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|6th January 2012, 06:42 AM||#1|
Join Date: Feb 2011
loop filter design in CT SDM question
I want to built Sigma Delta Modulator and I have some question about loop filter in SDM.
SDM comprises a quantizer and loop filter (H) before quantizer.
then subtraction output signal (Y) and input signal (R) to be input for loop filter.
so, the filtered error (E) will be:
E = H * (R - Y)
then it can rewrite to be noise-shaping equation:
Y = R + E * H^(-1)
what is consideration design of filter H?
does it just need to H and H^(-1) to be stable?
how if I use Butterworth or Chebyshev or inverse Chebyshev filter?
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