High quality factor (Q) planar spiral inductor based CATV diplexer and telephony module

A cable television diplexer and telephony module that can be employed in CATV data transmission systems to enhance performance levels and reduce manufacturing costs. The cable television diplexer and telephony module includes a printed circuit board substrate, and a diplexer having a low pass filter section and a high pass filter section, each of which has components mounted on the substrate. The respective low pass and high pass filter sections of the diplexer include one or more high Q value planar spiral inductors. Each spiral inductor includes a narrow track of metal disposed on the substrate and wound around a center to form a circular spiral curve having a plurality of turns. The spiral inductor may be fabricated on the substrate of the cable television diplexer and telephony module, or on a separate substrate, using a standard PCB fabrication process.