High-accuracy capacitor digital-to-analog converter
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United States of America Patent
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Oct 17, 2006
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N/A
app pub date -
Apr 23, 2002
filing date -
Apr 25, 2001
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Abstract
A capacitor digital-to-analog converter for N-bit digital-to-analog conversion comprises a converter capacitor network comprising 2.sup.N capacitors and 2.sup.N+1 MOS switches and an output buffer. The MOS switches are connected in a series chain at their respective source/drain, and each of the capacitors has a first electrode connected to a corresponding joining node between two consecutive MOS switches in the series chain and a second electrode connected together to a common node. The output buffer comprises a differential amplifier and an output amplifier, the differential amplifier has 2.sup.N discrete inputs each connected to a corresponding one of the first electrodes of the capacitors in the converter capacitor network.
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