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[求助]THS4131单端转差分接ADS1263采集信号有额外低频干扰

Other Parts Discussed in Thread: ADS1263, THS4131

想用ADS1263采集+-10V范围的单独按信号

设计采用THS4131单端转差分电路配合GAIN=0.5,com=2.5V设计

将单独按信号调理成差分信号,并用ADS1263采集,THS4131电路如下图

ADS1263输入前端如下图,

测试将单端输入短接,

在ADS1263配置20sps fir滤波器时候采集正常,

因为我需要1k的采样率,适用sinc滤波器,采集的结果中存在周期信号,不知道是怎么回事,横坐标采样点数,纵坐标电压值

这个周期信号该怎么解决,我看有人说时因为THS4131输出震荡导致的,我调整了PCB铜皮还有推荐的GAIN阻值都没有效果,用SINC滤波器就会出这种问题

反而用fir滤波器没问题,但是采样率只有20sps,速度不够