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When the capacitance of an input ceramic capacitor has changed due to the DC bias characteristic, should the impedance characteristic be reexamined as well?
Attenuation of the capacitance due to the DC bias characteristic causes the resonance frequency and other impedance characteristics to change accordingly as well. The capacitor manufacturer should be asked for the impedance characteristics for DC biasing, and devices selected on this basis, or else a MLCC should be used with a high rated voltage and a value sufficient to accommodate drops in capacitance at the voltage of use due to the DC bias characteristic.