[SI-LIST] Re: buffer selection
- From: Vivek Chandra <vivekchandra59@xxxxxxxxx>
- To: ariazi@xxxxxxxxxxxxxxx
- Date: Thu, 24 Nov 2005 12:35:53 +0530
Hello Kamran,
I agree with Ariazi as even i am not aware of any standard techniques for
buffer selection.
I could share some of the tips that i use when i chosing a buffer in high
speed design:
1) Make sure that the buffer is being used for either clock or data. If its
being used for data make sure that the frequency mentioned in the datasheet
is being used from DC to the specified value in the datasheet. This might
look silly but it could make a difference.
2) If the buffer your looking for is based on differential signally look out
for the common mode voltage charachteristics of your transmitter and
recevier.
3) If your application is jitter specific, make sure that the jitter
criterions are satisfied.
4) If the terminations are LVPECL/CML based differential input or outputs,
do look out for the dc-bias. LVDS signals have a common swing around 400mV
so these signals wont pose much problems.
5) Finally another silly point but i would consider this important because
you wouldnt want to repent later. :)
Make sure that the power supply operation is exactly according to your
operation.
Hope this helps you.
Regards
Vivek Chandra
Xalted Information Sytems Pvt. Ltd.
On 11/24/05, ariazi <ariazi@xxxxxxxxxxxxxxx> wrote:
>
>
> > Is there any standard methodology for buffer selection?
>
> Dear Kami,
>
> I am not aware of a standard technique for buffer selection. However,
> when selecting the buffer type for a high-speed digital design it can
> be helpful to evaluate/compare critical features of various signaling
> standards
> and logic families.
>
> Brian Young, "Digital Signal Integrity Modeling and Simulation with
> Interconnects
> and Packages" on pages 6 - 28 presents a comprehensive discussion of this
> topic.
> For instance, Tables 1.1 and 1.2 (on Pages 10 and 11) compare driver and
> receiver
> specifications for several popular signaling standers including TTL, GTL,
> HSTL, etc.
>
> Also, from signal integrity perspective it seems to me that sometimes
> there
> exits
> option of selecting a desired buffer type (or even specifying how a buffer
> should
> be designed for satisfactory performance). On the other hand, there are
> cases for
> which the buffer type is fixed and only the topology and termination can
> be
> varied
> to achieve optimum design.
>
> I hope you find this information helpful and with best regards,
>
> Abe Riazi
>
> ServerWorks
>
>
>
>
>
> ------------------------------------------------------------------
> 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:
> //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:
> //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:
//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:
//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:
