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AN-1109 Datasheet(PDF) 5 Page - Analog Devices |
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AN-1109 Datasheet(HTML) 5 Page - Analog Devices |
5 / 20 page Application Note AN-1109 Rev. 0 | Page 5 of 20 SOURCES OF CONDUCTED NOISE Large currents and frequencies also generate conducted noise on the ground and power planes. This can be addressed with the same techniques for radiated emissions because the causes and remedies for both types of EMI can be improved with the same PCB ground and power structures. The inability of the bypass capacitors and ground/power planes to provide adequate high frequency current to the iCoupler device causes VDD noise. The iCoupler isolator transmits data across the transformer in bursts of 1 ns pulses with an ampli- tude of 70 mA. An ideal bypass capacitor of 100 nF should be adequate to supply the ac component of the current. However, bypass capacitors are not ideal and may connect to the ground or power planes through an inductive via. In addition, a large distance between ground and power planes creates a large inductance between them, which restricts the ability to supply current quickly. These factors may contribute to a large fraction of a volt of high frequency noise on the VDD plane. |
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