FreeLists / si-list / [SI-LIST] Re: AC termination

[David Instone <dave.instone@xxxxxxxxxx>]

If that was all there was to it then there would be no difference.  
However, assuming that you have a plane under these components then 
adding in the parasitic capacitance of the components and their mounting 
pads to this plane shows a difference.. Obviously how much of an effect  
depends on the frequency content of the signal.  The differences are 
easily visible on a TDR.

In the first case you have Cp to ground then series C with another Cp to 
ground,  then Cpr (Cp of the resistor) to ground then series R
In the second case you have Cpr  to ground, then series R another Cpr to 
ground, then Cp to ground, then series C.

Regards
Dave

#CHUANG KENG HUA# wrote:

>Hi there,
> 
> 
>What will be the effect of having the capacitor swapped with the resistor in 
>series with AC termination? 
> 
> |          | 
> |          |
>---         > 
>---    OR   >
> |          >
> >          |
> >         ---
> >         ---
> |          |
>GND        GND  
> 
>Regards,
>kenghua
> 
> 
>------------------------------------------------------------------
>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 FAQ wiki page is located at:
>                http://si-list.org/wiki/wiki.pl?Si-List_FAQ
>
>List technical documents are available at:
>                http://www.si-list.org
>
>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 FAQ wiki page is located at:
                http://si-list.org/wiki/wiki.pl?Si-List_FAQ

List technical documents are available at:
                http://www.si-list.org

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