Line driver for asymmetric digital subscriber line system

Details Line driver for asymmetric digital subscriber line system Line driver for asymmetric digital subscriber line system

2005-11-29

2005-11-29

Liu, Shuwang (Department: 2634)

Pulse or digital communications

Cable systems and components

C375S219000, C375S220000, C375S258000, C370S321000, C370S470000

Reexamination Certificate

active

06970515

ABSTRACT:
A line driver couples a data transceiver to a transmission line having a load impedance Z via a transformer with a turns ratio of 1:n, the data transceiver transmitting signals in a first frequency range and receiving signals in a second frequency range different from the first frequency range. The line driver includes an input port for receiving an input signal voltage, an output port for supplying an output signal voltage to the transformer, and a differential amplifier having a low pass filter for amplifying the input signal voltage and outputting an amplified signal voltage. The line driver further includes termination resistors having a resistance Rt, whereRt=Z2⁢n2×k(0<k≤1),and a positive feedback path for coupling the output signal voltage from the output port to an appropriate node of the differential amplifier so that a synthesized output impedance substantially matches the load impedance Z over the second frequency range.

REFERENCES:
patent: 6218872 (2001-04-01), Koren
patent: 6359505 (2002-03-01), Joffe
patent: 6411136 (2002-06-01), Nianxiong et al.
patent: 6580286 (2003-06-01), Tennen
patent: 6788745 (2004-09-01), Lim et al.
patent: 6801621 (2004-10-01), Tennen et al.
Regan, Tim, “ADSL Line Driver Design Guide, Part 2”, printed from http://www/linear.com/ezone/dsl2.html, on May 30, 2001.

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