RE: [SI-LIST] : which layers should I use for routing my high spe ed traces

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From: Greim, Michael ([email protected])
Date: Mon May 07 2001 - 11:57:45 PDT


Ok,

I'll ask the obvious question. If all you have is
peclpower and ground, why don't you simply change
layer 3 and 9 to peclpower and layer 6 to ground
and then you would have the most flexibility in your
design. Then you could route on any of the layers.

Whaddya think?

Best Regards,

Michael C. Greim Sonus Networks
[email protected] 978-589-8336

Making the world safe for digital signals everywhere

And all this science I don't understand
It's just my job six days a week

The time is gone. The email's over
Thought I'd something more to say......

-----Original Message-----
From: Saeen Malik [mailto:[email protected]]
Sent: Monday, May 07, 2001 2:38 PM
To: [email protected]g.sun.com
Subject: [SI-LIST] : which layers should I use for routing my high speed
traces

I have the following stackup. I need to route 644 MHz. PECL signals. Which

layers should I use

------------------ gnd
      ---- route layer 1
------------------ gnd
      ---- route layer 2
      ---- route layer 3
------------------ peclpower
      ---- route layer 4
      ---- route layer 5
------------------ gnd
      ---- route layer 6
------------------ gnd

My inclination is to use layers 2,3 and 4,5 because it would provide return

path for
both cases - switching high and low. On the other hand if I use the single
stripline layers,
the return current when the device switched high would have to go through a
cap to enter the power
pin.

What do you people think???

Saeen
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