[SI-LIST] Re: using spice to calculate driver output impedance

You may want to look at a similar package to include the package
parasitics
In an IBIS file, you see sections that look like this. (so your RLC
parameters should be similar for the same package type)
|***********************************************************************
*
|                         Component UT54LVDS032 
|***********************************************************************
*
|
[Component]      UT54LVDS032 
[Manufacturer]   UTMC 
[Package]
| variable       typ                 min                 max
R_pkg            100.0000m           50.0000m            0.2000
L_pkg            1.0000nH            1.0000nH            1.0000nH
C_pkg            1.5000pF            0.5000pF            2.0000pF
|
[Pin]  signal_name          model_name           R_pin     L_pin
C_pin
1      rin1-                jr06ainn             0.2000    1.0000nH
1.5000pF
2      rin1+                jr06ainp             0.2000    1.0000nH
1.5000pF
3      rout1                jr06aout             0.1000    1.0000nH
1.5000pF
4      en                   jr06ain              0.1000    1.0000nH
1.5000pF
5      rout2                jr06aout             0.1000    1.0000nH
1.5000pF
6      rin2+                jr06ainp             0.1000    1.0000nH
1.5000pF
7      rin2-                jr06ainn             0.2000    1.0000nH
1.5000pF
8      vss                  GND
9      rin3-                jr06ainn             0.2000    1.0000nH
1.5000pF


-----Original Message-----
From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx]
On Behalf Of Steve Weir
Sent: Wednesday, February 23, 2005 5:14 PM
To: ericsilist@xxxxxxxxx; si-list@xxxxxxxxxxxxx
Subject: [SI-LIST] Re: using spice to calculate driver output impedance


Eric, the inductive reactance will not add linearly.  Do the vector
addition and you will find that the resistor value will be a lot closer
to
the 35.5 ohms that the resistive slope would lead to by itself.  Off the
top of my head, I think you will find 30-33 ohms about right.

Steve
At 04:11 PM 2/22/2005 -0800, eric steimle wrote:
>Hi all, I'm having some trouble thinking of the right
>way to calculate driver impedance using spice.  I have
>finally a functioning model of the driver in question
>and I've been able to run some simulations with it.  I
>was hoping that there might be an accepted way of
>calculating driver impedance out there that I don't
>know about, or perhaps some literature you could point
>me to.  Any help would be greatly appreciated.
>
>Best Regards,
>Eric
>
>
>
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