[SI-LIST] Parametric sweep in Scratch pad

Hi Gurus, 
         I am trying to do the Parametric sweep  in Scratch Pad. I have one
question on analysing the excel sheet generated by the Scratch pad. I want
to check whether is there any Threshold Multicrossing error in the generated
spread sheet. But i couldn't figure out it properly. Could any body please
suggest me a way to do that?

Thanks in Advance,
Sivakumar.S
         

-----Original Message-----
From: Vinu Arumugham [mailto:vinu@xxxxxxxxx]
Sent: Wednesday, April 24, 2002 10:15 PM
To: lucas_bossetti@xxxxxxxxxxx
Cc: si-list@xxxxxxxxxxxxx
Subject: [SI-LIST] Re: Clock signal termination



With a 3.3V driver, the 178 ohm parallel term appears to produce a ~2.5V
swing at the receiver. Maybe the receiver is a 2.5V part.
Maybe they were trying to trim the duty cycle.
For the perfectionist, the series term may have to be 55-2*7=41 ohm instead
of 36 ohm.

Thanks,
Vinu

Lucas Bossetti wrote:

> Hi all,
> In the schematic of an evaluation board I've seen some clock nets like
that:
>
>
parallel term to gnd R=178 ohm
>
|
>
|
>                                     |---SERIES TERM 36ohm----Tline 55
ohm------|----RECEIVER
> DRIVER 7 ohm--------|
>                                     | --SERIES TERM 36ohm-----Tline 55
ohm------|---RECEIVER
>
|
>
|
>
parallel term to gnd R=178 ohm
>
> Can someone explain me why the value of the parallel term is 178 ohm?
> Any comment will be appreciate.
>
> Thanks in advance
> Lucas
>
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