FIR filter of sigma delta DAC

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digital sigma delta dac

Dear all :

I will design the FIR filter of sigma delta DAC . Does anyone have any experiment ? OR any good example or web-site , Thanks
 

sigma delta dac filter

Have a look on the sigma delta toolbox: https://www.mathworks.com/matlabcentral/fileexchange/loadFile.do?objectId=19&objectType=file

Have a look on this also www.iet.ntnu.no/~ivarlo/files/School/Phd/interpolation_filter.pdf

The basic idea is to interpolate the signal in more than one stages in order to reduce computational complexity. Consider also using a sinc filter for the last stage.

In matlab there are functions/fdatool under simulink for designing interpolators and half band filters (for x2).

Have in mind polyphase implementation.
 

sigma delta dac

if you'll target xilinx FPGAs then you can use system generator from xilinx, which is available as an add-on with simulink
 

fiir filtr

Dear All :
If I designthe FIR is analog FIR filter , It is noiseshaping out + Analog FIIR filter . Does is the same ? Thanks
 

toolbox sigma delta fir filter

The sigma delta DAC chain has:

-A digital FIR interpolation filter (up samples signal from Fs to Fs*OSR and suppresses image replicas because of up sampling). The interpolation stage can be made with IIR filters. But IIR filters do not have the property of linear phase which in audio for example is important.

-A SD digital modulator which is fed with the digital interpolated signal and operates under OSR*Fs

-An analog low pass reconstruction filter which can be an IIR (Butterworth or Chebyshev)
 

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