raja.cedt
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Dear Yuvan, When you have a feedback system with let's say -180 phase at low frequency, you would think that feedback signal reached summing node and it will add in phase with the input signal and again it will be amplified by the amp an so on, so while explaining we explain in serial manner but every thing happen in parallel in reality.Bottom line is we have introduced some "Verbal delay" in the system. But please note that time domain has no bug. Why don't you take a system like K*(1+S^2/(S^3) , use RH criterion to find it's stability condition.
Thanks, raj.
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