Common-mode signal: Difference between revisions

Revision as of 10:52, 16 February 2022

Revision as of 06:11, 27 February 2022

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==Methods of eliminating common-mode signals==

* [[Differential amplifier]]s or receivers that respond only to voltage differences, ''e.g.,'' those between the wires that constitute a pair. This method is particularly suited for instrumentation where signals are transmitted through DC bias.

* An inductor where a pair of signalling wires follow the same path through the inductor. E.g. in a [[bifilar winding]] configuration such as used in Ethernet magnetics.<ref>{{Cite web |url=http://pulseeng.com/products/datasheets/H325.pdf |title=Archived copy |access-date=2013-12-17 |archive-date=2016-03-04 |archive-url=https://web.archive.org/web/20160304000938/http://pulseeng.com/products/datasheets/H325.pdf |url-status=dead }}</ref> Useful for AC and DC signals, but will filter only higher frequency common-mode signals.

* A transformer, which is useful for AC signals only, and will filter any form of common-mode noise, but may be used in combination with a bifilar wound coil to eliminate capacitive coupling of higher frequency common-mode signals across the transformer. Used in twisted pair Ethernet.<ref>{{Cite web |url=http://pulseeng.com/products/datasheets/H325.pdf |title=Archived copy |access-date=2013-12-17 |archive-date=2016-03-04 |archive-url=https://web.archive.org/web/20160304000938/http://pulseeng.com/products/datasheets/H325.pdf |url-status=dead }}</ref>