| 摘要 |
PURPOSE: An impedance matching circuit of a VDSL(Very high speed Digital Subscriber Line) line is provided, which can perform an impedance matching as well as can separate a transmission signal from a received signal using a cheap transformer. CONSTITUTION: A transformer part(T) comprises the first or the fourth transformer(T1-T4), and a winding ratio of each transformer is 1:1. The first line terminal(L1) is connected to the first terminal of the primary part, and the second terminal of the primary part of the second transformer(T2) is connected to one side of a condenser(C). The condenser blocks a low frequency by being interlocked with an inductance of the transformer. The other side of the condenser is connected to the first terminal of the secondary part of the fourth transformer(T4), and the second terminal of the secondary part of the fourth transformer is connected to the second line terminal(L2). |
