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

Jeich MAR, Guan-Chiun CHEN, Ming-Yi LAN, Luo-Shing LUO

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Summary :

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 two-wire 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 52 dB to 58 dB 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 30 dB over the traditional hybrid circuit for a two-wire full duplex modem in the preset line impedance range.

Publication
IEICE TRANSACTIONS on Communications Vol.E85-B No.1 pp.352-354
Publication Date
2002/01/01
Publicized
Online ISSN
DOI
Type of Manuscript
LETTER
Category
Electromagnetic Compatibility(EMC)

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