Return-Path: X-Original-To: astummer@physics.utoronto.ca Delivered-To: astummer@physics.utoronto.ca Received: by helios-store.physics.utoronto.ca (Postfix, from userid 57) id C5A4BFEE6; Wed, 19 Nov 2008 11:16:19 -0500 (EST) Received: from smtp01.kooobra.com (smtp01.kooobra.com [216.107.140.11]) by helios-store.physics.utoronto.ca (Postfix) with ESMTP id 69406FEE1 for ; Wed, 19 Nov 2008 11:16:19 -0500 (EST) Received: from Vic2008 ([72.76.245.38]) by smtp01.kooobra.com (Veraciti Inc. Mail Services Ver 1.0) with ASMTP id ZBJ57817 for ; Wed, 19 Nov 2008 11:16:17 -0500 Message-ID: <5A101A5143524A3BBF5AC9658F83B715@Vic2008> From: "Victor D. Lupi, PhD" To: "Alan Stummer" References: <49233D8A.1060004@physics.utoronto.ca> Subject: Re: 3D3428 minimum pulse Date: Wed, 19 Nov 2008 11:16:16 -0500 Organization: Data Delay Devices, Inc. MIME-Version: 1.0 Content-Type: text/plain; format=flowed; charset="iso-8859-1"; reply-type=response Content-Transfer-Encoding: 7bit X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2900.5512 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.5579 X-Bogosity: Unsure, tests=bogofilter, spamicity=0.499923, version=1.1.5 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" To: 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: alanstummer@gmail.com > *********************************