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Recent content by cmosbjt

  1. C

    HFSS Help: how to deal with the port to port capacitive coupling?

    any other thoughts on this issue? Thanks.
  2. C

    HFSS Help: how to deal with the port to port capacitive coupling?

    Do you think Q3D uses planar solver? since it comes from Ansoft as well, I think it would be easier to switch to. How good / accurate do you think Q3D is comparing with Momentum or Sonnet? Thanks.
  3. C

    HFSS Help: how to deal with the port to port capacitive coupling?

    Thanks for your reply. I am wondering if there is more practical way to handle this? I mean Ansoft must have been aware of this issue for a long time, have they done anything to deal with it?
  4. C

    HFSS Help: how to deal with the port to port capacitive coupling?

    Hi All, In HFSS, I am using Lumped Ports. I found that the capacitive coupling between ports are big. I attached an HFSS project file here. I am simulating the capacitance between two metal traces. In the first setup, I have only 2 ports at each end of traces. In the second setup, I added two...
  5. C

    Can I do "if" "then" in Cadence expression?

    In Cadence schematic simulation, can I do something like: vdc = if (SW=1) then (1) else (0) How?
  6. C

    Has anyone done EM simulation on QFN/Laminate package to extract ground inductance?

    can anyone help? Thanks a lot.
  7. C

    Has anyone done EM simulation on QFN/Laminate package to extract ground inductance?

    Thanks sezgyno, I only have HFSS12. I am not sure how to save it as HFSS10 format. In the simulation setup, I just draw a 3x3x0.217 mm3 copper box to model the QFN ground. It's very easy to recreate the setup. Thanks, Luo
  8. C

    Has anyone done EM simulation on QFN/Laminate package to extract ground inductance?

    any one can help? thanks
  9. C

    Has anyone done EM simulation on QFN/Laminate package to extract ground inductance?

    I am using HFSS. Do you know how to setup the port? I have the HFSS12 project file attached, the ground inductance is around 0.05nH. But I am not sure if the setup is right. Can you take a look and tell me what you think? Thanks
  10. C

    Why MESFET is more linear than pHEMT?

    I read this book, I can't find the answer. Page 55-56 don't have the answer neither.
  11. C

    Where and how the NF and Gain circle move if the source degen inductor changes?

    Here is what I find in this book. Very complicated equations for the NFmin of a common emitter bipolar amplifier. It is hard to tell where the noise figure circles are and let alone it is not even an inductive source degen configuration.
  12. C

    How does different standard affect power amplifier design?

    I have no PA design background, so this could be a PA 101 question. What book has the answer? Thanks.
  13. C

    Where and how the NF and Gain circle move if the source degen inductor changes?

    Can't find any related info in that book. I mean, come on, this is an interview question, is it supposed to have a well known answer?
  14. C

    Even-mode impedance and Odd-mode impedance

    you can read the Wilkinson Power Divider analysis in Pozar's Microwave Engineering book.
  15. C

    Where and how the NF and Gain circle move if the source degen inductor changes?

    Does anyone know the answer? During the interview, I drew the Gain and NF circles based on my experience of several LNA designs. But the guy kept asking why they are located there and why they move like that. I am not sure if that guy knows the CORRECT answer, but if he does then there must be...
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