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Class D Switching Power Amplifiers and Power D/A conversion

loop filter design in CT SDM question
loop filter design in CT SDM question
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Old 6th January 2012, 06:42 AM   #1
surZ90 is offline surZ90  Indonesia
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Join Date: Feb 2011
Lightbulb 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?

thanks.
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Old 6th January 2012, 08:42 AM   #2
surZ90 is offline surZ90  Indonesia
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Join Date: Feb 2011
I use this SDM for my class D Amp project.
Can anybody help me?
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