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How to simulate pnoise of fractional (non-integer) frequency divider

yino

Hi there,

I tried to simulate pnoise of the frequency divider with a divider ratio of 4.5 (non integer value). however, I have a hard time in setting the beat frequency to be Freq_in/4.5 with relative harmonic = 1, as it complaints about the fundamental tone (=Freq_in) must be integer multiple of beat frequency. The cadence version that I use is ICADV12.3 and MMSIM version is 16.1.0.479.isr9.

Thank you in advance for all your replies.

Yin

Parents
  • Andrew Beckett

    Yin,

    If using PSS, all frequencies must be an integer multiple of the fundamental because otherwise the result would not be periodic - you wouldn't be able to do the Fourier analysis of the interval if it contained 4.5 cycles of the fundamental.

    Presumably you could set the fundamental to be Freq_in/9 and then use relative harmonic=2 for the pnoise?

    Regards,

    Andrew.

Reply
  • Andrew Beckett

    Yin,

    If using PSS, all frequencies must be an integer multiple of the fundamental because otherwise the result would not be periodic - you wouldn't be able to do the Fourier analysis of the interval if it contained 4.5 cycles of the fundamental.

    Presumably you could set the fundamental to be Freq_in/9 and then use relative harmonic=2 for the pnoise?

    Regards,

    Andrew.

Children
  • yino
    in reply to Andrew Beckett

    Thanks Andrew. your suggestion works perfectly. 

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