Question about a warning message in PSS+PNOISE simulation for LC VCO

Discussion in 'Cadence' started by cmhsuitri, May 9, 2006.

  1. cmhsuitri

    cmhsuitri Guest

    Hi all,

    I am designing a LC VCO and is simulating it's phase noise by Spectre
    RF. Simulation went well until I replaced the ideal capacitors in my
    circuit with MIM capacitors plus MOS
    switches to achieve band-switching.

    I sometimes get the warning message "During PNoise analysis, 'pnoise'
    relative residual of linear system is significantly above tolerance.
    Results may be inaccurate". Although the simulation is finished, and
    results seem reasonable, I am not sure if I can trust the number due to
    this warning.

    Could someone please explain the meaning of this warning and how to
    solve it? I appreciate your help.

    cmhsuitri, May 9, 2006
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