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Altera_Forum's avatar
Altera_Forum
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15 years ago

problems about filter design using fir compiler v9.1

Hi !

I have designed a filter in MATLAB with the fixed coefficients, and simulink is pass ，meet the requirements。So export the fixed coefficients to fir compiler v9.1 , set the Structure Type to Fully Parallel Filter。 When run in FPGA，the results of filter output is different from matlab , Error will increase when the data is large.

thanks for reply

3 Replies

  • Altera_Forum's avatar
    Altera_Forum
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    15 years ago

    Hello,

    What are your filter settings? (coefficient bitwidth, scaling, output bitwidth etc.)

    Grt,

    Olaf
  • Altera_Forum's avatar
    Altera_Forum
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    15 years ago

    Hi， Olaf

    The coefficient has been exported fir compiler v9.1 , So I set scaling options for "none" ，the same as MATLab。 output bitwidth is

    “full solution”。
  • Altera_Forum's avatar
    Altera_Forum
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    15 years ago

    Did you check the errata for the fir compiler? perhaps this is a known issue and already has a workaround..