ashrafsazid
Advanced Member level 4
Hi,
I am confused about the phase shift at DC for the stb analysis of a Class AB op amp shown in figure below. Please note the input and output polarity.
I put the op amp in negative feedback as inverting configuration below
If I do the DC sweep with same R value (R1 = R_fb = 10k) the dc output sweep is expected, shown below
But, If I do stb analysis I see that at DC the phase shift is around 0, figure below
I expect 180 degree phase shift at the beginning of DC, not sure why I am not getting that. anybody could explain please? FYI, I also get the transient behavior as expected.
Thanks in advance.
I am confused about the phase shift at DC for the stb analysis of a Class AB op amp shown in figure below. Please note the input and output polarity.
I put the op amp in negative feedback as inverting configuration below
If I do the DC sweep with same R value (R1 = R_fb = 10k) the dc output sweep is expected, shown below
But, If I do stb analysis I see that at DC the phase shift is around 0, figure below
I expect 180 degree phase shift at the beginning of DC, not sure why I am not getting that. anybody could explain please? FYI, I also get the transient behavior as expected.
Thanks in advance.