Oversampled digital-to-analog converter for multilevel data transmission
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United States of America Patent
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Mar 30, 1993
Grant Date -
N/A
app pub date -
Nov 7, 1991
filing date -
Nov 7, 1991
priority date (Note) -
Expired
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Abstract
A digital-to-analog converter (DAC) is disclosed which uses an oversampled modulation technique followed by an analog lowpass filter to generate an output waveform with four precisely controlled amplitude levels for 2B1Q data transmission applications. The DAC accepts a 2-bit input word at the baud rate and generates one of four possible analog output amplitudes having relative ratios of +3, +1, -1, and -3.
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