VCC Decoupling and Bypassing

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  Many high frequency radiated emissions are caused by poor power decoupling. While everyone intuitively understands that high speed signals cause EMI, some forget about the power perturbation. Whenever a digital circuit switches, it also consumes current at the switching rate. These pluses of power current will radiated just as effectively as pulses of signal current. In fact, they often cause more radiation, since the power current levels are usually much higher than those an individual signal line. Approved by:
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