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Recent content by umberabbas

  1. U

    VCO Oscillation Frequency

    This the output I'm getting at 54 GHz. The value for L is 50pH and for that of the capacitor I'm not using any external ones so far but the capacitance should be 141fF as calculated from the equation.
  2. U

    VCO Oscillation Frequency

    Yes I'm designing a cross-coupled VCO at 60 GHz and the purpose is to achieve this frequency through voltage provided to LC. The thing is I'm achieving around 54 GHz and the output swing is skewed at some point. It is not a smooth sine-wave. The circuit is a cross-coupled VCO topology.
  3. U

    VCO Oscillation Frequency

    How to make the output swing of an LC VCO a smooth sinusoidal waveform? Any reference circuit? Also the VCO is not achieving it's intended frequency.
  4. U

    MOS varactors for High Frequency

    These MOS transistors can be tested like this or not? https://www.edaboard.com/showthread.php?t=373118
  5. U

    MOS varactors for High Frequency

    Yes it is for the differential VCO. I need to use these transistors as varactors in my VCO design. What changes need to be done to get certain results as mentioned. It's urgent :(
  6. U

    MOS varactors for High Frequency

    So I modified the test bench as shown below with the results attached. Is this the correct method for a MOS transistor to be tested as a MOS varactor? *The inductor value is 1pH. Here is the netlist ****************** DC Analysis `dcOp' ****************** Important parameter values...
  7. U

    MOS varactors for High Frequency

    Where I am doing it wrong? Please highlight it.
  8. U

    MOS varactors for High Frequency

    I am trying to characterize MOS varactors (NMOS) to get S-parameters along with the CV-curve for this circuit. However, I am not getting a suitable result. Please have a look and point out the mistake.
  9. U

    [SOLVED] Difference between the Schematics of MOS varactors

    Thank you a million times. You are a lifesaver :) :)
  10. U

    [SOLVED] Difference between the Schematics of MOS varactors

    I have labelled the schematic for more clarity. I hope this will be sufficient.
  11. U

    [SOLVED] Difference between the Schematics of MOS varactors

    Vcntrl and Vs both as 0.1 v. net03 is the gate to V node and net4 is the node of G to Vg. -------NETLIST---------- simulator lang=spectre global 0 parameters vcntrl=100m Vg=100m View name: schematic C1 (net4 net03 0) nvar_12rf w=(2u) l=(2u) ny=3 nx=3 m=1 Vg (net4 0) vsource dc=Vg mag=1m...
  12. U

    [SOLVED] Difference between the Schematics of MOS varactors

    Here it is.
  13. U

    [SOLVED] Difference between the Schematics of MOS varactors

    Please have a look and let me know whether I am doing it right or not.
  14. U

    [SOLVED] Difference between the Schematics of MOS varactors

    I want to use varactors to get the tuning curves but I am confused as to which varactor should be chosen among the available. Also, can the varactor type be identified by looking at the schematic? Attached is the figure for the reference. It's a NMOS varactor but is it a accumulation or an...
  15. U

    Microstrip Port Excitation

    These are the directions for E field vector (between strip and ground) and H field vector (around strip). Are these correct?
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