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LM2907应用

您好,在使用LM2907  14pin的器件时,11脚是否需要加二极管和上拉,作为偏置电压,用信号源输入时发现正弦波最低电压要低于-0.7V才有输出,请问是什么原因,主要是因为偏置电压造成的吗?