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Recent content by wufeng

  1. W

    TSMC inductor HFSS simulation vs TSMC PDK

    HI guys, I am simulating a one-turn differential TSMC inductor with HFSS. The Q value from HFSS is dependent on the setup in the simulation. If I use guard ring as return path the Qmax will be lower and f(Qmax) will be higher. If I use a ground ring as return path, the Q max will be higher and...
  2. W

    TSMC inductor design kit vs HFSS simulation

    HI guys, I am simulating a one-turn differential TSMC inductor with HFSS. The Q value from HFSS is dependent on the setup in the simulation. If I use guard ring as return path the Qmax will be lower and f(Qmax) will be higher. If I use a ground ring as return path, the Q max will be higher...
  3. W

    cellphone antenna review

    Hi everyone, I wonder if there is a good review paper on cellphone antenna? I want to learn which antenna is popular currently? Thanks! Wufeng
  4. W

    how to obtain cgs in ADS

    Hi Guys, I wonder how to obtain Cgs of an NMOS transistor in 0.18 um TSMC design kit with ADS? How can I get the information of the transistor through DC analysis like in cadence. Thanks! Wufeng
  5. W

    DC biasing for S parameter measurement up to 40 GHz

    Hi Guys, I want to measure the S parameters of my transistors up to 40 GHz. What kind of biasing network I should use? I noticed that normal SMT capacitors and SMT inductors only go up to ~10 GHz. Thanks! Wufeng
  6. W

    RF AB type power amplifier tutorial

    Hi Guys, Help. I need an push-pull AB type rf power amplifier tutorial with ADS. Please!
  7. W

    Question on current pulse measurement

    Hi guys, I want to measure the current of a 0.1ms signal. The amplitude of the current is about 100nA. Does anybody know how to do it? Thanks! Jianwei
  8. W

    question on hfss lumped port

    Also I found if I use the driven modal, I can renormalize with <re>+<im>j. That means if I change the imaginary part, the S11 will change too. But for driven terminal mode, only real part can change the S11. The imaginary part has no effect on S11. Does anyone know why?
  9. W

    question on hfss lumped port

    Sorry. I made a mistake. I mean driven terminal.
  10. W

    question on hfss lumped port

    Hi Guys, I am simulating a loop antenna with HFSS. Since the diameter of the loop antenna is very small, it does not resonant at the working frequency. I use the driven mode and lumped port. From Z11 I can see the input impedance is 818-158j. So I plan to add an inductor to cancel out this...
  11. W

    question about loop antenna

    Hi Guys, I use HFSS to simulate a loop antenna. But I found out when I reduce the radius of the wire, the input impedance goes up. Does that make sense? I use the lumped port. Thanks
  12. W

    generate diode model in ads from DC IV curve

    All I got is the I-V curve. Can I extract those model parameters from only I-V curve?
  13. W

    generate diode model in ads from DC IV curve

    Hi Guys, I got I-V curves of a MIM diodes from experiment. How can I generate a diode model in ads? Thanks a lot!
  14. W

    Question about antenna testing

    Hi Guys, I have a simple question. Why people don't use cavity to test antenna? How about small antenna? Thanks!
  15. W

    Questions on TSMC 0.18um rf design kit

    Hi Guys, I am new to TSMC 0.18um rf model. I am trying to simulate a LNF, but I met two problems. 1) The NMOS's width is 30 um. So I set the nr to be 12. But there is a worning message saying the minimum value is 16. 2) The inductanc needed is 0.7nH. But the minimum value is larger than this...

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