Perfectly curvature corrected bandgap reference
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United States of America Patent
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Issued Date -
Mar 8, 2007
app pub date -
Sep 2, 2005
filing date -
Sep 2, 2005
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
In one embodiment, a bandgap voltage reference generating circuit is configured to generate a reference voltage, and may comprise a first PN-junction whose base-emitter voltage (V.sub.BE) exhibits a curvature with respect to temperature, where a current conducted by the first PN-junction is proportional to absolute temperature (PTAT). The voltage reference generating circuit may also include a second PN-junction coupled to the first PN-junction. A control circuit coupled to the second PN-junction may be configured to inject a control current into the second PN-junction, where the control current has a negative to absolute temperature (NTAT) characteristic, the control circuit thereby operating to effectively eliminate a curvature with respect to temperature exhibited by the bandgap voltage.
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