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4-Path Mixer IIP3 calculations

Gabru

Hi,

I'm trying to calculate IIP3 of a 4-path mixer. I've 6 PORTS in my circuit: 1 for RF, 1 for LO (I created quadrature signals using delay block of analoglib) and 4 PORTS on the output.

When I tried to simulate this using (qpss using hb), I got an error (screenshot attached)

My circuit:

Simulation test bench:
   

Error I got:

Please let me know the correct way to calculate these parameters for N-path mixers;

Regards
Arpit

Parents

  • You are using ADE L.   This is very old.  There will be no fixes to ADE L.   You need to user ADE Explorer instead.   There are a variety of common RF setups described in this Article on COS. SpectreRF Application Notes and Tutorials - One of our best kept secrets!    See

    RF Documentation Workshop and Database:

    • ​Workshop database is located here: <SPECTRE21.1>/tools.lnx86/spectre/examples/Legacy/RF_Doc_Database.tar.gz

    It has a Mixer example which should get you started in ADE Explorer.  It doesn't cover your exact example.  For that, I recommend filing a Case on https://support.cadence.com .

    best regards,

    Tawna

  • in reply to Tawna

    In addition to what Tawna said, you didn't say which version of any of the tools you're using - IC version or Spectre version. You didn't say when that error occurred (from doing some searches and based on the function names referred to, my guess is that it's from the Direct Plot form, so that suggests that simulations completed - I see the hints of a "successful" in the small screenshot you shared above the error messages).

    Also, there's not a particularly good reason to use qpss in hb mode; you'd be better off using the hb analysis directly. qpss (with hb) is mainly supported for legacy support reasons or if you need to easily switch between shooting and hb qpss modes.

    Andrew

  • in reply to Andrew Beckett

    Hi Andrew Thanks for the reply.

    I tried calculating the IIP3 and P1dB values for the given N-Path mixer using three-tone hb analysis.
    I now know the procedure of getting the IIP3 and P1dB values.

    But I've two major queries here:
    1. What value to give in Mxham (no. of harmonic of LO in hb analysis), somewhere it is mentioned as auto, somewhere it is mentioned as 5?
    2. What value to give as ep (extrapolation point) in the direct plot form?

    The circuit:

    The ADE-L and hb analysis options:

     

    Direct plot form: 

    Please help regarding this.

    Regards
    Arpit

  • in reply to Gabru

    Hi,

    I forgot to mention the versions.

    IC617 & spectre 17.1.0.238.isr4

    Regards
    Arpit

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