Re: stability analysis with step response and AC loop analys
Hello,
to me, I never see exception of this Bode digram theory
as long as the oscillation starts in small signal region.
What is needed here,
a closer and careful examination node by node
at what's really going on in the circuit near oscillation frequency.
one way to do might be,
try to open the loop, inject a small sinewave at osc. freq.
see does outcome voltage get amplified and its phase / waveform...