Common-mode signal: Difference between revisions

Revision as of 23:22, 5 November 2013

Revision as of 18:48, 17 December 2013

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* [[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. Eg in a [[bifilar winding]] configuration such as used in Ethernet magnetics.<ref>http://ww2.pulseeng.com/products/datasheets/H325.pdf</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>http://ww2.pulseeng.com/products/datasheets/H325.pdf</ref>

Common mode filtering may also be used to prevent egress of noise for electromagnetic compatibility purposes;