Differential signalling - definition
Differential signalling - definition
Differential signalling is a method of transmitting electrical signals in which information is carried as a potential difference between two conducting lines, rather than relative to a common ground or reference point. This technique significantly improves immunity to electromagnetic interference and allows data to be transmitted over longer distances with greater signal integrity. It is widely used in digital and analogue transmission systems, especially where high reliability and precision are required.
In a differential circuit, the two signal lines carry the same information but with opposite polarity - when one line reaches a high state, the other assumes a low state, and vice versa. The receiver reads the voltage difference between these lines, ignoring common interference that could occur on both cables simultaneously. This makes it possible to eliminate common-mode noise, making this method extremely resistant to the external environment.
Differential signalling is used in communication standards such as RS-485, CAN, USB, HDMI or LVDS, where fast and stable data transmission is important. It makes it possible to reduce electromagnetic emissions, which is important in the design of circuits compliant with EMC standards. In digital and industrial electronics, this method allows signal integrity to be maintained even in the presence of interference, large ground potential differences or long transmission cables.
From a design point of view, differential signalling requires the use of suitable differential controllers and receivers, as well as the correct routing of cable pairs - maintaining symmetry and minimising interference loops - which affects the stability of transmission parameters.
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