Patent ID: 6724219
Filing Date: 2004-04-20
Classification: H04L

Abstract:
A line driver for coupling a data transceiver to a transmission line having a load impedance via a transformer with a turns ratio of 1:n, said line driver comprising:an input port for receiving an input signal voltage from said data transceiver; an output port for supplying an output signal voltage to said transformer; and an amplifier circuit coupled with said input port, for amplifying said input signal voltage, said amplifier circuit including: a first output stage; a second output stage coupled to said output port; an output resistor coupled to said first output stage; a feedback path from said first output stage to an input of said amplifier circuit; and a line matching network coupled between said first output stage and said second output stage, for compensating variations in said load impedance, so that a synthesized output impedance of said line driver substantially matches an actual load impedance Z of the transmission line.