[SI-LIST] Re: TDR- rise time-channel bandwidth and speed
- From: "Orin Laney" <olaney@xxxxxxxxx>
- To: <fuyejun@xxxxxxxxx>, <si-list@xxxxxxxxxxxxx>
- Date: Thu, 12 Dec 2013 15:08:11 -0800
Given 10% to 90% risetime, the 3dB BW is 0.35/Tr. For 20% to 80% risetime
(as found on many logic datasheets), the correct formula is BW = 0.22/Tr.
These use the assumption that a single pole dominates the channel response.
Orin
-----Original Message-----
From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx] On
Behalf Of Yejun Fu
Sent: Thursday, December 12, 2013 1:22 PM
To: si-list@xxxxxxxxxxxxx
Subject: [SI-LIST] TDR- rise time-channel bandwidth and speed
Seems the more you want to dig and clear the more confuse you will have.
Some one tells me the more sharp rise time the better, it offers more
details that a lower rise time can't provide. someone says they prefer to
have filters to make a lower rise time to do TDR for a differential channel.
I want to know what is the right relation between the speed of signal
running through the channel and the rise time and the bandwidth related to
rise time and channel.
Thanks
Johnny
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