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MLVDS总线,测试波形下冲较严重

Other Parts Discussed in Thread: SN65MLVD206B

如下波形所示,在进行MLVDS总线测试的时候,发现存在较大的下冲,甚至超过了阈值电压,阈值电压即为途中的两个坐标尺;分别在总线的两端并接了一个12pF和47pF的电容到地,和上拉电阻,均未解决问题,问下你们有碰到过这个问题吗?应该怎么解决的呢?