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In general, the lower the capacitance of a ceramic capacitor, the higher is the self-resonant frequency, so that the device functions as a capacitor up to higher frequencies. There are mainly two types of frequency components in the switching operation of a DC/DC converter: the switching frequency (ranging from hundreds of kHz to several MHz), and the switching rise/fall frequency (from 100 MHz). In order to suppress power supply fluctuations at the latter in particular, 100 MHz and up, a ceramic capacitor with a low capacitance is necessary.