[SI-LIST] Re: Can I get this from an IBIS model?

Doug,

go to the I/V curves and at  1 Volt compute the output resistance.  The 
behavior here is fairly indicative of the impedance across most of the 
output range.

Z = E/I

At 1 volt in the table, the impedance is the inverse of the current. 
 From this you can build a table of the range of impedance of the device 
from min to max, rising and falling edge.

best regards,

scott

-- 
Scott McMorrow
Teraspeed Consulting Group LLC
2926 SE Yamhill St.
Portland, OR 97214
(503) 239-5536
http://www.teraspeed.com



Doug Brooks wrote:

>Suppose I have an IBIS model, but not the physical part. Is there a way I 
>can determine the output impedance of the device (and if different, the 
>output impedance for each digital state) from the IBIS model itself?
>
>I know I can build a simulation and solve for the output impedance that 
>way, but can I get it from the IBIS model itself without going through the 
>simulation step? . And if so, where in a model do I look?
>
>Thanks for any help.
>
>Doug Brooks
>
>_______________________________________________________________________________
>UltraCAD Design announces availability of its new book "Signal Integrity 
>Issues in PCB Design"
>Details at  www.ultracad.com
>
>
>------------------------------------------------------------------
>To unsubscribe from si-list:
>si-list-request@xxxxxxxxxxxxx with 'unsubscribe' in the Subject field
>
>or to administer your membership from a web page, go to:
>http://www.freelists.org/webpage/si-list
>
>For help:
>si-list-request@xxxxxxxxxxxxx with 'help' in the Subject field
>
>List archives are viewable at:     
>               http://www.freelists.org/archives/si-list
>or at our remote archives:
>               http://groups.yahoo.com/group/si-list/messages 
>Old (prior to June 6, 2001) list archives are viewable at:
>               http://www.qsl.net/wb6tpu
>  
>
>
>  
>



------------------------------------------------------------------
To unsubscribe from si-list:
si-list-request@xxxxxxxxxxxxx with 'unsubscribe' in the Subject field

or to administer your membership from a web page, go to:
http://www.freelists.org/webpage/si-list

For help:
si-list-request@xxxxxxxxxxxxx with 'help' in the Subject field

List archives are viewable at:     
                http://www.freelists.org/archives/si-list
or at our remote archives:
                http://groups.yahoo.com/group/si-list/messages 
Old (prior to June 6, 2001) list archives are viewable at:
                http://www.qsl.net/wb6tpu

Other related posts: