Noise shaped interpolator and decimator apparatus and method
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United States of America Patent
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Jun 3, 2014
Grant Date -
Dec 8, 2011
app pub date -
Aug 16, 2011
filing date -
Aug 5, 2003
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Abstract
Improved interpolator and decimator apparatus and methods, including the addition of an elastic storage element in the signal path. In one exemplary embodiment, the elastic element comprises a FIFO which advantageously allows short term variation in sample clocks to be absorbed, and also provides a feedback mechanism for controlling a delta-sigma modulated modulo-N counter based sample clock generator. The elastic element combined with a delta-sigma modulator and counter creates a noise-shaped frequency lock loop without additional components, resulting in a much simplified interpolator and decimator.
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