[SI-LIST] Re: Resistor Network
- From: Michael Nudelman <mnudelman@xxxxxxxxxxx>
- To: "'pvincent@xxxxxxxxxxxxx'" <pvincent@xxxxxxxxxxxxx>,si-list@xxxxxxxxxxxxx
- Date: Fri, 24 Aug 2001 15:42:37 -0400
RC network is a way to do not-so-critical termination. The problem being
that a capacitor of the small ones is way too small to act well in RC
parallel termination (the good value is around 200pF, and the one in small
RC terminators is 47pF, which is next to non-existent).
The last thing - teh resistor values in them are also may not match to what
you need (the set of values is limited). So your termination may become
unmatched.
I personally like discretes. Also, with R-networks, your layout may not be a
good one - you have to compromise on components' placement a lot.
However in non-critical signals (slow clocks, under 40MHz data-addr signals)
it may be OK to use RC-networks, even unmatching ones. As long as there is
no bad ringing and your overshoots are not "damaging" types.
Mike N.
-----Original Message-----
From: Patrick Vincent [mailto:pvincent@xxxxxxxxxxxxx]
Sent: Friday, August 24, 2001 3:30 PM
To: si-list@xxxxxxxxxxxxx
Subject: [SI-LIST] Resistor Network
Hi everybody,
What do you think of using Resistor Networks (R-PACK) for SSTL shunt and
series termination?
Me, I like to use discrete resistor for the shunt termination. This way,
current is less concentrated in one area so the VTT supply is more stable.
But now I'm very space limited (like a lot of you I guess...) so I'm
considering using them.
Also there is Resistor/Capacitor Network, what do you think about them?
Any suppliers to recommand for Termination Network?
Thanks in advance for your feedback
Patrick
------------------------------------------------------------------
To unsubscribe from si-list:
si-list-request@xxxxxxxxxxxxx with 'unsubscribe' in the Subject field
For help:
si-list-request@xxxxxxxxxxxxx with 'help' in the Subject field
List archives are viewable at:
//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
For help:
si-list-request@xxxxxxxxxxxxx with 'help' in the Subject field
List archives are viewable at:
//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:
