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咨询自适应信号放大的问题

       测量对象为闪电电场的感应电压,感应信号在正负几十到几百毫伏期间,对于前端信号的放大,如果增益过大的话,放大后信号可能饱和或者超出AD的量程,如果增益设置过小的话,不利于小信号的测量!

      每次电场信号的幅度是随机的,所以电路的增益设置挺麻烦!每次几百个闪电的电场信号有一大半的都浪费了,不是饱和了就是 测量效果不好!

      信号带宽在10M内,如果采集速度在1-5M内,求教有无好的增益设置方案?最好是能根据信号的大小设置增益最好