-03-01), Dobkin
patent: 4191900 (1980-03-01), Redfern et al.
Gilbert, "Wideband Negative-Current Mirror"; Electronic Letters; vol. 11, No. 6, pp. 126-127, 3/20/1975.
Widlar, "New Developments in IC Voltage Regulators"; IEEE-JSSC; vol. SC-6, pp. 2-7, 2/1971.
Kuijk, "A Precision Reference Voltage Source"; IEEE-JSSC; vol. SC-8, pp. 222-226, 6/1973.
Brokaw, "A Simple Three Terminal IC Bandgap Reference"; IEEE-JSSC; vol. SC-9, pp. 388-393, 12/1974.
Vittoz et al., "A Low Voltage CMOS Bandgap Reference"; IEEE-JSSC; vol. SC-14, pp. 573-577, 6/1979.
Tzanateas et al., "A CMOS Bandgap Reference"; IEEE-JSSC; vol. SC-14, pp. 655-657, 6/1979.

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