Problem: designing a Class D with second order continuous time Delta-Sigma Modulator

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Hello all.

I'm building a audio class D amplifier with a second order continuous time delta-sigma modulator, but i'm having trouble on obtaining the values of the Rs and Cs of the integrators.
I first started with a first order modulator and everything went fine, but now i have the need of improving the SNR.
Does any of you know any reference or book, that can help me on this matter? I've already tried the "Understanding Delta-Sigma Data Converters", but this book is highly pointed to discrete modulators.

I've seen all the related topics on this forum and still, my problem presists.

Thanks in advance.
João Carvalho
 
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