Just need a little push in the right direction.

We have to design a third order high pass filter, which I've calculated all resistors and caps for. We had to use 2 x LM108 IC's, which I understand makes the circuit less than ideal.

Using my theoretical pole positions, I need to plot magnitude and phase and group delay. This should be a bode plot, correct?

So I need to calculate a transfer function (which should be a stage 1 TF multiplied by a stage 2 TF) to plot this in matlab. correct?

I've calculated first stage cutoff freq, second stage cutoff freq and ς, so I should be able to use the attached formula, correct?

Or is there an easier way to do this?

Any pointers would be great, thanks!