Berti
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Neil,
I agree with Stefan. The simulator will even find a stable operating point for a ring-oscillator constisting of CMOS inverters. However, in reality, this operating point won't be stable because of noise sources, and it will start to oscillate. Only initial condition can help to happen this in simulation. Nevertheless, you should take a carefull look at your circuit to make sure that this is really the case.
Regards
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