[SI-LIST] Re: zero ohm jumper spice models ??
- From: "Harvey, Wilbur" <Wilbur.Harvey@xxxxxxxxxxxxxx>
- To: gstokes@xxxxxxxxx,"'si-list@xxxxxxxxxxxxx'" <si-list@xxxxxxxxxxxxx>
- Date: Tue, 19 Aug 2003 07:23:51 -1000
I wonder, when a proper model is used, how this would affect the simulation
of a series termination resistor. At high frequencies, and close trace to
plane separation (say 3 mil), there could be quite a bit of difference
between resistors film being up/down. At high frequencies, in the gigahertz
range, he effective impedance of the resistor would seem to change quite a
bit.
If anyone comes up with a proper model I would love to see it.
We use mostly 0402 resistors on 0.020" square pads.
Wilbur Harvey - Engineer
Spirent Communications Inc., www.adtech-inc.com
First Hawaiian Center, 999 Bishop St.. Suite 1700
Honolulu, HI 96813
Tel: +1 (808) 440 3494, +1 (808) 440 3363 (Direct)
Mobile: +1 (808) 221 0395
email: wilbur.harvey@xxxxxxxxxxxxxx
-----Original Message-----
From: Geoff Stokes [mailto:gstokes@xxxxxxxxx]
Sent: Tuesday, August 19, 2003 1:02 AM
To: 'si-list@xxxxxxxxxxxxx'
Subject: [SI-LIST] Re: zero ohm jumper spice models ??
Hi Ray
Sounds like a candidate for Sonnet Lite, which is free. But that's a
full-wave analysis which may not be necessary for such a small part. If
you're working at, say 500Mbit/s, you might need information up to say, 2.5
GHz to include 5th harmonic.
I guess you have 3 metal layers:
1. the jumper conductor (top)
2. the track, including the track the jumper jumps over
3. the bottom metal ground plane
Is that structure right?
The worst part is the proximity of layer1 to layer 2. You might want to
mount the jumper upside-down, so that the film deposition is not right next
to the copper. To be accurate, you end up with a 4-port network with 5
terminals including ground. The model depends on the board and track
properties and dimensions. There is capacitive coupling between to the
under-path, but not inductive coupling, because the currents are
perpendicular.
Cheers
Geoff
> -----Original Message-----
> From: Ray Anderson [mailto:Raymond.Anderson@xxxxxxx]
> Sent: 19 August 2003 00:31
> To: si-list@xxxxxxxxxxxxx
> Subject: [SI-LIST] zero ohm jumper spice models ??
>
>
>
> Has anyone run across any published spice
> models for 0603 zero-ohm jumpers that
> incorporate parasitic C and L values.
>
> I'm getting ready to do some lab measurements to
> come up with my own model but it would be nice
> to see some others as a sanity check on my results.
>
> -Ray Anderson
> Sun Microsystems
>
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