Method for obtaining a temperature--independent voltage reference as well as a circuit arrangement for obtaining such a voltage reference
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United States of America Patent
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Mar 18, 2003
Grant Date -
Oct 4, 2001
app pub date -
Mar 12, 2001
filing date -
Mar 10, 2000
priority date (Note) -
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Abstract
In a method for obtaining a temperature-independent voltage reference by an energy gap reference circuit using at least one bipolar transistor and a voltage source, only a single bipolar transistor is connected in series with a resistor. Different voltages are facultatively applied to the resistor. The voltages are detected upstream and downstream of the series resistor and fed to an A/D converter. The gain constant of the A/D converter is calculated from the digitalized measurements and used for measurement correction. The circuit arrangement for obtaining such a temperature-independent voltage reference includes a bipolar transistor and a resistor connected in series with the transistor. An A/D converter configured to yield digitalized voltage measurements is connected via switches to ports provided on either side of the resistor. The digital signals from the A/D converter are fed to a computer to determine the gain constant, from which the corrected voltage signal can be read out digitally.
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