Sigma Delta Modulator - noise shaping filter

[hkchan]

Sigma Delta Modulator

What will be the block topologies for the noise shaping filter with transfer function:

F[z] = (1.9715*z^4 - 6.0354*z^3 + 7.2881*z^2 - 4.0511*z + 0.8678 )/(z^5 + 4.9665*z^4 - 9.8997*z^3 + 9.8997*z^2 - 4.9665*z +1)

I wish to implement it in Simulink using Sigma-delta toolbox but have no idea how to transform the given transfer function. Anyone can help?

 

[hobgoblin]

Re: Sigma Delta Modulator

z=roots(b)
p=roots(a)
H=zpk(z,p,1)
[cifb_a,cifb_g,cifb_b,cifb_c] = realizeNTF(H,'CIFB')

b and a are filter numerator and denominator coefficients.