Low voltage bandgap reference circuit

In a bandgap voltage reference circuit in accordance with the present invention, the different-sized emitters of the two bipolar devices of a DELTAVBE stage return to ground (or other bias voltage) through separate resistors. The VBE term of the reference device is supplied by a VBE current source t...

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Bibliographic Details
Main Authors FRIEDMAN JAY, OPRIS ION E
Format Patent
LanguageEnglish
Published 30.07.2002
Edition7
Subjects
CONTROLLING
PHYSICS
REGULATING
SYSTEMS FOR REGULATING ELECTRIC OR MAGNETIC VARIABLES
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Summary:In a bandgap voltage reference circuit in accordance with the present invention, the different-sized emitters of the two bipolar devices of a DELTAVBE stage return to ground (or other bias voltage) through separate resistors. The VBE term of the reference device is supplied by a VBE current source through a third resistor. The proportional-to-absolute-temperature (PTAT) term of the reference occurs as the difference of base-emitter voltages DELTAVBE between the larger and smaller emitters. An output voltage Vout multiplier resistor feeds to the larger emitter through an inverting amplifier. In one embodiment of the invention, the output voltage Vout trim at one temperature is obtained by trimming the base-emitter resistor of the "small emitter" device to compensate for the VBE process variation.
Bibliography:Application Number: US20000640897