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problem with spectreRF

abouzied

I have the following question:

If I do iip3 simulation for an LNA and after choosing the output, the iip3 is -3dBm for example.

If I choose the net of the input as the output for iip3 calculation, it will be -3dBm(ideally it should be infinity), Why does this happen ?

I use PSS followed by PAC for simulation.

thanks in advance,

Mohamed Abouzied

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  • Andrew Beckett

    Hi Mohamed,

    I think the best way forward here would be for you to contact customer support via http://support.cadence.com - it will almost certainly be simpler to see what you're doing (with a testcase ideally) and then provide advice. You could probably simulate the whole circuit (with the mixer present) using harmonic balance (either hb analysis, or hb-based QPSS, possibly replacing one of the tones with an hbac/qpac). RapidIP3 is another possibility - but probably I'd ensure that you're getting reasonable results first.

    As I said before, looking at the spectrum at a particular input power would be a good idea to figure out what is going on.

    Best Regards,

    Andrew.

Reply
  • Andrew Beckett

    Hi Mohamed,

    I think the best way forward here would be for you to contact customer support via http://support.cadence.com - it will almost certainly be simpler to see what you're doing (with a testcase ideally) and then provide advice. You could probably simulate the whole circuit (with the mixer present) using harmonic balance (either hb analysis, or hb-based QPSS, possibly replacing one of the tones with an hbac/qpac). RapidIP3 is another possibility - but probably I'd ensure that you're getting reasonable results first.

    As I said before, looking at the spectrum at a particular input power would be a good idea to figure out what is going on.

    Best Regards,

    Andrew.

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