it is just the result of a phase difference between input and output since the open loop gain can not be maintained. a mathematical abstraction out of the model used. it is of 'physical significance' only if you can use the op-amp in its out of range area for something unpredictably and marginally useful ;-)
First, thanks for helping me understand (finally) why the inverting op amp’s input impedance is assumed to be R1 no matter how high the actual op amp input impedance goes (eg something like TL07x). In terms of practical-ish implications, if I followed the algebra it seems like the input impedance will never be *lower* than R1?
I have a few videos in this ECE3400 where I use what I think's a special case of the Extra Element Theorem to analyze RC circuits. The EET would be worthy of a video of its own right (but to be honest I don't understand it very well at the moment, I'd need to do some studying).
@@Lantertronics I was reading Vorperian's book and found many interesting applications for it, but was feeling lost on some bits. I think your explanation style would really enlighten it.
it is just the result of a phase difference between input and output since the open loop gain can not be maintained. a mathematical abstraction out of the model used. it is of 'physical significance' only if you can use the op-amp in its out of range area for something unpredictably and marginally useful ;-)
My comment showed up in a Lantertronics video. I'm famous.
Nice yo see you prof.
Allo!
Following video, please describe how that imaginary L would change opamp behavior when add some capacitance to load (long cable wire, for example).
I do need to talk about capacitive loads and phase margin at some point...
First, thanks for helping me understand (finally) why the inverting op amp’s input impedance is assumed to be R1 no matter how high the actual op amp input impedance goes (eg something like TL07x). In terms of practical-ish implications, if I followed the algebra it seems like the input impedance will never be *lower* than R1?
In this case, yeah, R1 is like a lower bound.
Things change if you relax the assumption that the op amp itself has infinite input impedance.
Could you make some videos demonstrating the Extra Element Theorem for analysis?
I have a few videos in this ECE3400 where I use what I think's a special case of the Extra Element Theorem to analyze RC circuits. The EET would be worthy of a video of its own right (but to be honest I don't understand it very well at the moment, I'd need to do some studying).
@@Lantertronics I was reading Vorperian's book and found many interesting applications for it, but was feeling lost on some bits. I think your explanation style would really enlighten it.