Look-ahead delta sigma modulator with quantization using natural and pattern loop filter responses
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United States of America Patent
Stats
-
Jan 30, 2007
Grant Date -
Jul 21, 2005
app pub date -
Nov 22, 2004
filing date -
Jan 16, 2004
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A look-ahead delta sigma modulator reduces and simplifies the computations used to generate quantizer output values. Superposition can be applied to a loop filter response of the look-ahead delta sigma modulator. By superposition, the complete loop filter response for each output candidate vector equals the difference between a forced pattern response and a natural input signal response. The forced pattern response of the loop filter can be determined from the response to each output candidate vector with an input signal set to zero and loop filter state variables initially set to zero when determining the loop filter response for each output candidate vector. The natural input signal response of the loop filter can be determined from the response to each input signal vector with feedback data set to zero. The forced pattern response is independent of the input signal data and can be determined once for all input signal vectors X.sub.t. The natural input signal response is independent of the feedback data and, therefore, need only be determined once for each output data value.
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- 8 Citation Count
- H03M Class
- 2.18 % this patent is cited more than
- 18 Age
