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. 2020 May 18;11:2479. doi: 10.1038/s41467-020-16262-0

Fig. 3. Output voltage spectrum of a buck/boost converter with PI-compensated output voltage control.

Fig. 3

The red components are the dc component, the switching frequency component and the high-order harmonics. fs denotes the switching frequency and fc denotes the cut-off frequency of the control loop. The dotted blue lines are the side-band components induced by the PI-compensated voltage control loop. They are distributed on both sides of the red components at frequency intervals equal to the cut-off frequency of the control loop.