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Structure of DSM in delta-sigma toolbox of MATLAB

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pancho_hideboo

pancho_hideboo

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The following new structures are supported in "realizeNTF()" and "realizeQNTF()" of newest Delta Sigma Toolbox(Version 7.3, July 3, 2009) of MATLAB which was developed by Richard Schreier.

(1) PFB ; Parallel feedback
(2) PFF ; Parallel feedforward
(3) Stratos ; A CIFF-like structure with non-delaying resonator feedbacks,contributed in 2007 by Jeff Gealow

Is there anyone who know these structure ?

For example, what is the difference between "PFF(Parallel feedforward)" and the "FF(Feedforward)" ?
 

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