Subject: Re: 3D3428 minimum pulse
From: "Victor D. Lupi, PhD" <[email-masked]>
To: "Alan Stummer" <[email-masked]>
Date: Wed, 19 Nov 2008 11:16:16 -0500

Hello Alan,

If the 15ns pulse were occurring at a constant frequency, then there would 
be little or no delay jitter. Unfortunately, when the frequency is random, 
there will be some jitter introduced. Exactly how much is introduced will 
depend on the nature of the input. If the period is generally long (>400ns), 
then variations in the period will not cause any significant jitter. If, 
however, the period is generally short (~50ns), then there will be some 
degradation. Other factors that affect jitter are the loading on the delay 
line output and the board layout (power supply bypassing, ground plane, 
etc).

I hope this helps. Please feel free to contact me directly with any 
additional questions.

Regards,
Victor D. Lupi, PhD
Data Delay Devices, Inc.
3 Mt. Prospect Avenue
Clifton, NJ  07013
www.datadelay.com
973-773-2299  x123
973-773-9672 (Fax)

----- Original Message ----- 
From: "Alan Stummer" <[email-masked]>
To: <[email-masked]>
Sent: Tuesday, November 18, 2008 5:11 PM
Subject: 3D3428 minimum pulse

> Hi;
>
> I do not understand the reason for minimum input pulses widths, so here is 
> a question.  If we use the 3D3428-1 or 3D3428-1.5 with an input pulse 
> width of always 15nS but random period, will the delay always be the same 
> even if it is not strictly as calculated?  In other words, will the jitter 
> between input rising edge and output rising edge still be within spec?
>
> Thanks,
> Alan
>
> -- 
> *********************************
> Alan Stummer
> University of Toronto - Physics
> 416-978-4400
> www.physics.utoronto.ca/~astummer
> Skype:     alanstummer
> Google IM: [email-masked]
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