Coded data generation or conversion – Analog to or from digital conversion – Differential encoder and/or decoder
Patent
1998-04-16
1999-11-09
Williams, Howard L.
Coded data generation or conversion
Analog to or from digital conversion
Differential encoder and/or decoder
341144, H03M 300
Patent
active
059823178
ABSTRACT:
A error-shaping digital-to-analog (D/A) converter system [100], consisting of a separator [102], a set of D/A converters [104] [108], a set of optional analog filters [106] [108], a summation device [112], and an optional analog filter [114]. The separator [102] separates the digital input signal into a set of low-resolution signals of which only one has significant power in the system's signal band. These signals are D/A converted by mismatch-shaping D/A converters [104] [108], in some embodiments filtered by analog filters [106] [108], and then added by the summing device [112]. Imperfections of the employed D/A converters [104] [108] will only cause very small errors in the signal band, such errors being essentially uncorrelated to the digital input signal. The D/A converter system is comparable to a scaled-element D/A converter in which the distortion is transformed into a noise component having very little power in the signal band.
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Steensgaard-Madsen Jesper
Williams Howard L.
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