Patent Number: 6,529,071

Title: xDSL feedback class C-AB driver

Abstract: The present invention is related to a Line driver for amplifying an input signal, said line driver comprising: a first input terminal (11) for receiving said input signal, a non-linear amplifier (3) connected to said input terminal (11) and arranged to provide a first output signal at a first output terminal (13), a digital to analogue converter (15) arranged to transform said input signal to an analogue input signal, an analogue linear amplifier (5) comprising a second (6) and a third input terminal (8) and a second output terminal (10), set up as a comparator between a first correction signal provided at said second input terminal (6) and a second correction signal provided at said third input terminal (8) and arranged to provide a second output signal at said second output terminal (10), combining means arranged to combine said first output signal and said second output signal to provide a total output signal to an output line (7), a first operational amplifier (12) configured to sense the current of said total output signal and arranged to provide a third output signal at fourth output terminal (16), said third output signal being based on said current and the impedance of the output line, and a second operational amplifier (14) arranged to subtract said third output signal from said analogue input signal to provide a fourth output signal, wherein said first correction signal is the total output signal and the second correction signal is said fourth output signal.

Inventors: Casier; Herman Joris (Kuurne, BE), Sevenhans; Joannes Mathilda Josephus (Brasschaat, BE), Moons; Elve Desiderius Jozef (Lummen, BE)

Assignee: Alcatel

International Classification: H03F 1/02 (20060101); H03F 1/34 (20060101); H03F 001/36 (); H03F 001/38 ()

Expiration Date: 03/04/2020