How to measure the phase shift using AC analysis?

[08Ultrasound]

Hi,

I have a simple RLC circuit consisting of no more than 4 components. If i hook up the network analyser function to the circuit and read the S11 values, i can see a change in the input impedance and a phase shift when i run it across a range of frequencies.

I am trying to do the same with the AC analysis tool. I've placed a probe on the positive input line. Using the AC analysis i've obtained the input impedance by using the expression mag(V(Probe1))/mag(I(Probe1)). Everything looks fine but i just can't seem to obtain the correct expression to gain the phase shift. All of the values i get out seem to flat line.

It would be great help if someone could point me in the right direction, as i'm running out of ideas.

Thanks for the help.

[Adam.B]

Hi 08Ultrasound,

You need to measure the voltage phase difference over a load as the voltage source is ideal so will always be in phase.