Many articles and application notes describe the extraction of phase margin, using a non-invasive technique that extracts the phase margin from an output impedance measurement.

Table 1. VM phase margin from Bode plots and output-impedance plots. Small-signal load-transient response Judging from the phase-margin values in Table 1, which are all above 50 deg., ringing is ...

You can see the video below. If you haven’t run into Bode plots before, they are simple plots of magnitude or phase vs. frequency, usually plotted on a log scale.

You can see the video below. If you haven’t run into Bode plots before, they are simple plots of magnitude or phase vs. frequency, usually plotted on a log scale.

The measured amplitude and phase (Bode plot) can be displayed at the same time for convenience, as displayed in Figure 2 with a simple check of the ‘Dual Plot’ button. Figure 2. Dual Bode plot derived ...

Read an introduction to this series in Part 1, and Part 2, which covers noise. This is the third and final part in a series which discusses how to properly test a power supply to ensure it will work ...