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PAM4 Signal using ahdllib or bmslib

growingmind

I want to generate a PAM4 signal using an ahldlib or bmslib block (I know rand_bit_stream exists in ahdl library and I have used it).

Can I generate a PAM4 signal using rand bit stream block and if so, how ?

Parents

  • No, these don't generate PAM4 signals. Whilst of course you could write a model to do so, it's probably simpler to use the "vsource" component from analogLib, which  you can then set the Source Type to "prbs" and then there's a field called "PAM4 modulation". If you set that to "pam4" then you can produce a PAM4 signal. This is a relatively recent addition (I can't remember when) - but hopefully it's available in the version you're using.

    Regards,

    Andrew.

  • in reply to Andrew Beckett

    I set the "vsource" as you suggested, but I can only get a NRZ pattern.

    Is there anything wrong with my setting?

  • in reply to AmberC

    My guess is that you're using an old spectre version before PAM4 was supported? Can you check if there are any warning messages in the spectre output file related to this source, and also post here which spectre subversion is being used (this will appear towards the top of the spectre output log file).

    Regards,

    Andrew.

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  • in reply to AmberC

    My guess is that you're using an old spectre version before PAM4 was supported? Can you check if there are any warning messages in the spectre output file related to this source, and also post here which spectre subversion is being used (this will appear towards the top of the spectre output log file).

    Regards,

    Andrew.

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