PCB 板上的高速信号特征：XAUI 接口3.125GBd 串行差分信号：60ps，请问需要 多高带宽的示波器才能精确测量？测量误差可达多少？

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对 XAUI 接口 3.125GBd 串行差分信号，听起来有点象 InfiniBand 信号，用正弦内插的 方式，或类似等效采样的方式来采集，但由于本身带宽和触发抖动等因素，在其测量 100ps ~ 130ps 范围内的上升时间时，采用 7GHz 差分探头可保证误差《3%，对于《 80ps 的上升时 间测量，其误差会大于 10%， 虽然这已经是实时示波器中最好的方案，单就上升时间测量而 言，最精确的方案是安捷伦的网络分析仪（需配上物理层分析软件），因为其带宽可高达 50GH z。