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A few questions regarding using PSS for rectifier design

MenghanSun

Dear all,

I'm using PSS for rectifier simulation and try to look at the voltage and currents in steady state. I'm trying to improve the accuracy of the PSS and try to get the same results as in the transient simulation (after it settled).

Currently, I use the Harmonic Balance mode. However, I heard Shooting Newton is better as it is only a wrapper for transient simulation. But, personally, I find HB to be more stable. From reading the user manual, when the over_sampling factor is set to be very big, the accuracy is very high. But how big should we set to this over_sampling factor to be? The higher, the better? Also, is there any additional way to improve the accuracy of the pss simulation? max_iters?

Also, does PSS support multi-thread? How to activate this?

I found PSS HB sometimes giving the correct results (i.e. the same as transient), other times not giving the correct result. Is this because I'm not setting the convergence parameters properly?

I know the port element in cadence only provides power in reference to 50 Ohm. Could you please recommend a solution if we have to use a port that has complex impedance? For example, a rectifier driven by custom antenna whose impedance conjugatively matched to the rectifier.

I use mmsim14 + ic616.

Thank you very much,

Menghan

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  • MenghanSun
    Thank you very much for your reply, Andrew.

    How to set reltol through the GUI (ADE)? For the accuracy parameters, I only see, iteratio, steadyratio, itres and I don't see reltol anywhere (in the simulation option forum).

    From reading spectre.out, it seems that reltol has been set to 1e-4 by default, errpreset = conservative. Is that a reasonable value? With this setting, I still observe about 1~2% (sometimes 3) discrepancy for results (e.g. rectifier's output DC). Does this sound reasonable to you?

    Many thanks,

    Regards,
    Menghan
Reply
  • MenghanSun
    Thank you very much for your reply, Andrew.

    How to set reltol through the GUI (ADE)? For the accuracy parameters, I only see, iteratio, steadyratio, itres and I don't see reltol anywhere (in the simulation option forum).

    From reading spectre.out, it seems that reltol has been set to 1e-4 by default, errpreset = conservative. Is that a reasonable value? With this setting, I still observe about 1~2% (sometimes 3) discrepancy for results (e.g. rectifier's output DC). Does this sound reasonable to you?

    Many thanks,

    Regards,
    Menghan
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