Rotating gain resistors to produce a bandgap voltage with low-drift
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United States of America Patent
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Oct 2, 2012
Grant Date -
Jun 2, 2011
app pub date -
Mar 5, 2010
filing date -
Dec 2, 2009
priority date (Note) -
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Abstract
In accordance with an embodiment of the present invention, a bandgap voltage reference circuit includes a plurality of circuit branches, a plurality of resistors and a plurality of switches. The plurality of switches are used to selectively change over time which of the resistors are connected to be within a first one of the circuit branches and which of the resistors are connected to be within a second one of the circuit branches, to thereby reduce the effects that long term drift of the resistors have on a bandgap voltage output (VGO) of the bandgap voltage reference circuit.
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