本帖最后由 jobzjw 于 2011-9-13 13:09 编辑
图中：A1：Series impedance designed to avoid short circuiting of the High frequency high level data carrier by A part or B part capacitors to ground
B1：Transmission Matching impedance for high frequency signals (not required for low frequency narrow band transmission)
C1：Common mode rejection
D1：Capacitive Coupling circuit
请问：A1、B1两部分具体是如何起作用的。谢谢！
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