Patent ID: 6215431
Filing Date: 2001-04-10
Classification: H03H,H03M

Abstract:
An ADSL transmission system comprising:a digital DMT generating modulation circuit that generates a DMT modulated digital output;a digital to analog converter that converts the DMT modulated digital output into a DMT analog signal;a discrete pulse generating circuit that samples the DMT analog signal, the discrete pulse generating circuit outputting a pulsed output signal;an amplifier having an input coupled to the output of said discrete pulse generating circuit and outputting an amplified pulsed output signal, wherein said amplifier includes a feedback loop coupled between the input of said amplifier and an output of said amplifier;a reconstruction filter that is driven by the amplified pulsed output signal wherein the reconstruction filter outputs a line driving signal that is suitable to drive an ADSL communication line;whereby a line driving signal is produced that reduces distortion caused by imperfections in the digital to analog converter.