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方案C是LVPECL driver和LVPECL receiver之间的AC耦合方式,靠近receiver端通过外部偏置使得满足recevier端共模输入电压范围。
OSCin和OSCin*连接外部晶振作为输入端,选择晶振时,频率满足输入频率范围,电压满足OSCin和OSCin*的输入电压标准(Figure11),所以无需外部进行偏置,而方案C中receiver端通过外部偏置目的是为了满足receiver端输入共模电压范围。