tumeda
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As your suggestion, I made a simulation without any initial setup, the circuit can not oscillate yet. But I have tried to set the initial voltages at another levels, for instance, 1V and 0.5V for two nodes, the circuit can oscillate now. But, a new problem comes up. I have set the transistor design parameters (W/L) in another values, the circuit cannot oscillate again, while there are also poles in right side. Who can tell me, is there any critiera for VCO oscillation?
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