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DS90UB954 POC layout 阻抗控制

Hi TI 专家:

        当DS90UB954使用POC的功能时,手册中规范了几点layout的要求,其中有一点是阻抗控制:“Use coupled 100-Ω differential signal traces from the device pins to the AC-coupling caps. Use 50-Ω single ended traces from the AC-coupling capacitors to the connector”。请问为什么要在AC电容两端采用不同的阻抗控制?能不能在电容两侧都是50-欧姆单端走线?

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