How to build impedance over frequency bode plot (LTSpice)?
What is Impedance ?
As far as I know: Z = V/I

So if you fix I = 1 (Current source with AC = 1) and plot the voltage you plot V / 1 = ... ?

Aha V / 1 = V = Z !

This is how I simulate and plot the impedance over frequency of some DUT:





The magnitude will be the impedance
The phase you can also plot directly.

If this puzzles you: Imagine in the box there is only a 1 ohm resistor.
What would the plot be ?

Now a 10 ohms resistor...

Now a capacitor...

etc...