jeffyan
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hi, i think, you should make it clear to us that what is your transfer function related in your plot ? if it is Vop/Vip, then i think, the phase is right, because it >180 degree, which is needed for stable oscillation. if not, i think, you should check your ckt simulation, if the ckt work in its right operation, because it might be latched to two rail supplies. good luck jeff
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