raja.cedt
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Add a dc current source with 0mA dc and 1A ac value. Run transient and note down the time period. Do a ac times sim over the time period. Now you can find ac voltage on that node over the period. You have voltage and current hence find the cap. Ps: cap corresponding to a node in ring oscillator varies over the period, for the oscillation frequency calculation, I would suggest use mid rail cap.
Best Regards, Raj.
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