Segmented D/A converter with enhanced dynamic range
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United States of America Patent
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Apr 20, 2004
Grant Date -
Nov 7, 2002
app pub date -
May 7, 2002
filing date -
May 31, 2000
priority date (Note) -
Expired
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Abstract
A digital-to-analog converter having series-connected transistors forming high impedance current sources for respective segmented resistor strings. A series transistor forming a current sink for one resistor string presents a high output impedance by utilizing a negative feedback amplifier. The effects of a headroom resistor and an offset resistor in one resistor string are negated by configuring an output amplifier with appropriate gain resistors. A highly accurate D/A conversion can be achieved by utilizing all resistors of the main and sub-resistor strings with the same value.
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