Arun,
To think about these, equate these to electromagnetics in free space:
The rise time/fall time can be thought of in terms of frequency band.
"Speed" is not a
good term to use for this parameter.
The propagation delay is the velocity of the electomagnetic disturbance
through "space".
Frequency and delay are independent entities. One can have multiple
frequencies
on a channel, yet they all propagate at the same m/s (ignoring
dielectric dependent variations).
Ralph
On 2/24/2017 7:27 AM, Arun Kumar K wrote:
Hi All,
Thanks for your input.
Still I am not clear with this point.
For the better understanding.
For the 10inch routed track in FR4 pcb, what will be the maximum allowable
speed?
For 5GHz what will be the maximum allowable track length?
Both are same question.
Rise time and fall time are depends on Driver. If my understanding is correct.
Correct me if I am wrong.
This question is also confusing me. For 0.1ns rise time what will be the
maximum allowable track length?
Arun Kumar K
-----------------------------------------------------------
Arun
They are not related. Rise time relates to the driver electronics that
creates the signal. Propagation delay is related to the dielectric constant
of the media that the signal is traveling through.
Much like in audio, attack time for an instrument is unrelated to the time
the sound propagates through air.
Scott McMorrow, CTO Signal Integrity Group Samtec Office 401-284-1827 |
+1-800-726-8329 www.samtec.com<http://www.samtec.com>
------------------------------------------------------------------------
From: Ramani Tatikola [mailto:rtatikola@xxxxxxxxx]
Sent: Friday, February 24, 2017 6:38 PM
To: Arun Kumar K
<ArunKumar.K@xxxxxxxxxxxxxxxxxxx<mailto:ArunKumar.K@xxxxxxxxxxxxxxxxxxx>>
Subject: Re: [SI-LIST] Propagation delay Vs Speed(edge rate)
Hello Arun,
Tx delay is based on physical length of the line. Edge rate is time domain
parameter.
Delay and edge rate are connected by Frequency and Time relationship and you
can find them in any text book on Electromagnetics.
Regards,
Ramani
From: Arun Kumar K
Sent: Friday, February 24, 2017 11:54 AM
To: si-list@xxxxxxxxxxxxx
Subject: Propagation delay Vs Speed(edge rate)
Hi All.
I am having small doubt about in Transmission Line, between Propagation delay
and Speed(edge rate).
How we can relate the propogation delay and speed(edge rate)?
How to relate the Speed of the singal and propogation length (Transmission
line length) ?
How to relate the above prameter for the analog signals (slow edge rate)?
Arun Kumar
L&T Technology Services Ltd
www.LntTechservices.com<http://www.lnttechservices.com/>
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