Return-Path: Received: (qmail 77995 invoked from network); 13 May 2004 15:36:47 -0000 Received: from unknown (HELO ptb-mxscan02.plus.net) (212.159.14.236) by ptb-mailstore03.plus.net with SMTP; 13 May 2004 15:36:47 -0000 Received: (qmail 51598 invoked from network); 13 May 2004 15:36:45 -0000 X-Filtered-by: Plusnet (hmail v1.01) X-Spam-detection-level: 11 Received: from ptb-mxcore02.plus.net (212.159.14.216) by ptb-mxscan02.plus.net with SMTP; 13 May 2004 15:36:38 -0000 Received: from post.thorcom.com ([193.82.116.20]) by ptb-mxcore02.plus.net with esmtp (Exim) id 1BOIGC-000Cfq-Nu for dave@picks.force9.co.uk; Thu, 13 May 2004 15:36:38 +0000 X-Fake-Domain: majordom Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1BOIFc-0005Zj-Hz for rs_out_1@blacksheep.org; Thu, 13 May 2004 16:36:00 +0100 Received: from [213.232.95.59] (helo=relay.salmark.net) by post.thorcom.com with esmtp (Exim 4.14) id 1BOIFc-0005Za-59 for rsgb_lf_group@blacksheep.org; Thu, 13 May 2004 16:36:00 +0100 Received: from cmsrelay02.mx.net ([165.212.11.111]) by relay.salmark.net with smtp (Exim 4.24) id 1BOOnt-0006o4-4g for rsgb_lf_group@blacksheep.org; Thu, 13 May 2004 23:35:49 +0100 Received: from uadvg130.cms.usa.net (165.212.11.130) by cmsoutbound.mx.net with SMTP; 13 May 2004 15:35:43 -0000 Received: from usa.net [151.41.143.11] by uadvg130.cms.usa.net (ASMTP/dibene@usa.net) via mtad (C8.MAIN.3.13N) with ESMTP id 685iemPjO0228M30; Thu, 13 May 2004 15:35:41 GMT X-USANET-Auth: 151.41.143.11 AUTH dibene@usa.net usa.net Message-ID: <40A395D3.80409@usa.net> Date: Thu, 13 May 2004 17:35:47 +0200 From: Alberto di Bene User-Agent: Mozilla/5.0 (Windows; U; Win98; en-US; rv:1.4) Gecko/20030624 Netscape/7.1 (ax) X-Accept-Language: en-us, en MIME-Version: 1.0 To: rsgb_lf_group@blacksheep.org References: <40A2578C.2080600@usa.net> <003301c438f8$97eaaa40$511297d4@oemcomputer> <007901c438fd$7c478600$0702a8c0@parissn2> In-Reply-To: <007901c438fd$7c478600$0702a8c0@parissn2> X-Spam-Score: 2.8 (++) X-Spam-Report: autolearn=no,FAKE_HELO_USA_NET=2.8 Subject: LF: Re: VDC source with microvolt resolution Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 8bit X-Spam-Checker-Version: SpamAssassin 2.63 (2004-01-11) on post.thorcom.com X-Spam-Level: ** X-Spam-Status: No, hits=2.8 required=5.0 tests=FAKE_HELO_USA_NET autolearn=no version=2.63 X-SA-Exim-Scanned: Yes Sender: owner-rsgb_lf_group@blacksheep.org Precedence: bulk Reply-To: rsgb_lf_group@blacksheep.org X-Listname: rsgb_lf_group X-SA-Exim-Rcpt-To: rs_out_1@blacksheep.org X-SA-Exim-Scanned: No; SAEximRunCond expanded to false X-PN-SPAMFiltered: yes X-Spam-Rating: 1 Hi Stewart, another interesting suggestion to add to the "bag of tricks" for this project ! Thanks. 73 Alberto I2PHD ------------------------------ Stewart Nelson wrote: >Hi Alberto, > >The filtering requirements are less onerous if the >dithering frequency components are maximized, e.g. by >a DDA algorithm. In Johan's example, add 442 to a >variable each main PWM cycle. If the result is less >than 1024, send 705 to the PWM. Otherwise, send 706 >and subtract 1024 from the variable. This results >in a sequence of 705, 705, 706, 705, 706, 705, etc. >