Galvanic isolation of signal circuits means absence of DC coupling between them, “circuit ground” and other supply buses. Upon availability of galvanic isolation the potential of signal circuits against “circuit ground” can be significant but it can’t exceed the isolation voltage acceptable for the current interface. Galvanic isolation can be achieved in different ways which validity depends on the requirements to the isolation voltage as well as on the characteristics of the interface signals.
Examples of galvanic isolation:
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