A question about the Sigmadelta ADC using the Richard Schreier Tools

[gdhp]

Hi all

I have a puzzle when using the Sigmadelta ADC design tools by Richard Schreier.

For the function of SynthesizeNTF, with a argument of 'H_inf', which is the maximun out-of-band gain of
NTF.
For 1-bit, maybe Lee-rues can used, that H_inf=1.5;
While for multi-bits, How to set the value of H_inf? Is there some trick here?

Thanks

 

[gdhp]

Is there any answer?