I'm having trouble finding the phase margin the telescopic cascode amplifier I'm currently building.
This source says that the phase margin for an inverting amplifier is the distance from -360 degrees at unity gain frequency and in general is:
$$PM = \text{180}-|\angle_{\text{change from normal operating point}}|$$
Is this the formula we should use or am I misinterpreting what they're saying? Below is the bode plot for my amplifier. According to the source my phase margin should be roughly 60 degrees but if that's not the case then my amplifier is likely unstable.