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Why there is no convergence in PSS and transient if I enable "Calculate initial conditions (ic) automatically"?

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Dear All,

I am simulating a LC VCO in PSS in Oscillator mode, and I encountered a no convergence problem if I enabled the  "Calculate initial conditions (ic) automatically" option:

But if I disable this option like the next image and give a initial condition through ADE L>Simulation>Convergence Aids>Initial Condition manually, PSS will convergence.

The same situation happened when I simulate transient analysis with "Calculate initial conditions (ic) automatically" enabled. And again there is no convergence problem if I set a initial condition by myself.

Could you tell me what's the difference between "Calculate initial conditions (ic) automatically" and set  initial condition through Convergence Aid by users? Is that reasonable if I disable "Calculate initial conditions (ic) automatically" and give initial condition through Convergence Aid?

Regards,

Clara.


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