VCO Loop gain simulation

Discussion in 'Cadence' started by Eric, Jun 27, 2010.

  1. Eric

    Eric Guest

    Hi,

    is there application note or an explanation on how can we measure
    VCO's loop gain using the CMDMProbe?

    B.R
     
    Eric, Jun 27, 2010
    #1
  2. Eric

    Mobil Guest

    I'm thinking of that using a port to measure the negative resistance
    (like real(Z)) would be simple.
     
    Mobil, Jun 30, 2010
    #2
  3. Eric

    Andrew Beckett Guest

    Eric wrote, on 06/27/10 09:52:
    Look in
    <MMSIMinstDir>/tools/spectre/examples/SpectreRF_workshop/SpectreRF_AN/PstbAN.pdf

    This talks about using pstb versus stb for stability analysis of a VCO. Using
    cmdmprobe for differential stability (rather than single-ended stability) is no
    different than from non-periodic analyses. You can only use it for balanced
    loops (i.e. no significant CM->DM or DM->CM leakage) and it can measure either
    common-mode or differential-mode stability based on a parameter on the cmdmprobe
    instance (there's a solution on Cadence Online Support for this, I'm sure).

    Regards,

    Andrew.
     
    Andrew Beckett, Jul 12, 2010
    #3
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