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Renesas Electronics Europe - Knowledgebase

What causes noise generation?

Latest Updated:02/01/2008


What causes noise generation?


Noise is likely to be generated if the voltage or current heavily changes (in quantity and direction) per unit time. Therefore, high-power and high-frequency circuits may become a source of noise.
Noise is transferred via wiring such as power or ground wiring and signal wiring, or radiated into the air as electromagnetic waves (crosstalk).
Some sources that generate noise are the structure of the set and electrical characteristics of the circuit (such as current, operating speed, and inductance). Brush motors, relays and switches using an armature may generate surge noise (similar to lightning) by sparking, or power or ground noise. If the wiring on a board is at right angles or acute angles, noise could be emitted into the air.
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