| 摘要 |
An RF choke is understood to be used in the cable television ("CATV") systems to separate RF signals from the AC power signal, both of which initially co-exist when transmitted from the headend of the CATV system. The RF choke of the present invention, is modified by separating the predetermined number of turns from the winding adjacent to the "hot" (RF/AC) side of the RF choke in a CATV circuit. By evenly spreading these turns from each other with the purpose of reducing the series parasitic capacitance between the "hot" terminal and the rest of the choke. A useful parallel resonance at high frequency range in series with the rest of the choke is created. In addition, such a RF choke being connected (in shunt) to the RF signal path affects its performance to a much lesser degree than prior art chokes. Because of its reduced parasitic parameters, the choke of the present invention can be placed right at (or on) the AC/RF connector (terminal) of the PCB. This eliminates the oversized conductive trace that connected the CATV cable to the RF choke in prior art implementations. Thus, this placement reduces the parasitic parameter interference contributed by the now eliminated PCB conductive trace, which had to be sized to carry the AC signal of up to 25 Amps.
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