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Subject:	Re: Trace width ratio to pad
From:	Joseph Matthews <[log in to unmask]>
Reply To:	(Designers Council Forum)
Date:	Fri, 29 Jul 2005 10:25:29 -0700
Content-Type:	text/plain
Parts/Attachments:	text/plain (49 lines)

Yeah, I'd worry about that statement though...It's fun to try to confuse us engineers with techno-babble, but make sure it's correct. Greater trace width = *less* impedance / resistance. Resistance is inversely proportional to the width of the trace (meaning one value goes down when the other goes up). Thus when you require more current carrying capacity, you increase the trace width. Current being the flow of electrons, to support a greater flow of electrons (the opposite of which is resistance) you need to increase the area of conductive material.

If you use the line that increasing the trace width will increase the resistance you just might find yourself toting your things home in a box by day's end. Smiles everybody, it's Friday.

Cheers,

joe

Matthew Lamkin <[log in to unmask]> wrote:
Ah, that's it, bamboozle him with his own techno babble..
Now that's the best suggestion yet.

You can also get the assembly department to define their preferences
and whatever assembly want is usually enough to make it a law written in stone :-)

For Signal traces you might what to use the argument that more
copper will give him more resistance and actually will cause more
impedance to the rise time on his circuit. This may cause him to
rethink his request. Sometimes if you talk their language you can get
your point across without having to use other drastic measures. ;-)

Joe J. - C.I.D.

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