Controlled inductance device and method

A DSL filter circuit specifically adapted to comply with the requirements of an electrical performance standard, comprising:

• at least one shielded inductive device comprising:
• a substantially cylindrical core;
• at least one winding disposed substantially around said core;
• a shield cap adapted to cover substantially all of said at least one winding and said core;
• and
• at least one inductance control element;
• wherein said device provides at least first and second inductance values corresponding to first and second predetermined notch frequencies.

A DSL filter circuit specifically adapted to comply with the requirements of an electrical performance standard, comprising:

• at least one shielded inductive device comprising:
• a substantially cylindrical core;
• at least one winding disposed substantially around said core;
• a shield cap adapted to cover substantially all of said at least one winding and said core;
• and
• at least one inductance control element;
• wherein said device provides an enhanced inductance and reduced notch frequency in a predetermined portion of the inductance profile of said circuit.

An inductive device, comprising:

• a magnetically permeable and substantially drum-shaped core having at least one spool region and at least first and second end elements proximate to said spool region;
• a controlled saturation element cooperating with said core to provide said inductive device with a desired inductance characteristic, wherein said controlled saturation element comprises a substantially continuous sheet of alloy disposed at least partly around the peripheries of both said first and second end elements;
• and
• at least one shroud disposed around at least a portion of said sheet, said at least one shroud adapted to maintain said sheet and said core in substantially fixed relationship.

A DSL filter circuit, comprising:

• an inductive device having a magnetically permeable and substantially drum-shaped core having at least one spool region and at least first and second end elements proximate said spool region;
• a controlled saturation element cooperating with said core to provide said inductive device with a desired inductance characteristic, wherein said controlled saturation element comprises a substantially continuous layer of alloy disposed at least partly around the peripheries of both said first and second end elements;
• at least one shroud disposed around at least a portion of said layer, said at least one shroud adapted to maintain said layer and said core in substantially fixed relationship;
• and
• a dynamic filter circuit;
• wherein said inductive device and said filter circuit cooperate to provide an on-hook impedance of a first value, and off-hook impedance of a second value, said second value being lower than said first value.

An inductive device, comprising:

• at least one magnetically permeable and substantially drum-shaped core means having at least one spool region and at least first and second raised elements proximate said spool region;
• at least one means for conducting electrical current disposed proximate to said core means;
• at least one means for controlling saturation of said core means, said means for controlling cooperating with said core means to provide said inductive device with a substantially stepped inductance characteristic, said means for controlling further comprising a substantially continuous layer of alloy disposed at least partly around the peripheries of both said first and second raised elements;
• and
• at least one shrouding means disposed around at least a portion of said sheet of alloy, said at least one shrouding means adapted to maintain said sheet and said core means in a substantially fixed relationship.

A DSL filter circuit specifically adapted to comply with the requirements of an electrical performance standard, comprising:

• at least one shielded inductive device comprising:
• a magnetically permeable and substantially drum-shaped core having at least one spool region and at least first and second elements proximate said spool region;
• a controlled saturation element cooperating with said core to provide said inductive device with a desired inductance characteristic, wherein said controlled saturation element comprises a layer of alloy disposed at least partly around the peripheries of both said first and second end elements;
• and
• at least one cap element disposed around at least a portion of said layer, said at least one cap element adapted to maintain said layer and said core in substantially fixed relationship;
• wherein said device provides at least first and second inductance values corresponding to first and second predetermined notch frequencies.