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FDC2214:测量电容,频率变化非常小

Part Number: FDC2214


电感感值为18μH,电容为33PF,外接传感器电容值在5-13PF,改变外部传感器的电容值,示波器测量出的频率变化非常小,这是为什么,需要调节那些参数?