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ADM3260 其他数据使用手册 - ADI（亚德诺）
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ADM3260数据手册
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AN-0971 Application Note
Rev. C | Page 6 of 20
SOURCES OF CONDUCTED NOISE
The large currents and frequencies also generate conducted
noise on the ground and power planes. This issue is addressed
along with radiated emissions because the causes and remedies
for both types of EMI are addressed 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 isoPower dc-
to-dc converter causes V
DD
noise. The dc-to-dc converter switches
power in bursts of 2.5 ns pulses with an amplitude of ~700 mA.
An ideal bypass capacitor of a few microfarads should be ade-
quate to supply the ac component of the current. Real world
bypass capacitors are not ideal, and they connect to one or,
more likely, both of the power planes by an inductive via. In
addition, a large distance between ground and power planes
creates a large inductance between them, restricting their ability
to supply current quickly. These factors contribute to a large
fraction of a volt of high frequency noise on the V
DD
plane.
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