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使用OPA842搭建了一个跟随器电路，1MHz Vp-p=100mV正弦信号可以跟随。但当信号大于1MHz时开始衰减与手册带宽严重不符。
按手册建议的测试值试了一下，发现接入50欧姆的负载时运放带宽正常。疑惑？运放带宽与负载有这莫大关系吗？还有我这个设计是要求负载为1.2K的，有啥建议吗？
