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实测正向信号正常放大，电路采用正负5V电源供电，参考信号由TL431接跟随器提供+1.25V信号稳定，负电压输出恒为-2.26V，更改参考电位为0V时负电压输出变为-3.32V。第一次使用该芯片，请问下是什么问题
