DSL line interface having low-pass filter characteristic...

Details DSL line interface having low-pass filter characteristic... DSL line interface having low-pass filter characteristic...

2006-03-28

2006-03-28

Swerdlow, Daniel (Department: 2646)

Telephonic communications

Subscriber line or transmission line interface

Hybrid circuit

C379S391000

Reexamination Certificate

active

07020277

ABSTRACT:
A line interface couples a data transceiver to a transmission line via a transformer, the data transceiver transmitting signals in a first frequency range and receiving signals in a second frequency range. The line interface includes an input port for receiving an input signal voltage from an analog front end (AFE) chip, an output port, a line driver for amplifying the input signal voltage and supplying a transmit signal to the output port, a line port for sending the transmit signal and receiving a receive signal, termination resistors coupled between the output port and the line port, a receive signal port for supplying the receive signal to the AFE chip, a receive amplifier formed on the AFE chip coupled to the receive signal port, and a bridge network resistively coupling the line port and the output port to the receive signal port, the bridge network having a low-pass filter characteristic.

REFERENCES:
patent: 4034166 (1977-07-01), Hollis
patent: 4485277 (1984-11-01), Minch et al.
patent: 5479504 (1995-12-01), Nakano et al.
patent: 6542604 (2003-04-01), Blon et al.
patent: 6621346 (2003-09-01), Nabicht et al.
patent: 6681012 (2004-01-01), Gorcea et al.

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