Differential signal transmission

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Underlying technologySignal transmissionDifferential signal transmission


For symmetrical signalling (for detailed information, see Symb_Internet http://en.wikipedia.org/wiki/Differential_signaling the signal to be transmitted is turned into two complementary signals (+(A) and -(B)). The receiver creates the difference between the two signal levels which ideally represents the original signal.




Electromagnetic interference tends to affect both signal wires in the same way. Since the interferences at both ports of the receiver have no difference, they have no significant impact on the transmitted signal. The transmitted signal can be either analogue or digital (data signals).


Threshhold values are usually defined for differential signaling which represent the logical levels (high, low). (See for example: Symb_Internet http://en.wikipedia.org/wiki/Rs-422). The USB, Twisted Pair (Ethernet), RS-422 and RS-485 standards require differential signaling.



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