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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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  • Andrew Beckett

    Hi Menghan,

    I'm not sure what this "discrepancy" is relative to; I would expect results to be more accurate with conservative and a relative tolerance of 1e-4, but I don't know what you're measuring or what you're comparing it with. So I can't comment if it's reasonable or not! That's why I suggested you contact customer support...

    The reltol is set on the Simulation->Options->Analog form, although I wouldn't advise wholesale setting of this parameter without knowing what you're doing. Maybe you can try setting it to 1e-5, but I have no idea what you're actually trying to do here.

    So I would strongly recommend contacting customer support.

    Andrew.

Reply
  • Andrew Beckett

    Hi Menghan,

    I'm not sure what this "discrepancy" is relative to; I would expect results to be more accurate with conservative and a relative tolerance of 1e-4, but I don't know what you're measuring or what you're comparing it with. So I can't comment if it's reasonable or not! That's why I suggested you contact customer support...

    The reltol is set on the Simulation->Options->Analog form, although I wouldn't advise wholesale setting of this parameter without knowing what you're doing. Maybe you can try setting it to 1e-5, but I have no idea what you're actually trying to do here.

    So I would strongly recommend contacting customer support.

    Andrew.

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