Look-ahead delta sigma modulators with quantizer input approximations
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United States of America Patent
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-
Aug 1, 2006
Grant Date -
Jul 21, 2005
app pub date -
Jan 18, 2005
filing date -
Jan 16, 2004
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A signal processing system includes a look-ahead delta sigma modulator having an approximation generator to approximate quantizer input signals. A look-ahead delta-sigma modulator can be implemented as a noise shaping filter and a quantizer. The quantizer can be implemented as a function generator. State variables of the noise shaping filter provide the input data from which the function generator determines a quantizer output signal. Latter state variables are more dominant in determining the quantizer output signal. Accordingly, earlier state variables can be approximated to a greater degree than earlier state variables. The approximations can result in slightly lower output signal accuracy but can significantly decrease implementation cost. Additionally, latter state variables can completely dominate (i.e., be deterministic) the quantizer output signal. This situation can result in a further, slight increase in the non-linearity of one or more quantization region boundaries.
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- 8 Citation Count
- H03M Class
- 0.96 % this patent is cited more than
- 19 Age
