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EVM Measurement (envlp analysis)

illaoi

I am running envlp analysis for a PA and am taking benefit of rfLib/nr as the source and rfLib/wprobe. Tough while looking at EVM versus input power, I can only see the effect of distortion on degrading EVM and it seems the noise degradation which occurs at low input powers does not exist (obviously, because presumably simulator does not consider noise).

is there a way to add the effect of noise and distortion for EVM measurement in envlp sim?


  • illaoi


    red is what i see, though i need to see the black part too.

  • Andrew Beckett
    in reply to illaoi

    Did you turn on the noise checkbox on the envlp analysis form?

    For some details, see "spectre -h envlp" and look at the noise related parameters.

    if this doesn't help, please contact customer support.

    Andrew

  • illaoi
    in reply to Andrew Beckett

    Thanks Andrew, I saw that and also checked that activated, still do not see the lower power region. Either case, even without noise, if the signal keeps going down, you should be limited by simulator quantization noise and need to see evm grows.

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