Infineon Technologies Ag

Lantiq Deutschland Gmbh

Lantiq Beteiligungs Gmbh & Co. Kg

Torbjörn Randahl

Lars Karlsson

Jörg Hauptmann

Bo Bokinge

Karl Stefan Barkarö

Stefan Barkarö

Karl-Mikael Johanson

Carl-Mikael Johansson

In a line driver/receiver circuit where the line driver is connected with its output terminals to a load for supplying a transmit signal thereto and where the receiver is connected with its input terminals to the load for simultaneously receiving a receive signal therefrom, the transmit signal on the input terminals of the receiver is canceled by connecting the output terminals of the line driver to the load via equal complex sense impedances of an impedance value that is much smaller than the impedance value of the load impedance to match the load impedance, connecting the input terminals of the receiver to the load via equal first resistors and to respective output terminal of the line driver via equal second resistors, and providing transconductance amplifiers to sense the voltage across the sense impedances and supply corresponding currents to respective input terminal of the line driver.

Echo canceling arrangement

at least one self oscillating loop circuit which oscillates with a switching frequency (f), wherein the self oscillating loop circuit () comprises an output driver () which is switched with said switching frequency and a loop filter () which feeds back an amplified loop signal output by said driver () to an input of said self oscillating loop and a trimming circuit () for trimming the switching frequency (fs) of said self oscillating loop circuit.

xDSL-line-interface-circuit

Growing community of inventors

Nacka, Sweden

Torbjörn Randahl