使用OPA657做TIA光电转换,后级用OPA847做交流放大,光电二极管使用的是铟化镓光电管,第一次打样的一批板子底噪正常,第二批板子自激振荡,把第一批和第二批板子上的OPA657芯片对调一下,结果相反,第二批的板子底噪正常,第一批板子自激振荡,请问OPA657有批次问题吗?
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