From: Sean Murray (firstname.lastname@example.org)
Date: Fri Dec 01 2000 - 10:48:33 PST
That's what I thought, I'm looking at getting 135 ohms with a 4 mil line and
50/50 (a bunch of prepreg).
From: Ray Anderson [mailto:Raymond.Anderson@Eng.Sun.COM]
Sent: Friday, December 01, 2000 11:43 AM
To: email@example.com; firstname.lastname@example.org.Sun.COM
Subject: RE: [SI-LIST] : 200 ohms
Looks like a case of 'you can't get there from here'. Even if you could
etch a 1 mil line (good luck), you'd still have about an 80 ohm line for FR4
or a whole 110 ohms if you used Duroid.
> Actually, have to do it internally, and using stripline it's about
> impossible when you only have .236 to work with.
> -----Original Message-----
> From: Ray Anderson [mailto:Raymond.Anderson@Eng.Sun.COM]
> Sent: Friday, December 01, 2000 11:22 AM
> To: email@example.com; firstname.lastname@example.org.Sun.COM
> Subject: Re: [SI-LIST] : 200 ohms
> Not sure what you are trying to do, but if you go microstrip,
> a 4 mil wide trace on a 250 mil thick FR4 substrate will give
> you about 200 ohms impedance. (according to apsim RLGC)
> > Anyone able to achieve 200 ohms on .250 thick board before? If not what
> > the closest achievable board impedance within reason?
> > Sean Murray
> > General Manager
> > M&M Specialties, Inc.
> > 1236 W. Southern Ave. #106
> > Tempe, AZ 85282
> > 1-800-892-8760 x105
> > www.mmspec.com
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