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您好,请教关于INA128的问题

Other Parts Discussed in Thread: INA128

您好,我们做了一个扭矩测量仪,仪表运放选择的是INA128,电路结构跟芯片资料中的-Figure 4. Bridge Amplifier-相似,只不过用的的是正负电源,正常情况下工作正常,但是当我们在紧靠测试仪的地方打手机时,显示结果不正常,然后我们用示波器观察,发现当打手机时,有明显的干扰出现在INA128的输出端,然后我们加了铝屏蔽盒发现让然有干扰,想问下出现这种情况是什么原因?谢谢