Common-mode signal: Difference between revisions

Revision as of 06:12, 27 February 2022

Revision as of 05:49, 14 March 2022

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High frequency common-mode signals, for example, [[Radio frequency|RF]] noise from a computing circuit, may be blocked using a ferrite bead clamped to the outside of a cable. These are often observable on laptop computer power supplies near the jack socket, and good quality mouse or printer USB cables and HDMI cables.<ref>{{Cite web |url=http://www.elmac.co.uk/pdfs/ferrite.pdf |title=Archived copy |access-date=2013-05-07 |archive-url=https://web.archive.org/web/20120706223753/http://www.elmac.co.uk/pdfs/ferrite.pdf |archive-date=2012-07-06 |url-status=dead }}</ref>

[[Switched-mode power supply|Switch mode power supplies]] include common and differential mode filtering inductors to block the switching signal noise returning into mains wiring.<ref>http://www.hottconsultants.com/pdf_files/APEC-2002.pdf {{Bare URL PDF|date=March 2022}}</ref>

[[Common-mode rejection ratio]] is a measure of how well a circuit eliminates common-mode interference.