Inductors are used in switching power supplies to store energy in the form of a
magnetic field. This field increases and decreases over every switching cycle.
The resulting magnetic field external to the (magnetically shielded) inductor
can be minimized by careful layout.
However, copper is ineffective in reducing magnetic fields. Distance is your
best strategy.
Linear Tech has some good app notes on the topic.
http://cds.linear.com/docs/en/application-note/an139f.pdf
http://cds.linear.com/docs/en/application-note/an25fa.pdf
Curt
Curt McNamara, P.E.
Engineering Consultant
612.305.0440 x248
www.npe-inc.com
-----Original Message-----
From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx] On ;
Behalf Of John Lin
Sent: Wednesday, March 15, 2017 1:01 AM
To: si-list <si-list@xxxxxxxxxxxxx>
Subject: [SI-LIST] Ground planes beneath power inductor/choke to isolate high
speed digital signal.
Dear SI gurus,
Could someone share experience on routing high speed digital signal
10GHz(layer 3), beneath inductors ( on the top layer)in switching power circuit
area with ground plane(s) (layer 2)for isolation?
What tools should be used to simulate induced noise coupling?
How many ground planes should be used to isolate noise induced by the inductors?
Thank you for helps in advance.
Regards,
John Lin
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