Low voltage bandgap reference circuit
1. Field of the Invention In a bandgap voltage reference circuit in accordance with the present invention, the different-sized emitters of the two bipolar devices of a Vstage return to ground (or other bias voltage) through separate resistors. The Vterm of the reference device is supplied by a Vcurr...
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| Main Authors | , |
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| Format | Patent |
| Language | English |
| Published |
30.07.2002
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| Online Access | Get full text |
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| Summary: | 1. Field of the Invention
In a bandgap voltage reference circuit in accordance with the present invention, the different-sized emitters of the two bipolar devices of a Vstage return to ground (or other bias voltage) through separate resistors. The Vterm of the reference device is supplied by a Vcurrent source through a third resistor. The proportional-to-absolute-temperature (PTAT) term of the reference occurs as the difference of base-emitter voltages Vbetween the larger and smaller emitters. An output voltage Vmultiplier resistor feeds to the larger emitter through an inverting amplifier. In one embodiment of the invention, the output voltage Vtrim at one temperature is obtained by trimming the base-emitter resistor of the "small emitter" device to compensate for the Vprocess variation. |
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