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IIP3 simulations: qpss/hb vs hb

itos

Hi,


What is the difference between obtaining IIP3 of a mixer with qpss+hb engine hb itself?

I am getting signficantly different results and I thought at lea "hb" should be consistent.

See example PDF attached which compares qpss(shooting_+qpac, qpss(hb)+qpac, hb+hbac.

There are many other ways for IIP3 calculations (e.g. rapid IIP3, 3-tone with hb up to running a transient, obtaining HD3 from DFT and converting to IIP3).

What is the most reliable/consistent method for switching transistors in a modern 28nm process? (e.g. N-path filters, passive mixers, ...)

Thank you!IIP3_qpss_hb_vs_shooting_vs_hb.pdf

Parents

  • The problem with bsim4 is not dependent upon it switching - it's dependent on the Vds=0 bias (see this post).

    I don't know whether there's a similar problem with the utsoi model (as you say, it's based on the work in psp so hopefully should be OK) - I've not seen any reports of issues.

    Best bet is to contact customer support so that we can get hold of the same models and check it. 

    Regards,

    Andrew

Reply

  • The problem with bsim4 is not dependent upon it switching - it's dependent on the Vds=0 bias (see this post).

    I don't know whether there's a similar problem with the utsoi model (as you say, it's based on the work in psp so hopefully should be OK) - I've not seen any reports of issues.

    Best bet is to contact customer support so that we can get hold of the same models and check it. 

    Regards,

    Andrew

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