Patent ID: 6614209
Filing Date: 2003-09-02
Classification: G05F

Abstract:
A bandgap voltage reference circuit having at least two output terminals, the bandgap voltage reference circuit configured to apply a bandgap voltage between the two output terminals during operation, the bandgap voltage reference circuit comprising the following:an initial Proportional To Absolute Temperature (PTAT) source having two output terminals, the initial PTAT source configured to generate an initial voltage across the two output terminals of the initial PTAT source, the initial voltage containing an initial PTAT voltage as well as potentially a non-PTAT voltage component; one or more subsequent PTAT sources coupled in series with the initial PTAT source to complete a series of PTAT sources beginning with the initial PTAT source and ending at a terminating PTAT source of the one or more subsequent PTAT sources, the one or more subsequent PTAT sources configured to add a supplemental PTAT voltage to the initial PTAT voltage and configured to substantially offset any non-PTAT voltage component present in the initial voltage to generate a final PTAT voltage between two output terminals of the terminating PTAT source; and a forward biased PN junction coupled in series between one of the two output terminals of the terminating PTAT source and one of the two output terminals of the bandgap voltage reference circuit.