* A third order DeltaSigma. From paper by Fiori&Maloberti at ecctd2005
in 10 1
10 20 z^(-1)
20 10 3
20 10 -3*z^(-1)
20 10 z^(-2)
20 noi k
noi out 1
out dac (3-3*z^(-1)+z^(-2))
dac in -1
.pre syms z k
.tf in out
.tf noi out
.post k=1;z=tf('z',1);