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October 1999

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Subject:
Resistance of trace
From:
Nicholas LAI <[log in to unmask]>
Reply To:
TechNet E-Mail Forum.
Date:
Wed, 6 Oct 1999 09:37:13 +0800
Content-Type:
text/plain
Parts/Attachments:
text/plain (32 lines) 
Hello all,

Is there anyone can answer the following question.

When we calculate the resistance value of an trace on a PCB Board.

We use R=ρl/A  where l is the line of trace, A is the coss-section area of the
trace and ρis the presistivity of copper.

After we measure of the board, the actual resistance value is larger than the
Theorical value around 20% . Why the different is so larger. Do I use the wong
formula?
Can anyone help on me?

Best Regard,
Nicholas Lai
10/6/99

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