[SI-LIST] Re: Inductance of PCB trace over ground plane
- From: Todd Hubing <HUBING@xxxxxxxxxxx>
- To: "si-list@xxxxxxxxxxxxx" <si-list@xxxxxxxxxxxxx>
- Date: Wed, 20 Feb 2013 15:52:40 +0000
Piyhatt,
If the trace is wide relative to its height above the plane, the inductance is
inversely proportional to the width. If the trace is narrow relative to its
height above the plane, the inductance is inversely proportional to the log of
the width.
Todd
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Prof. Todd H. Hubing
Michelin Professor of Vehicle Electronics
Electrical and Computer Engineering Dept.
310 Fluor Daniel Bldg.
Clemson University
Clemson, SC 29634-0915
Phone: +1 864 656 7219
FAX: +1 864 656 7220
Email: hubing@xxxxxxxxxxx
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-----Original Message-----
From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx] On
Behalf Of Piyush Bhatt
Sent: Tuesday, February 19, 2013 3:14 PM
To: si-list@xxxxxxxxxxxxx
Subject: [SI-LIST] Inductance of PCB trace over ground plane
Hi Si Gurus
I was wondering that is the inductance of PCB trace over a ground plane. Is
inductance changes logarithmic with width or is inversely proportionally.
These sites shows formulas which say
loghttp://www.informit.com/articles/article.aspx?p9477&seqNum=9
http://www.daycounter.com/Calculators/Microstrip-Inductor-Calculator.phtml
whereas this says inversely
http://www.technick.net/public/code/cp_dpage.php?aiocp_dp=util_inductance_trace_g
.
May be they take different assumption? what can somebody explain to me what is
the assumption?Book i am reading shows derivation of this formula assuming
distance from plane is much less than width of the trace which is simmillar to
assumption mentioned in link with formula with log version.
ThanksPiyhatt
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