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Total integrated noise figure

itos

Hi,

I would like to get the total integrated noise figure.

With "Direct Plot" in ADE L I can obtain the integrated value for pnoise but not for noise. Why?

So I would like to do it manually but I do not know how.

If I use iinteg(getData("/NF" ?result "noise")) I get not the real result. My assumption is that the data is in logarithmic scale.

So how do I get the actual noise figure (integrated) for pnoise and noise?

Thanks!

Parents

  • It's a bit more complicated than that. You can't really integrate the noise figure directly, because it's in dB, plus the fact that you really need to properly take into account the load noise and so on.

    I used the direct plot form for pnoise and then used the "Add to outputs" and get this expression:

    10*log10(integ((getData("out" ?result "pnoise")**2-pv("PORT3" "total" ?result "pnoise")) 1K 10M)/integ((getData("out" ?result "pnoise")**2-pv("PORT3" "total" ?result "pnoise"))/(10**(getData("NF" ?result "pnoise")/10)) 1K 10M))

    The 1K and 10M are the integration limits, and the ?result "pnoise" would need to change the ?result "noise". The PORT3 is the name of my output port (the load). The "out" is the total output noise, not the name of a signal - so that would be unchanged - similarly "NF" is the output noise figure.

    Of course, this should really be available from the Direct Plot form for noise analysis too - you should contact customer support to request that.

    Regards,

    Andrew.

Reply

  • It's a bit more complicated than that. You can't really integrate the noise figure directly, because it's in dB, plus the fact that you really need to properly take into account the load noise and so on.

    I used the direct plot form for pnoise and then used the "Add to outputs" and get this expression:

    10*log10(integ((getData("out" ?result "pnoise")**2-pv("PORT3" "total" ?result "pnoise")) 1K 10M)/integ((getData("out" ?result "pnoise")**2-pv("PORT3" "total" ?result "pnoise"))/(10**(getData("NF" ?result "pnoise")/10)) 1K 10M))

    The 1K and 10M are the integration limits, and the ?result "pnoise" would need to change the ?result "noise". The PORT3 is the name of my output port (the load). The "out" is the total output noise, not the name of a signal - so that would be unchanged - similarly "NF" is the output noise figure.

    Of course, this should really be available from the Direct Plot form for noise analysis too - you should contact customer support to request that.

    Regards,

    Andrew.

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