Return-Path: Received: (qmail 5211 invoked from network); 16 Sep 2002 17:26:40 -0000 Received: from marstons.services.quay.plus.net (212.159.14.223) by mailstore with SMTP; 16 Sep 2002 17:26:40 -0000 Content-Transfer-Encoding: 8bit Received: (qmail 14335 invoked by uid 10001); 16 Sep 2002 18:30:41 -0000 X-Priority: 3 X-MSMail-Priority: Normal Received: from post.thorcom.com (193.82.116.70) by marstons.services.quay.plus.net with SMTP; 16 Sep 2002 18:30:41 -0000 X-SQ: A X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1106 Received: from majordom by post.thorcom.com with local (Exim 4.10) id 17qzdB-00079g-00 for rsgb_lf_group-outgoing@blacksheep.org; Mon, 16 Sep 2002 18:25:53 +0100 Received: from [212.125.75.12] (helo=mail4.messagelabs.com) by post.thorcom.com with smtp (Exim 4.10) id 17qzdA-00079W-00 for rsgb_lf_group@blacksheep.org; Mon, 16 Sep 2002 18:25:52 +0100 X-VirusChecked: Checked Received: (qmail 14037 invoked from network); 16 Sep 2002 17:25:29 -0000 Received: from unknown (HELO ukfw1.ge.boc.com) (193.131.2.157) by server-12.tower-4.messagelabs.com with SMTP; 16 Sep 2002 17:25:29 -0000 Received: from z-160-100-160-136.est.ibm.com ([160.100.160.136]) by ukfw1.ge.boc.com; Mon, 16 Sep 2002 18:25:29 +0100 (BST) Received: from exc_wil04.edwards.boc.com ([162.118.144.226]) by exc_cra03.edwards.boc.com with SMTP (Microsoft Exchange Internet Mail Service Version 5.5.2653.13) id SJ9KMJK6; Mon, 16 Sep 2002 18:28:28 +0100 Received: by EXC_WIL04 with Internet Mail Service (5.5.2653.19) id ; Mon, 16 Sep 2002 13:25:28 -0400 Message-ID: From: "Ashlock,William" To: rsgb_lf_group@blacksheep.org Date: Mon, 16 Sep 2002 13:25:28 -0400 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Subject: LF: RE: PSpice question Content-Type: text/plain; charset=iso-8859-1; format=flowed X-Spam-Status: No, hits=-0.1 required=5.0tests=FROM_NAME_NO_SPACESversion=2.31 Sender: Precedence: bulk Reply-To: rsgb_lf_group@blacksheep.org X-Listname: rsgb_lf_group Alberto, >I am just starting to play with this simulation tool and have a basic question. I modeled a >simple oscillator, with a 2N2222 and some passive components. If I simulate it with Electronics >Workbench it happily oscillates. With PSpice it doesn't, no matter how I change the feedback. >I suspect that some noise source should be added to trigger the oscillation, but don't know how, >nor I am sure that this is indeed true. Not sure what the secrete is to getting your oscillator to start. Are you using the Vcc as power supply? There has to be some kind of transient to get them to start. I've simulated a few oscillators over a year ago but can't remember having problems. I'll try the 2N2222 in a simple Colpits circuit when I find a spare moment and will get back to you. There are two great workbooks on Psice simulations by Roy W. Goody. The Title for both is 'MicroSim Pspice for Windows', copyright date 1998. Volume II is the one that covers oscillators. Check this tile on the various Web sites for used books and you might find a real bargain. Good luck! Bill A _____________________________________________________________________ This e-mail has been scanned for viruses by the WorldCom Internet Managed Scanning Service - powered by MessageLabs. For further information visit http://www.worldcom.com