Bandgap reference circuit for low supply voltage applications
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United States of America Patent
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Jul 5, 2005
Grant Date -
Dec 4, 2003
app pub date -
Jun 3, 2002
filing date -
Jun 3, 2002
priority date (Note) -
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status (Latency Note)
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Abstract
A bandgap reference-based voltage and current generator has a distributed circuit architecture, to reduce the number of voltage dropping components between voltage supply rails containing bandgap voltage generator circuitry. Base current error compensation circuitry is incorporated into current mirror circuits of the generator to yield a composite current having a desired component, defined exclusively in accordance with the desired bandgap voltage, and a base error component containing the desired bandgap voltage, but modified by a second base current error. By differentially combining these two components, the multiple port output current mirror stage removes the base error component of the composite current, leaving only the desired bandgap-based component at each of plural precision output current ports.
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