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Frequency characteristics are somewhat equivalent to the load transient response, and so if an FRA cannot be used, an electronic load or the like can be employed to perform load transient response experiments for the expected load. When the phase margin is insufficient, ringing can be generated in the load transient response waveform to observe unstable waveforms. It is possible to determine whether waveforms are stable and whether phase compensation is properly performed. The application note at the following link should be consulted. Related Link : Technical Document