Multi stage circuits for providing a bandgap voltage reference less dependent on or independent of a resistor ratio
A bandgap voltage reference uses multiple PTAT voltage reference circuits (also called PTAT sources) coupled in series to generate a final PTAT voltage. A current-biased base-emitter region of a bipolar transistor is coupled between the final PTAT voltage and an output terminal of the bandgap voltag...
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Zusammenfassung: | A bandgap voltage reference uses multiple PTAT voltage reference circuits (also called PTAT sources) coupled in series to generate a final PTAT voltage. A current-biased base-emitter region of a bipolar transistor is coupled between the final PTAT voltage and an output terminal of the bandgap voltage reference so as to add the base-emitter voltage to the final PTAT voltage to thereby generate a stable bandgap voltage reference. By using multiple PTAT voltage reference in series, the need for a resistor ratio is reduced (or even eliminated) thereby reducing the size of the resistors that generate the resistor ratio (or eliminate the need for the resistors entirely). |
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