Differential signals are generally used for high-speed and long-distance communication. On the one hand, the noise of * * * mode is reduced, on the other hand, the waveforms at the positive and negative ends are inverted, that is to say, the sum of the two waveforms is zero, and the interference to the external * * * mode is minimal.

? There are two methods to evaluate the differential signal with oscilloscope. One is to measure the jitter of the clock eye diagram according to the differential subtraction, and the other is to evaluate the two signal delays and external * * * mode interference by adding the differential signals.

Web page link of demonstration video of oscilloscope measuring differential signal