140NOE77111
140NOE77111
140NOE77111
Q4:带宽是否越高越好?
A:前面提到，目前广泛使用的电路板、连接器、电缆和集成模块的上升时间非常有限，以至于高速信号经过传输之后高频分量损耗严重。许多新的第三代标准(USB3.0,PCIEGen3,10G-KR)已经考虑到这一点，要求的带宽比以前低得多。当然，也有一些例外情况，要求更高的带宽。比如100G以太网方案，它采用复杂的调制技术(DP-QPSK)，要求四个模拟输入及过20GHz的带宽进行分析。鉴于这些应用，泰克已经宣布，其带宽过30GHz的示波器将于今年下半年晚些时候推出。
Q5:怎样才能提高测试仪器的灵敏度呢?
A:选择合适的带宽，带宽过大会增加噪声，在垂直设置上，尽可能让信号填满屏幕，好充分利用示波器的AD位数，可以采用波形平均，合适的探头的带宽，选择高分辨率(Hi-res)采集模式等等。
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