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Lets discuss ground bounce with the help of circuit below.
In the the circuit above the conductor 2 is connected to ground rail and expected voltage across the conductor is 0V. But in real circuits the conductor 2 itself has inductance. This inductance results in voltage (ground bounce) when current flows across the conductor. The unintended voltage or ground bounce can propagate to circuits and can cause issues.
Steps to reduce ground bounce in circuits.
1. Decrease the inductance of conductor 2.
2. Increase isolation capacitance.