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Differential Signals Rules to
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2010-01-15
chenyucs
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We generally think of signals propagating through our
circuits 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 returns
through the ground system1
Differential mode involves a pair of traces (wires) between
the driver and receiver. We typically say that one trace
carries the positive signal and the other carries a negative signal
that is both equal to, and the opposite polarity from, the
first. Since the signals are equal and opposite, there is no return
signal through ground; what travels down one trace comes back on the other.
circuits 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 returns
through the ground system1
Differential mode involves a pair of traces (wires) between
the driver and receiver. We typically say that one trace
carries the positive signal and the other carries a negative signal
that is both equal to, and the opposite polarity from, the
first. Since the signals are equal and opposite, there is no return
signal through ground; what travels down one trace comes back on the other.
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