Resistor string digital to analog converter with differential outputs and reduced switch count
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United States of America Patent
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Aug 17, 2004
Grant Date -
Jun 24, 2004
app pub date -
Dec 23, 2002
filing date -
Dec 23, 2002
priority date (Note) -
Expired
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Abstract
Resistor string DAC's are known to utilize lots of area and slow in data conversion due to the large utilization of switches. The problem becomes worse when differential outputs are required in the conversion process. This invention describes a N-bit DAC architecture utilizing a substantially lower number of switches through a unique placement of tap-points in the resistor string and decode logic. Differential outputs share the same set of switches through 2 levels of decoding.
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