Temperature compensation bandgap voltage reference and method
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United States of America Patent
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Oct 4, 1994
Grant Date -
N/A
app pub date -
Jan 13, 1993
filing date -
Jan 13, 1993
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Abstract
An output curvature correction is provided for a band-gap reference circuit that exhibits a temperature dependent output error in the form of k.sub.1 T - k.sub.2 Tln(k.sub.3 T) in the absence of the correction. A substantially constant collector current is driven through a correction transistor and used in connection with a proportional to absolute temperature (PTAT) transistor collector current in the uncorrected circuit. The difference between the base-emitter voltages for the two transistors has the form -k.sub.1 'T + k.sub.2 'ln(k.sub.3 'T.sub.). This voltage differential is scaled by an appropriate selection of resistor ratios and combined with the uncorrected circuit output to provide a corrected output that is substantially insensitive to temperature variations.
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