AN-1109 datasheet(5/20 Pages) AD

Part #	AN-1109

Description	Recommendations for Control of Radiated Emissions with iCoupler Devices

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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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