We generally think of signals propagating through ourcircuits in one of three modes, single-ended, differential mode,or common mode.Single ended mode is the mode we are most familiar with.It involves a single wire or trace between a driver and a receiver.The signal propagates down the trace and returnsthrough the ground system1Differential mode involves a pair of traces (wires) betweenthe driver and receiver. We typically say that one tracecarries the positive signal and the other carries a negative signalthat is both equal to, and the opposite polarity from, thefirst. Since the signals are equal and opposite, there is no returnsignal through ground; what travels down one trace comes back on the other.
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