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TL072IDAR放大器供电电压为+12V,-5v,输入0V,输出是1.6V,不能输出1.6V以下,是什么原因呢?

TL072IDAR放大器供电电压为+12V,-5v,输入0V,输出是1.6V,不能输出1.6V以下,是什么原因呢?