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例如，驱动器内阻为20欧，理论上采用驱动端串联30欧电阻，与50欧特征阻抗的传输线进行匹配，但是从驱动端到串联电阻之间的这一段走线应该走成多少阻抗呢？
单端信号一般就按50ohm特征阻抗走线，差分信号一般按100ohm阻抗走线。
你的这种情况，如果不是什么高速信号，问题应该不大。
