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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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  • mabouzied

    Dear Andrew,

    Thanks for your replays.

    At page 40 of the following LNA workshop:

    http://www.cdnusers.org/community/virtuoso/resources/SpectreRF_LNA533AN.pdf

    For the IIP3 graph:

    the 3dB/dB is wrong spcially for the -50dBm input. Why the curve fails at such low input value?

    Is it a simulation issue or circuit issue?

    Best regards,

    Mohamed

Reply
  • mabouzied

    Dear Andrew,

    Thanks for your replays.

    At page 40 of the following LNA workshop:

    http://www.cdnusers.org/community/virtuoso/resources/SpectreRF_LNA533AN.pdf

    For the IIP3 graph:

    the 3dB/dB is wrong spcially for the -50dBm input. Why the curve fails at such low input value?

    Is it a simulation issue or circuit issue?

    Best regards,

    Mohamed

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