Patent ID: 6418220
Filing Date: 2002-07-09
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 &Sgr;/&Dgr; analog-to-digital converter coupled to said network in said receive data path; a first capacitive coupler coupled in said receive data path between said &Sgr;/&Dgr; analog-to-digital converter and said equipment wherein &Sgr;/&Dgr; modulated data crosses said first capacitive coupler; a &Sgr;/&Dgr; digital-to-analog converter coupled to said network in said transmit data path; and a second capacitive coupler coupled in said transmit data path between said &Sgr;/&Dgr; digital-to-analog converter and said equipment wherein &Sgr;/&Dgr; modulated data crosses said second capacitive coupler.