Patent ID: 6298037
Filing Date: 2001-10-02
Classification: H03H

Abstract:
An electronic filter adapted for receiving electrical signals transmitted by a data network and for passing low frequency components of the signals to a data receiving device, the electronic filter comprising:an input connector adapted for electrical connection to a complimentary output connector of an asymmetrical digital subscriber line, the input connector having an input voltage node for providing electrical input signals to the electronic filter;an output connector adapted for electrical connection to a complimentary input connector of a data receiving device, the output connector having an output voltage node for providing electrical output signals from the electronic filter; andan electrical signal processing path extending from the input voltage node to the output voltage node, electronic elements disposed along the electrical signal processing path, the electronic elements adapted to selectively pass frequency components of the electrical signals, frequency components below a predetermined comer frequency passing from the input connector to the output connector, frequency components above the predetermined comer frequency not passing from the input connector to the output connector;said electronic filter being a modular unit electrically connectable between the complimentary output connector and the complimentary input connector;said electronic filter having first, second, and third stages, said first, second, and third stages being connected in serial;said first, second, and third stages each having a corresponding high voltage side and a corresponding low voltage side;said first, second, and third stages each having an inductive transformer wherein a first winding of the transformer is connected to the high voltage side and a second winding of the transformer is connected to the low voltage side;said first, second, and third stages each having a capacitor connected across the high voltage side and the low voltage side;said second and third stages each having a capacitor connected across the first winding of the transformer connected to the high voltage side.