Band-gap reference circuit for providing an accurate reference voltage compensated for process state, process variations and temperature
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United States of America Patent
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Aug 19, 2003
Grant Date -
N/A
app pub date -
Sep 26, 2001
filing date -
Oct 26, 2000
priority date (Note) -
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Abstract
The present invention relates to a band-gap reference circuit. The circuit comprises a plurality of diodes connected in series in one or more chains, a current source to flow current through the diode chains, and a selection of shunt current sources. The shunt current sources are connected in parallel with the main current sources and each, or any, can be selected in order to add current to the diode chain. In this manner, current flow through the diode chain is adjusted in order to provide a trimmable band-gap reference voltage. By adjusting the current flow, the high precision reference voltage circuit can provide a very accurate reference value for variations in process state, process error and temperature.
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