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Definition of "Differential Signaling" |
Most electrical signals are single-ended, comprised of a single wire and ground. Differential signals use two wires which are the inverse of each other -- when one swings positive, the other swings negative in equal magnitude. The receiving circuit looks only at the difference between the two, ignoring any common-mode voltage. This "push-pull" arrangement reduces the impact of electrical interference because external noise will affect both wires equally and the common-mode rejection will ignore the noise. Examples: RS-422, RS-485, professional audio signal standards (especially for microphones), the signal lines employed by Ethernet, and the standard twisted-pair analog telephone (POTS) line. Also see the tutorial, Understanding Common-Mode Signals. / Most electrical signals are single ended, comprised of a single wire and ground. Differential signals use two wires which are the inverse of each other when one swings positive, the other swings negative in equal magnitude. The receiving circuit looks only at the difference between the two, ignoring any common mode voltage. This "push pull" arrangement reduces the impact of electrical interference because external noise will affect both wires equally and the common mode rejection will ignore the noise. / Differential signaling is a method of transmitting information electrically with two complementary signals sent on two paired wires, called a differential pair. Since external interference tend to affect both wires together, and information is sent only by the difference between the wires, the technique improves resistance to electromagnetic noise compared with use of only one wire and an un-paired reference is ground. / The temperature coefficient is the relative change of a physical property when the temperature is changed by 1 Kelvin. |
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