How to design Quadrature Delta-Sigma ADC ?

[pancho_hideboo]

Hi.

I'm now trying to design high order single loop quadrature bandpass delta-sigma ADC.
I know delta-sigma toolbox of MATLAB which was developed by Richard Schreier.
This toolbox is useful for real delta-sigma ADC, but can't be used
for quadrature(complex) delta-sigma.

How to design high order quadrature bandpass delta-sigma ADC systematically ?
Is ther any simple solution for applying delta-sigma toolbox to complex DSM ?

 

[pancho_hideboo]

Newest Delta Sigma Toolbox(Version 7.3, July 3, 2009) have functions for handling quadrature(complex) delta-sigma such as "synthesizeQNTF()", "realizeQNTF()", etc.

I can synthesize NTF by using "synthesizeQNTF()".
Next I can get the ABCD matrix by using "realizeQNTF()".

Finally how can I determine the coefficient like the [a,g,b,c] in real delta-sigma structure ?

And there are forms of "FF/FB/PFF/PFB" for the quadrature(complex) structure.
What is the difference between them and the "CIFF/CIFB/CRFF/CRFB" for real delta-sigma structure ?