[SI-LIST] Re: termination resistor
- From: "Lambert Simonovich" <bertsimonovich@xxxxxxxxxx>
- To: <tanxiaoliang1987@xxxxxxxxx>, <si-list@xxxxxxxxxxxxx>
- Date: Sun, 23 Dec 2012 19:06:53 -0500
Because the driver is a semi-conductor, it's output impedance could vary
based on rising/falling edge transitions, manufacturing process (slow,
typical, fast), and the load it is driving. One way to estimate the driver's
impedance is by using an IBIS model of the device. Since IBIS models are
ASCII based, you can simply use your favourite text editor to view and
quickly estimate the output impedance when driving 50 Ohms by using two of
the four V-T waveform tables.
Here is the link to one of my blog postings, I did a while back titled,
"Determining Output Impedance from IBIS".
http://blog.lamsimenterprises.com/2010/12/22/drivers-output-impedance-from-i
bis/
Bert Simonovich
LAMSIM Enterprises Inc.
Web Site: http://lamsimenterprises.com
Blog: http://blog.lamsimenterprises.com/
-----Original Message-----
From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx] On
Behalf Of XiaoLiang Tan
Sent: December-22-12 10:02 PM
To: si-list@xxxxxxxxxxxxx
Subject: [SI-LIST] termination resistor
Dear Expert,
Hello, I am designing a high speed system.Since I don't know my
driver's output resistance, thus the termination resistor value is not
known. Thus may I use the variable resistor? If I use the variable resistor,
the size is big thus I am unable to put all the resistor near the driver.( I
have more than 10 outputs needs to be terminated). Which means the
termination resistor could not be put close to the drivers.
However, if I use a fixed and small size resistor, I need to trim
the resistor manually when I doing the testing.
So may I know that which one is more suitable? Thanks.
--
Best Regards
==================================
*Xiaoliang, Tan*
*
*
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