Patent ID: 7457405

Claim:
A DSL POTS splitter including an enhanced low pass filter, the enhanced low pass filter comprising: a first filter capacitor including a first lead and a second lead; a first non-isolated inductor including a first winding and a second winding; a second non-isolated inductor connected to the first non-isolated inductor and including a first winding and a second winding, the first winding of the second non-isolated inductor connected in series with the first winding of the first non-isolated inductor, the second winding of the second non-isolated inductor connected in series with the second winding of the first non-isolated inductor; an isolated inductor connected to the first non-isolated inductor and including a first winding and a second winding, the first winding of the isolated inductor connected in series with the first winding of the first non-isolated inductor and to the first lead of the first filter capacitor, the second winding of the isolated inductor connected in series with the second winding of the first non-isolated inductor and to the second lead of the first filter capacitor; and a common mode choke including a first winding and a second winding, the first winding of the common mode choke connected in series with the first winding of the first non-isolated inductor and with the first winding of the isolated inductor, the second winding of the common mode choke connected in series with the second winding of the first non-isolated inductor and with the second winding of the isolated inductor; wherein the first non-isolated inductor, the second non-isolated inductor, and the isolated inductor have physical sizes that are essentially the same; a combined inductance of the first and the second non-isolated inductors is essentially the same as an inductance of the isolated inductor; and a DC saturation current of the isolated inductor is lower than a DC saturation current jointly provided by the first and the second non-isolated inductors.