[SI-LIST] Re: Terminating a branched clock line
- From: "Bill Hargin" <billh@xxxxxxxxxxxxxxxxxxxxxxx>
- To: <kevinlfitzgerald@xxxxxxxx>, <si-list@xxxxxxxxxxxxx>
- Date: Fri, 12 Apr 2002 09:49:44 -0700
Hi Kevin:
If the two branches are matched length and impedance--as they are here--it
makes the most sense to terminate as close to the driver as you can ...
before the branch. This gives you two benefits: one less component, and the
series resistor will be closer to the driver.
Best Regards,
Bill Hargin
Direct: 425-702-0744
Fax: 425-702-0305
Cognition Consulting
Electronic Design Software and Consulting
http://www.CognitionConsulting.com
> -----Original Message-----
> From: si-list-bounce@xxxxxxxxxxxxx
> [mailto:si-list-bounce@xxxxxxxxxxxxx]On Behalf Of kevinlfitzgerald
> Sent: Friday, April 12, 2002 8:12 AM
> To: si-list@xxxxxxxxxxxxx
> Subject: [SI-LIST] Terminating a branched clock line
>
>
>
> Hi,
>
> I have a clock signal with a 1ns rise time which is distributed to 2
> parts. The 50 Ohm lines are matched length within +/-50 thou after
> the branch. Our concern lies with the source termination. Should the
> source termination be before the branch, or immediately after the
> branch ?
>
> Any thoughts,
>
> Thanks,
>
> Kevin
>
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