Patent ID: 6275581
Filing Date: 2001-08-14
Classification: H04M

Abstract:
A network interface circuit for providing voltage isolation and impedance matching between a network and equipment coupled to said network through said network interface circuit comprising:a receive data path coupling data from said network to said equipment;a transmit data path coupling data from said equipment to said network;a first CODEC coupled to said network in said receive data path;a first capacitive coupler coupled in said receive data path between said CODEC and said equipment;a second CODEC coupled to said network in said transmit data path;a second capacitive coupler coupled in said transmit data path between said CODEC and said equipment;a digital transfer function circuit coupled between said first capacitive coupler and said equipment;a digital summing circuit in said transmit data path coupled to add an output from said digital transfer function circuit to a transmit signal; andan extended feedback circuit coupled between said digital summing circuit and said digital transfer function circuit.