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mixer pxf simulation error(IC5141,Cadence workshop document)

a343nc3

Hello

The document I referenced is https://filebox.ece.vt.edu/~symort/rfworkshop/Mixer_workshop_instruction.pdf. (This is cadence workshop document)

While following the pxf simulation in the above article, the results are different and I have a question.

My result picture is shown below.

<my result error>

<document result>

<my direct plot>

<document direct plot>

The difference with the documentation is that in the direct plot screen after the pxf simulation,

1.output harmonics-> input sideband

2.Frequency axis: out-> frequency axis: absin

3.The results for port0 (RF port) are also different (see photo below).

4.The frequency values in the box are different.

My screen shows 5G, 10G, 1K ~ 10M, but the document is the same as 1K ~ 10M.

Ask for a solution. Thank you.

Parents

  • OK, you're working off a 15 year old workshop instruction book, so my ability to test this is limited. Anyway, it looks as if the key difference is:

    1. I suspect that the workshop example was run with freqaxis=out rather than the default freqaxis=absin (it may be that this is set in the state that the instructions suggest loading, as it's not explicitly stated in the text of the instructions)
    2. You're picking a different sideband number. You picked 0, whereas in the instructions they picked -1. The -1 sideband corresponds to an input frequency of 5G-10M to 5G-1K - in your setup you should get the same y values but the x-axis would be in terms of the input frequency not output frequency because of the difference in freqaxis settings (the freqaxis setting is on the pxf options form). You've picked sideband 0 which corresponds to a signal at the baseband frequency - i.e. no frequency translation at all by the mixer.

    Hope that helps.

    Andrew.

Reply

  • OK, you're working off a 15 year old workshop instruction book, so my ability to test this is limited. Anyway, it looks as if the key difference is:

    1. I suspect that the workshop example was run with freqaxis=out rather than the default freqaxis=absin (it may be that this is set in the state that the instructions suggest loading, as it's not explicitly stated in the text of the instructions)
    2. You're picking a different sideband number. You picked 0, whereas in the instructions they picked -1. The -1 sideband corresponds to an input frequency of 5G-10M to 5G-1K - in your setup you should get the same y values but the x-axis would be in terms of the input frequency not output frequency because of the difference in freqaxis settings (the freqaxis setting is on the pxf options form). You've picked sideband 0 which corresponds to a signal at the baseband frequency - i.e. no frequency translation at all by the mixer.

    Hope that helps.

    Andrew.

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