Friday, 25 September 2015

Ground connection in differential signals


Do I need a ground connection when connecting differential signals between two systems?


I was thinking this should not be needed, but how will common mode voltage at the receiving end behaves? Without connected the ground between the two systems, I probe the inputs at the receiving end and observe that the inputs rides on a 10V peak to peak 60Hz(probably interference from the power line). As there is a +/-5V common mode limit on the receiving input, this probably causes the erratic behavior that I'm now experiencing.


Will an earth connection at both systems help? Or a ground connection is still needed for connecting the differential signals?




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