When gain =0db and phase >180 G(S)*H(s) ≠8800; -1 and 1+ G(S)*H(s)≠8800;0
:arrow:not a pole of the close loop Transfer function
?When |LT(s)| =0db and phase >180 LT(s) not equal to -1
tyassin said:Hi
Sure you are right, but it seems that the Bode plot method sometimes is not enough to evaluate a system. Especially for the kind you have, where the phase go beyond the 180 degrees and amplitude response is also larger than 1.
vovan76 said:If Bode stability analysis not always can give answer ,
how I can check stability in real life ,i.e. if i should check stability to real system (BG,LDO ) and i don't know all poles and zeros ( placement of the poles and zeros can change due to corners, temperatures ,load changes ...)
Till now i open loop with iprobe from Candence library and phase margin
but if i have not regular Bode plot(for example phase cross 180 not one time)
what i should do?
I don't think that Nyquist is appropriated for real system
sutapanaki said:......................
And BTW, usually we call Aβ not the open-loop gain but just the loop gain.
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