EEVblog

Описание: What difference does a 4 layer PCB make to EMC radiated emissions compared to an identical 2 layer PCB? And why?

Dave does H-Field near-field probe testing on two otherwise identical PCB's.

Electromagnetic waves and the difference between near field and far field, and H-Field and E-field probes and wave impedance is also explained.

The PCB layout is then examined to look at loop area and by-passing and what effect this has.

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Designing the 4 layer board:    • KiCAD PCB Design  

Bypass capacitor Visualised:    • EEVblog #1085 - Bypass Capacitors Visualised!  
PCB Power Plan Capacitance:    • EEVblog #1117 - PCB Power Plane Capacitance  

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