Adaptive cancellation bridge circuit

Details Adaptive cancellation bridge circuit Adaptive cancellation bridge circuit

1985-04-22

1987-06-02

Olms, Douglas W.

Multiplex communications

Wide area network

Packet switching

370 32, 375 14, 379402, H04L 514, B60K 3100

Patent

active

046708707

ABSTRACT:
The invention relates to an adaptive cancellation bridge circuit (ACB) for use in a single medium full duplex line termination equipment such as modems where signals are transmitted and received simultaneously along a pair of wires, the transmit and receive signal being separated in frequency. The bridge comprises a bridge network including transconductance cells (TC1, TC2 and TC3), to provide resistive, capacitive, and inductive components and these cells are electronically controlled by a current control device CC driven from a received signal (RXS) inphase and quadrature components to adjust the bridge network so that it becomes balanced and cancels a transmit signal (TXB) completely.

REFERENCES:
patent: 3781720 (1973-12-01), Mueller
patent: 4074087 (1978-02-01), Blake, Jr. et al.
patent: 4355214 (1982-10-01), Levy et al.
patent: 4389727 (1983-06-01), Rouffet

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