求高人指点,OPA847,sot23封装,正负5V供电,用来做带通滤波器,工作时温度能升高到50度左右,信号频率600K,刚一上电是信号正常,温度升高后发现信号也在衰减,附件较为电路原理图,请帮忙看看。
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