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JordanD's avatar
JordanD
Icon for New Contributor rankNew Contributor
4 years ago

FIR II Decimation Frequency Response

I'm designing a filter with the FIR II IP. Input data rate is 64 MHz and decimation factor is 8. I want the frequency response to be low pass cut off at 3.2 MHz. The confusing thing is whether the ...
CheepinC_altera's avatar
CheepinC_altera
Icon for Regular Contributor rankRegular Contributor
4 years ago

Hi,


Thanks for your help. Sorry for the inconvenience. I still get into the following error:


Error using .*

Matrix dimensions must agree.


Error in fir_inspect (line 5)

sinevector=(2^(inBits-1)-1)*sin(2*pi*clock.*freqsMhz'/smpRateMhz);


It seems like the clock dimension mismatches with freqsMhz. Also, I have tested manually change the clock to 1x65, it will prompt another error on " '/ " operator. I changed to " ./ " the file can run but the simulation output is a waveform like plot which I believe due to incorrect changes from my side.


Note that I have not run the Modelsim but just testing on the .m file since there is a decim_fir_output.txt available in your folder.


Please let me know if there is any concern. Thank you.


  • JordanD's avatar
    JordanD
    Icon for New Contributor rankNew Contributor
    4 years ago

    Thanks for your patience. I've never had so much trouble with matlab compatibility... Please try the attached.