Coupling (electronics)

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In electronics, the principle of coupling refers to a signal coupling between two points. A distinction is made here:

Furthermore, there is a subdivision into a subcritical coupling and a supercritical coupling in the area of ​​coupling processes of high-frequency signals in which the coupling leads to an influence on the circular quality of the resonant circuits involved . In electronics, the strength of a coupling is specified using a coupling factor.

Coupling is used in a targeted manner in many technical applications, especially for signal transmission . Couplings, however, also often appear undesirable, where no mutual influence of independent conductors or signal channels is actually desired, e.g. B. in the earlier classic crosstalk between analog telephone lines, the network hum , between the two channels of a stereo system or neighboring radio channels . One speaks then z. B. from the coupling of an interference signal into the actual useful signal .

In modern digital technology this problem is generally significantly less than in analog technology . Especially in devices for measuring or amplifying very small analog signals ( millivolt range and below), e.g. B. with oscilloscopes or brain wave measurements , sometimes a lot of construction and equipment is required to minimize interference, for example by shielding .

Individual evidence

  1. wave coupling. German Society for EMV Technology, accessed on February 4, 2010 .
  2. wave coupling. Rittal, accessed on February 4, 2010 .
  3. High-frequency electromagnetic field (HF radiation influence). Rittal, accessed on February 4, 2010 .
  4. EMC of electrical drives (coupling through electromagnetic radiation). w-tech, accessed February 5, 2010 .