Line interface system

Pulse or digital communications – Transceivers – Transmission interface between two stations or terminals

Reexamination Certificate

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Details

C375S222000, C375S297000, C375S318000

Reexamination Certificate

active

10787652

ABSTRACT:
A transceiver system is disclosed for use in a telecommunication system. The transceiver system includes a transmission circuit with a differential transmitter input coupled via a transmitter input stage to a differential input of a transmission amplifier in an embodiment. The transmitter input stage includes a trimmable resistor, one end of which is coupled to a positive transmit input signal, and the other end of which is coupled to a negative transmit input signal. The transceiver system also includes a receiver circuit with a differential receiver output coupled to a differential input of a receiver amplifier, and further includes a transmission line interface circuit coupled to a differential output of said transmission amplifier and to a differential input of said receiver amplifier. In accordance with other embodiments, the receiver amplifier includes an input stage that includes a first plurality of capacitors and a feedback circuit that includes a second plurality of capacitors.

REFERENCES:
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patent: 5105163 (1992-04-01), Voorman
patent: 5699016 (1997-12-01), Federspiel et al.
patent: 6356582 (2002-03-01), Mazer et al.
patent: 6459323 (2002-10-01), Birkeli
patent: 6903593 (2005-06-01), Wang
patent: 2002/0151280 (2002-10-01), Sabouri et al.
patent: 2003/0109239 (2003-06-01), Sabouri et al.
patent: 1111865 (2001-06-01), None
“A 740mW ADSL Line Driver for Central Office with 75dB MTPR,” Sabouri et al.,Solid-State Circuits Conferencevol. 1, pp. 322-470 (2002).

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