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  1. R

    HFSS Transformer simulation problem

    ads transformer hfss Hi, tompsom, I did not download your hfss project before, therefore I only guessed that you might have the thin layer problem. Now I've downloaded your project, I do not quite understand your project ... I'm just curious, does the transformer structure in your HFSS...
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    HFSS Transformer simulation problem

    transformer simulation Hi, tompson, Don't worry, "[error] Initial mesh, process mesh3d : Unable to recover all the surface triangles." might be caused by the large ratio between the layers' length/width and thickness. If you have very thin layers, please merge it into other layers. In...
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    Why do I get unsymmetric Mag E plot in HFSS?

    Thank you, pengboy and costox. I did define two lumped ports, using driven terminal solution type. Did pengboy mean that I only need to define one differential port? Regards, Ruri
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    Ground ring setup when simulating inductors in HFSS

    Hi, Leander, It seems that we're doing pretty much the same thing, glad to hear that... I am using momentum too, but I think the Mom results sometimes is far too optimistic. Since UMC has released its design kit in HFSS, I think HFSS is still reliable, what's your opinion? We may try more on...
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    Doing Multiple Solution runs in HFSS

    hfss batch file Hi, tompson, HFSSv10 can help you, it has the feature of queque simulation. However, I think EM modeling is a long term process, it is hard to have everything done in one month. Good luck! Ruri
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    Why do I get unsymmetric Mag E plot in HFSS?

    Hi, I simulated an totally symmetric inductor in HFSS, but when I check the E field, I found that the plot is totally un-symmetric, I even can not see another port !! (I changed the phase and do the annimation, but still found the unsymmetry). Attached please find the Mag_E plot, thanks. Ruri
  7. R

    Ground ring setup when simulating inductors in HFSS

    Hi, Leander and GoaGosha, I'm so glad that someone put forward this subject, coz I'm having the same issue. I found that using HFSS to simulate the inductor with ground ring is really troublesome. Leander, did you notice that the UMC spiral have cut in the ground rings? The weird thing is...
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    What's wrong with my current distribution in HFSS?

    how to get current distribution in hfss Hi, all, I'm using HFSS to simulate an on-chip inductor, but whatever setting I used, still get bad results comparing with the measured data: the inductance is about 0.1nH larger, and the quality factor is about 6 less. Someone told me that the current...
  9. R

    spiral inductor simulation

    Hi, Rautio, Sorry for my late response. Guard ring is a big issue in spiral inductor modeling, but as far as I know, few info. regarding it is availabe. You mentioned to use via (I think it is contact) to ground the guard ring, but how? how to connect one object to the "ground", where is the...
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    spiral inductor simulation

    Hi, Rautio, Thanks for your timely reply. Actually I've already built the guard ring exactly the same way as the layout, but only leaving it floating (conneted to nothing), the simulated result did not give significant difference with the one without the guard ring. I'm wondering how to let...
  11. R

    spiral inductor simulation

    Thank you, Rautio, it is so kind of you. I have one more question, hope to get some advice from you. Since most of the spiral inductors provided by foundries have guard rings (tied to a.c. ground), how to deal with this in EM simulations? Thanks again, and hope to have your response soon. Ruri
  12. R

    spiral inductor EM Simulator

    Hi, Frank, I have almost the same issue, the HFSS simulated results is much worse than measurement (both Q and L), have you figure out why? And I found that not many guys here have the same issue, but get no answers. You'll be highly appreciated if you share your opinions, Ruri
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    spiral inductor simulation

    Hey, guys, I have the same problem, there're huge difference between the simulated one and the measured one. Normally, the simulated Q value is larger than the meas. one, but I have the opposite result: the HFSS simulated Q value is about 4~6 less than the measured one at the peak. I followed...

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