I wanted to thank everyone who answered my question. My client still
hasn't given me an answer regarding this, so for anyone who might be
curious about this, I'll keep you posted as soon as I find out.
Thanks again,
Eric Bonatti, C.I.D.
PCB Designer
StrataFLEX Corporation
Tel.: +1.416.752.2224 xt.227
Fax: +1.416.752.6719
Toll Free: +1.866.771.7765
E-mail: [log in to unmask]
Web: www.strataflex.com
-----Original Message-----
From: Ken [mailto:[log in to unmask]]
Sent: Friday, 15 April 2005 17:52 PM
To: [log in to unmask]
Subject: Re: [TN] impedance value very high
That's just what I was thinking. The microstrip model is pretty
unreliable
for that impedance but
a diff pair sounds a little better. I can hit 333 ohms with a 5mil
trace,
1.2oz finished, 72mil gap and 59mil height above GND plane using PTFE
2.1.
Just one way to do it...could use a 4 mil trace if possible as well.
Ken
------------------------------
Kenneth J. Wood
Saturn PCB Design
www.saturnpcb.com
----- Original Message -----
From: "Brooks,Bill" <[log in to unmask]>
To: <[log in to unmask]>
Sent: Friday, April 15, 2005 5:41 PM
Subject: Re: [TN] impedance value very high
> Just a guess... but the old TV antenna 'twin lead' was 300 ohm
> impedance...
> maybe they want a differential impedance between two lines on the
board
> rather than an impedance with respect to a ground plane like micro
strip
> does ???
>
> Bill Brooks - KG6VVP
> PCB Design Engineer , C.I.D.+, C.I.I.
> Tel: (760)597-1500 Ext 3772 Fax: (760)597-1510
> e-mail:[log in to unmask]
> http://www.dtwc.com
> http://pcbwizards.com
>
> -----Original Message-----
> From: Mcmaster, Michael [mailto:[log in to unmask]]
> Sent: Friday, April 15, 2005 2:37 PM
> To: [log in to unmask]
> Subject: Re: [TN] impedance value very high
>
> I ran this through our field solver. For a 1 mil trace, you'd need a
> dielectric thickness of about 5 inches to do this.
>
> Thick as a brick.
>
> -----Original Message-----
> From: TechNet [mailto:[log in to unmask]] On Behalf Of Eric Bonatti
> Sent: Friday, April 15, 2005 10:28 AM
> To: [log in to unmask]
> Subject: [TN] impedance value very high
>
> I have a puzzling question for you impedance experts:
>
> A customer is asking for a PCB characteristic impedance for a single
> trace to be 332 Ohms +/- 5%.
>
> I've never seen a requirement for an impedance to be this high. Has
> anyone here seen this before? HyperLynx is choking on this.
>
> Thank you in advance for your input, it is greatly appreciated.
>
>
> Eric Bonatti, C.I.D.
> PCB Designer
> StrataFLEX Corporation
> Tel.: +1.416.752.2224 xt.227
> Fax: +1.416.752.6719
> Toll Free: +1.866.771.7765
> E-mail: [log in to unmask]
> Web: www.strataflex.com
>
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