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How to build a filter with its file-based characteristics

800228

Hello everybody,

We has been designing a system which includes a amplifier and a filter.
- We has designed the amplifier with cadence ADE tool.
- We will use an out-sourcing filter. We dont know the detailed implementation. We only know its characteristics (frequency response, group delay,...)

We want to check whole system by simulation. Is there anyway to build a filter as a component in cadence spectre with its characteristics in a file?

Any suggestions please share? Thanks alot

  • Andrew Beckett

    Several ways:

    1. Use the Butterworth_filters or Chebyshev_filters categories of the rfLib library (<instDir>/tools/dfII/samples/artist/rfLib) (don't use the components prefixed BB as these are for baseband RF modelling). 
    2. Use the ProgFilt component from bmslib (<instDir>/tools/dfII/samples/artist/bmslib)
    3. Use the Laplace controlled sources (e.g. svcvs, svccs, scccs, sccvs) in analogLib. These allow an s-domain representation of the filter
    4. Use nport from analogLib, and give it a file of s-parameters (scattering parameters) which define the impedances and transfer functions

    Regards,

    Andrew.

  • 800228

    Thanks Andrew.

    Do you have any sample veriloga code of a filter?

    I would like to write a verilog code for the filter based on a sample code.

    Thanks again with best regards. 

            

  • Andrew Beckett

    The libraries I pointed you to (rfLib, bmslib) have VerilogA models. Also, "modelwriter" can produce an s-domain filter from a set of coefficients (although that's not rocket science).

    Regards,

    Andrew.

  • 800228

    Andrew, thanks you. From your suggestion, I find out a way.

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