Multiplier Free Digital Filter

Discussion in 'Off-Topic' started by rughooam, Feb 1, 2018.

  1. rughooam

    Thread Starter New Member

    Feb 1, 2018
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    Hi,
    I have some questions regarding tools that can design Multiplier Free Digital IIR Filters to be implemented in an FPGA. I am not sure in which forum such a question would fall into or if this is the appropriate website for such a question. If somebody could guide me, I would appreciate that,
    Thanks
    Amish
     
  2. Papabravo

    Expert

    Feb 24, 2006
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    What kinds of filters could such a thing implement? Certainly an FIR or IIR filter would be out of the question. Not sure what else there is.
     
  3. RichardO

    Late Member

    May 4, 2013
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    Does shifting left by 1 or more bits count as multiplying?
    :rolleyes:
     
  4. rughooam

    Thread Starter New Member

    Feb 1, 2018
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    Actually there are white papers out then of how to implement FIR and IIR with bit shift and add approximation to multiplication. Search for "Design of Multiplier-free State-Space Digital Filters"
    I am just wondering if there is a tool that would prevent me from having to do it manually.
     
  5. Papabravo

    Expert

    Feb 24, 2006
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    I guess you can build filters where all the coefficients are powers of 2, but so much for being able to meet actual filter requirements. For example, can you do a Butterworth filter this way? If not can you tolerate the passband ripple?
     
  6. joeyd999

    AAC Fanatic!

    Jun 6, 2011
    4,200
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    Is it difficult to build a hardware MAC into a modern FPGA? I wouldn't think so, but this is not my area of expertise.
     
  7. rughooam

    Thread Starter New Member

    Feb 1, 2018
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    We are running out of MACs :( and yes at this point it's unknown if our system would be able to handle the distortion to the filter characteristics once we do the power of 2 conversion but we won't know if we don't try.
     
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