关于地弹的一篇文章，来自analog.com

artofsleep · 发表于 2010-4-30 18:05:00

感谢楼主分享啊

ggm_1029 · 发表于 2011-5-5 11:41:58

谢谢，好好拜读！

freezing616 · 发表于 2011-6-20 14:27:03

Reducing Ground Bounce in
DC-to-DC Converters—Some
Grounding Essentials
By Jeff Barrow [jeff.barrow@analog.com]

freezing616 · 发表于 2011-6-20 14:28:38

Electrical ground1
looks simple on a schematic; unfortunately,
the actual performance of a circuit is dictated by its printed-
circuit-board (PCB) layout. What’s more, ground-node analysis is
difficult, especially for dc-to-dc converters, such as buck and boost
circuits, which pound the ground node with large, fast-changing
currents. When the ground node moves, system performance
suffers and the system radiates EMI. But a well-“grounded”
understanding of the physics of ground noise can provide an
intuitive sense for reducing the problem.
Ground bounce can produce transients with amplitudes of volts;
most often changing magnetic flux is the cause. A loop of wire
carrying current is essentially an electromagnet whose field strength
is proportional to the current. Magnetic flux is proportional to the
magnetic field passing through the loop area,