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本人使用差分输入,单端输出ina331和opa690做一个两级放大电路,频率为10k到1M,第一级放大5倍,第二级放大20倍,按道理带宽是够用的,低频的时候都正常,可是在1M的时候,衰减太大了,正常输出为2V,而且波形也不好想问下原因是什么,是因为两级运放的阻抗匹配没有做好吗 那么波形变化的原因是??

Other Parts Discussed in Thread: OPA690, INA331