Method and apparatus for transmitting nrz data signals...

G - Physics – 06 – F

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G06F 13/40 (2006.01) H03M 5/18 (2006.01) H04L 25/49 (2006.01)

Patent

CA 2151373

The present invention provides a method and apparatus for transmitting NRZ data signals across an interface comprising an isolation barrier disposed between two devices interconnected via a bus. The apparatus comprises a signal differentiator for receiving an NRZ data signal and outputting a differentiated signal. A driver comprising a tri-state gate has as a first input the data signal and as a second input the differentiated signal for enabling the tri-state gate when the differentiated signal is high. A bias voltage is applied to an output of the tri-state gate to derive as output a transmission signal for transmission via the bus accross the interface between the two devices. In this way, the transmission signal output from the first device comprises an intermediate transmission signal corresponding to the bias voltage when the tri-state gate is disabled, a hight transmission signal when the tri- state gate is enabled and the first input to the tri-state gate is high, and a low transmission signal when the tri-state gate is enabled and the first input to the tri-state gate is low. A Schmidt trigger is provided as a receiver in the second device for receiving as input the transmission signal and outputting a reconstituted data signal corresponding to the synchronized data signal.

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