[SI-LIST] Re: Power and Ground Plane area
- From: zhangkun 29902 <zhang_kun@xxxxxxxxxx>
- To: darshanmehta2k@xxxxxxxxx
- Date: Thu, 02 Dec 2004 08:11:16 +0800
Darshan
According to my experience=2C 1MHz should be cared=2C which is the freque=
ncy not the signal speed=2E However=2C the exact frequency depends on the=
stack-up of the PCB=2E
In low frequency domain=2C the resistive impedance is large=2E The power =
or ground plane should not be used=2E Single-ground should be applied=2E =
Otherwise=2C there is resistive coupling=2E
If the return path is needed=2C a testing board could be made=2C which is=
of two-layer=2E The top is for signal and the bottom is for ground=2E A =
maganetic probe is applied to measure the tangent H on the ground plane=2C=
where J=3DH=2E We have used this kind of PCB to study the return path of=
signal of 2MHz=2E Maybe in the low frequency=2C the H is difficult to be=
measured=2E
Hope this is helpful=2E
Best Regards
Zhangkun
2004=2E12=2E2
----- Original Message -----
From=3A Darshan Mehta =3Cdarshanmehta2k=40yahoo=2Ecom=3E
Date=3A Wednesday=2C December 1=2C 2004 11=3A00 pm
Subject=3A =5BSI-LIST=5D Power and Ground Plane area
=3E Hello Everybody=2C
=3E =
=3E I was reading one of the IEEE paper on topic =22EMC Analysis=22 by Dr=
=2E =
=3E Tom Van=2E He says that Return current takes the least impedance =
=3E path=2E If the signal speed is 1 KHz=2C there is no need of Power or =
=3E Ground Plane because even if you have Power Plane=2C the return =
=3E current will not effectively utilize the plane=2E So my question is=2C=
=
=3E how we should decide at what signal speed we should use Plane area =
=3E for Power and Ground=2E Is there is any specific formula for that=2E =
=3E Thanks=2E
=3E Best Regards
=3E =
=3E =
=3E Darshan Mehta
=3E =
=3E =
=3E =
=3E =
=3E =
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