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AC coupling is the use of a special circuit to remove the static (dc) components from the input signal to the amplifier in an instrument, leaving only the components of the signal that vary with time.
Crosstalk is the unwanted "leaking" of a signal from a wire (or trace) to another adjacent wire (or trace), usually by magnetic induction. This is usually viewed to be detrimental to signal integrity, because the undesired signal that was induced to the adjacent wire corrupts the real signal in that wire. One way to prevent this is to shield the wires and to twist both wires around each other (to minimize magnetic induction).
Crosstalk: A disturbance, caused by electromagnetic interference, along a circuit or a cable pair. A telecommunication signal disrupts a signal in an adjacent circuit and can cause the signals to become confused and cross over each other.
AC Coupling: The use of a special circuit to remove the static (dc) components from the input signal to the amplifier in an instrument, leaving only the components of the signal that vary with time.
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