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THS3120输出范围一直是0到负电源之间???

电路就是照着同相放大接的,ref悬空时电压是0.02,ref接地,接负电源,正电源,都不能解决问题,输出状态仍然是0到-vcc之间,放大倍数是正常的,问题出在哪里呢?