Method and apparatus for a high-drive current digital-to-analog converter
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United States of America Patent
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May 25, 2004
Grant Date -
Jul 10, 2003
app pub date -
Jan 6, 2003
filing date -
Jan 4, 2002
priority date (Note) -
Expired
status (Latency Note)
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Abstract
The invention is a method and apparatus for a digital DSL line driver that comprise a multi stage delta-sigma modulator with a high current 1-bit digital-to-analog converter (DAC) output stage. By adding the high current drive capability to the 1-bit DAC in a delta-sigma digital-to-analog converter the traditional DSL line driver used in digital subscriber lines applications is made less complex and it saves on the overall power consumption. The invention uses a transistor switch arrangement to save the overall power by alternately switching 'ON' some the transistors while having other transistor turned 'OFF'.
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