Continue
from last post, to solve the problem, we need to acknowledge that the buffer
circuit is in fact a feedback loop

To identify
which components belong to with block – refer to the blog

Let’s modify the schematic to perform bode plot analysis

1.
Ground non-inverting input – since op-amp input
is already high impedance – any voltage source with series resistance is pretty
much behaving just like a pure voltage source – for DC voltage source, it is
always a AC ground.

2.
Place large inductor, infinite AC coupling
capacitor and AC source, configure the AC source as below:

3.
Choose AC analysis:

4.
Your schematic should becomes:

5.
After simulation, you get

6.
But, how to interpret the plot?

Nice blog… Thanks for sharing very useful information about electrical circuits.

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