Enhanced low pass filter

Details Enhanced low pass filter Enhanced low pass filter

2005-01-28

2008-11-25

Pham, Tuan (Department: 2618)

Telephonic communications

Subscriber line or transmission line interface

C379S390020, C379S391000, C379S402000, C379S413030

Reexamination Certificate

active

07457405

ABSTRACT:
An ADSL POTS splitter includes low pass filter. The low pass filter includes a first inductor portion in communication with the line interface and a second inductor portion isolated from the line interface via an isolation capacitor. In one embodiment, the first inductor portion is characterized for non-saturation in conventional operating ranges. The first non-isolated inductor portion has a respective DC saturation current and the isolated inductor portion has a respective DC saturation current. The DC saturation current of the first non-isolated inductor portion is substantially greater than the DC saturation current of the isolated inductor portion for achieving higher inductance in the isolated inductor portion.

REFERENCES:
patent: 6137880 (2000-10-01), Bella
patent: 6473507 (2002-10-01), Eckert
patent: 2003/0002303 (2003-01-01), Riggio et al.

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