Simultaneous bidirectional transceiver

Details Simultaneous bidirectional transceiver Simultaneous bidirectional transceiver

1991-05-24

1993-06-01

Olms, Douglas W.

Multiplex communications

Wide area network

Packet switching

370 851, 375 7, H04L 514, H04B 303

Patent

active

052166678

ABSTRACT:
A digital data transceiver comprises a conventional push-pull driver and a novel receiver. The transceiver can drive data to and simultaneously receive data from a transceiver of like kind via the same communication line. A series resistor is situated between the driver's output and the communication line. The resistor has equivalent resistance to the characteristic impedance of the line in order to prevent undesirable reflections on the line. In the receiver, the driver's output is divided in half by a resistor voltage divider for input to a differential current mechanism. The differential current mechanism has a differential current switch and a feedback circuit. The differential current switch compares the signal levels at both ends of the series resistor to derive an output for the receiver. The feedback circuit provides feedback to the differential current switch to increase the noise margin.

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A. Y. Chang and P. J. Pandya, "Simultaneous Bidirectional Transceiver Circuit," IBM Technical Disclosure Bulletin, vol. 23, No. 4, pp. 1435-1427, Sep. 1980.

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