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Recent content by eeliuliu

  1. E

    0.13um TSMC RF process 4.8GHz VCO

    hi，khouly, thank you very much! I don't understand " the flicker noise variation with the bias current "? Could u pls say more detail ? thanks!
  2. E

    0.13um TSMC RF process 4.8GHz VCO

    I'm designing 4.8Ghz VCO with 0.13um TSMC RF process. The PN of 4.5mA VCO is about -82dBc/Hz@10K，-106dBc/Hz@100KHz, and -126dBc/Hz@1M. I want to improve PN, but found it's very hard. So, Could you please tell me if I can get better PN no increasing current? thanks a lot and waiting for your reply!
  3. E

    Is Kvco frequency dependant in VCO modeling?

    about VCO modeling do you mean that when resonance frequency changes, the Kvco will change too ?
  4. E

    How to determine the L of a design

    use small L when you want to reduce the flick-noise
  5. E

    your advice on increasing Q value of CMOS inductor

    hi everyone here, would you please give some advice on increasing Q value of CMOS inductor ? any idea is welcome, thanks!
  6. E

    What's the sensitivity of VCO and how to simulate it?

    Re: sensitivity of VCO the explain by biff44 is very great! thanks to biff44. to decide the sensitivity of VCO, you can set up a PLL loop noise model to see the effect of different KVCO.
  7. E

    about spectre simulator

    yes, I also found there might be error about input referred noise when you simulating PPF's noise
  8. E

    are there problems in this layout?

    it may increase the series resistance and parasitic cap. if your working frequency isn't very high, I think it's ok!
  9. E

    Why the Q of the inductor in the TSMC .18u technology is so small?

    design the LC VCO in my mind,about the process of TSMC 0.18um RF technology, Q value of inductor is near to 10.
  10. E

    What parameters are needed for an oscillator?

    oscillator? you can try another "open" point and architecture
  11. E

    Can I drive a 2W speaker with a 2W capability audio power amplifier?

    audio amp you can find some information from internet search
  12. E

    how to calculate PLL spur both integer and fractional ?

    calculate pll not phase noise, it's spurious level
  13. E

    How to simulate a LC VCO?

    Re: VCO design you can get the help from cadence document. Added after 3 minutes: hi, khouly, Could you please tell us how to simulate pushing and pulling? I never do that before. thanks a lot!
  14. E

    can pss simulation predict oscillation of circuits?

    why we need oscillator I am not sure about it. In my view, PSS is for large signal simulation.
  15. E

    how to calculate PLL spur both integer and fractional ?

    pll spur hi, eveyone, I'm trying to calculate PLL spur both integer N and fractional N. Could you please give some advice ? Thank you very much!
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