High precision SAR converter using resistor strip with auto zeroing function
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United States of America Patent
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Mar 4, 2003
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N/A
app pub date -
Jul 9, 2001
filing date -
Oct 15, 1999
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Abstract
A digital-to-analog converter having a semiconductor resistor strip with plural voltage taps. One voltage tap formed of the semiconductor material defines a nonzero reference voltage for the converter. An auto-zeroing amplifier is utilized to charge a coupling capacitor to the nonzero reference voltage. In the conversion process, the analog voltages at the other voltage taps of the resistor strip are selected via a switch arrangement and coupled to the coupling capacitor. The linearity of the digital-to-analog converter is thus more independent of parasitic resistances that may be formed in the ground connection to the resistor string.
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