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Würth Elektronik Watts Up Podcast


Jun 17, 2021

In last week's broadcast, we began our discussion regarding the design of a USB but from a viewpoint of EMC considerations. We discussed the hardware and components, EMC circuitry, and the use of a USB filter. This week, we begin with the filter for DC supply.

REFERENCED IMAGES: 

Figure 11:

Figure 11- Complete 2.0 Circuit Diagram

Figure 12:

Figure 12- Insertion Loss

Figure 18: 

Figure 18- Theoretically Possible Insertion Loss

Figure 19:

Figure 19- Important Electrical Characteristics

Figure 21:

Figure 21: Low Pass Filter

Figure 22:

Figure 22- HF Corrected Layout

Figure 24:

Figure 24- USB Dongle

Figure 27:

Figure 27- Interference Emission Spectrum

Download the Application Note: The USB Interface from EMC Point of View