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THS4551的使用方法

Other Parts Discussed in Thread: THS4551

我使用THS4551来放大一个线圈感应信号,线圈感应信号的峰值是10mv,频率为1MHz,波形类似正弦波。参考了如下电路图:

我的电路中没有RS1和RT1,RG1和RG2都是180欧姆,VS+是5.06V,VS-接地,PD接VS+,VOCM悬空。没有信号输入时,OUT+是400mv,这是为什么啊?当我接上信号时,OUT+还是400mv,求解怎么解决,谢谢!