A Hybrid Circuit with High Isolation for a Two-Wire Full Duplex Cable Modem to Adapt to Variations in Line Impedance

概要

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A high isolation hybrid circuit composed of a pair of transformers, a voltage control resistance (VCR) circuit and an automatic impedance control device is designed for a twowire full duplex cable modem to adapt variable line impedance. A binary frequency shift keying (BFSK) cable modem using the new hybrid circuit with an isolation of 52dB to 58dB in the line impedance variation range of 400 to 950 ohm is demonstrated. The isolation of the new hybrid circuit is increased by more than 30dB over the traditional hybrid circuit for a two-wire full duplex modem in the preset line impedance range.
社団法人電子情報通信学会の論文
2002-01-01