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DLP3021-Q1: 高速信号阻抗匹配

Part Number: DLP3021-Q1


你好,请问在提供的原理图设计中,3021芯片信号端串联了20Ω的电阻,要求匹配单端阻抗50Ω,串联20Ω的原因是因为信号源内阻有大概30Ω吗?如果不是,请问这个信号线上的电阻该如何匹配?