I can't understand your question correctly.
Visjnoe wrote on Feb 12th, 2009, 12:53am:I do however not see the physical mechanism behind this, since to my opinion, the losses in the circuit are the same (in startup versus steady-state).
There could be two solutions as steady state solutions where "negative impedance"+"loss impedance"=0.
One is an oscillation, the other is non oscillation, that is, static state.
Autonomous HB analysis can find this steady state oscillation solution without any start up for oscillation.
For example, autonomous HB analysis can give oscillation solution for X'tal OSC having very High Q without any startup.
But it requires very accurate oscillation frequency as initial guess.
Old HB analysis which didn't have transient assisted ability required special oscillator probe for Autonomous HB analysis.
For example, Agilent MDS required this special oscillator probe.
Even in Agilent ADS, this special oscillator probe has remained as option.
But there are cases where it can't find oscillation solution for this pure frequency domain technique.
Current HB analyses have transient assisted ability to get good initial guess for oscillation, here start up for oscillation is used.
And it doesn't require special oscillator probe.
Again see the following to your previous post.
http://www.designers-guide.org/Forum/YaBB.pl?num=1216380172/7#7http://www.designers-guide.org/Forum/YaBB.pl?num=1216380172/13#13