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关于超低功耗设计中 电容该怎么选型呢?

关于超低功耗设计中 电容该怎么选型呢?  比如电源管理模块的输入电容,是不是ESR越低越好呢?我现在有一颗电容 ESR=100m欧。输入电压5v.不知道合不合适?