[SI-LIST] Re: Series termination and damping resistors
- From: "Todd Westerhoff" <twesterh@xxxxxxxxxx>
- To: <si-list@xxxxxxxxxxxxx>
- Date: Wed, 4 Jul 2012 07:43:40 -0400 (EDT)
All,
I drag this link out every few years and post it; now seems like a good
time:
http://www.eda.org/ibis/summits/jun05/westerhoff.pdf
Happy 4th to those of you who celebrate it.
Todd.
Todd Westerhoff
VP, Software Products
Signal Integrity Software Inc. ? www.sisoft.com
6 Clock Tower Place ? Suite 250 ? Maynard, MA 01754
(978) 461-0449 x24 ? twesterh@xxxxxxxxxx
?I want to live like that ?
-Sidewalk Prophets
-----Original Message-----
From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx]
On Behalf Of Tesla
Sent: Tuesday, July 03, 2012 9:10 PM
To: weirsi@xxxxxxxxxx
Cc: si-list@xxxxxxxxxxxxx
Subject: [SI-LIST] Re: Series termination and damping resistors
Hi, Steve
The resistor value approximates the difference between the TX line
characteristic impedance and the driver V/I load line characteristic.
We know the "the driver V/I" may not be a constant for the rising ,falling
edge, high and low edge, which V/I should we choose to match the line
charateristic impedance?
Thanks.
Tesla.
At 2012-07-04 00:45:07,"steve weir" <weirsi@xxxxxxxxxx> wrote:
>A series damping resistor is any series resistor of any value placed
>anywhere in the line to dissipate reflections A series terminating
>resistor is a resistor placed at the transmit end of the line where the
>resistor value approximates the difference between the TX line
>characteristic impedance and the driver V/I load line characteristic.
>
>Steve.
>On 7/3/2012 8:55 AM, Jason Young wrote:
>> Dear experts,
>> Is a "series terminating resistor" the same as a "series damping
resistor"?
>> Regards,
>> Jason
>>
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>
>
>--
>Steve Weir
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