EMC FLEX BLOG A site dedicated to Automotive EMC Testing for Electronic Modules

See Ground Return & Common Impedance Coupling

When two circuits share a common ground, the ground voltage of each one is affected by the ground current of the other circuit.

When two circuits share a common power supply, current drawn by one circuit affects the voltage at the other circuit.

Understanding the role of return ground is essential in EMC testing.

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See Differential Mode vs Common Mode Current