Broadband modem transformer hybird

Details Broadband modem transformer hybird Broadband modem transformer hybird

1998-03-04

2000-12-19

Chin, Stephen

Pulse or digital communications

Cable systems and components

375258, 333117, 333120, H04B 303

Patent

active

061635790

ABSTRACT:
A broadband modem hybrid transformer couples a broadband modem to a plain-old-telephone (POTs) line. The hybrid includes a full bridge having an impedance matching network to reduce the transhybrid attenuation of the hybrid. The second matching network(s) include various resistive and reactive components which together provide an impedance value selected based upon the impedance of the telephone line typically reflected into the primary windings of the transformer. The matching network increases the transhybrid attenuation of the hybrid, and thus reducing the amount of noise which couples from the modem transmit circuit to the modem receive circuit through the hybrid.

REFERENCES:
patent: 2499423 (1950-03-01), Selinger
patent: 3441684 (1969-04-01), McLeod
patent: 3517138 (1970-06-01), Burger
patent: 3711660 (1973-01-01), Cherry
patent: 4103118 (1978-07-01), Bergman
patent: 4238645 (1980-12-01), Burger
patent: 4677666 (1987-06-01), Herman
patent: 5528630 (1996-06-01), Ashley et al.
patent: 5581710 (1996-12-01), Noel, Jr. et al.

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