{"id":7566,"date":"2023-02-28T21:14:28","date_gmt":"2023-02-28T20:14:28","guid":{"rendered":"https:\/\/medtech-ingenieur.de\/?p=7566"},"modified":"2023-02-28T21:14:28","modified_gmt":"2023-02-28T20:14:28","slug":"ltspice-was-tun-wenn-die-simulation-nicht-konvergiert","status":"publish","type":"post","link":"https:\/\/medtech-ingenieur.de\/en\/ltspice-was-tun-wenn-die-simulation-nicht-konvergiert\/","title":{"rendered":"LTspice \u2013 what to do if the simulation does not converge"},"content":{"rendered":"<p><a href=\"https:\/\/www.analog.com\/en\/design-center\/design-tools-and-calculators\/ltspice-simulator.html\" target=\"_blank\" rel=\"noopener\">LTspice <\/a>As a circuit simulation software, LTspice is probably familiar to every hardware developer. The brain behind LTspice was Mike Engelhardt, which many probably know, as he participated in the LTspice World Tour for many years and held seminars on LTspice.<\/p>\n<p>At <a href=\"https:\/\/theamphour.com\/196-an-interview-with-mike-engelhardt-spice-simulator-synteresis\/\" target=\"_blank\" rel=\"noopener\">\u201cThe Amp Hour Electronics Podcast\u201d<\/a> There&#039;s an episode from 2014 that I can recommend to every hardware developer. In the episode, Mike Engelhardt talks about Spice simulators and offers, among other things, the following tips for LTspice:<\/p>\n<ul>\n<li>The GMIN parameter should ideally be set to 0. This parameter is especially needed when simulating diodes in series. If you experience problems, you can enable the GMIN hack in LTspice.<\/li>\n<li>Always start with the Normal Solver. It&#039;s about 10 times faster than the Alternate Solver, but much less accurate. If you experience problems with convergence or artifacts, you can switch to the Alternate Solver.<\/li>\n<li>The TRTOL parameter is normally set to 7 in Spice programs. In LTspice, the parameter can be set to 1, and only if problems occur is it set to 7. Lower values result in more accurate solutions (fewer artifacts); higher values make the simulation run faster, but may contain artifacts that experienced circuit engineers can recognize.<\/li>\n<\/ul>\n<p>The parameters can be set in LTspice via simulate-&gt; Control Panel -&gt; SPICE.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"size-medium wp-image-7574 alignleft\" src=\"https:\/\/medtech-ingenieur.de\/wp-content\/uploads\/2023\/02\/Simulation_Zenerdiode-300x223.png\" alt=\"\" width=\"300\" height=\"223\" srcset=\"https:\/\/medtech-ingenieur.de\/wp-content\/uploads\/2023\/02\/Simulation_Zenerdiode-300x223.png 300w, https:\/\/medtech-ingenieur.de\/wp-content\/uploads\/2023\/02\/Simulation_Zenerdiode-768x570.png 768w, https:\/\/medtech-ingenieur.de\/wp-content\/uploads\/2023\/02\/Simulation_Zenerdiode-100x74.png 100w, https:\/\/medtech-ingenieur.de\/wp-content\/uploads\/2023\/02\/Simulation_Zenerdiode-150x111.png 150w, https:\/\/medtech-ingenieur.de\/wp-content\/uploads\/2023\/02\/Simulation_Zenerdiode-200x149.png 200w, https:\/\/medtech-ingenieur.de\/wp-content\/uploads\/2023\/02\/Simulation_Zenerdiode-450x334.png 450w, https:\/\/medtech-ingenieur.de\/wp-content\/uploads\/2023\/02\/Simulation_Zenerdiode-600x446.png 600w, https:\/\/medtech-ingenieur.de\/wp-content\/uploads\/2023\/02\/Simulation_Zenerdiode-900x668.png 900w, https:\/\/medtech-ingenieur.de\/wp-content\/uploads\/2023\/02\/Simulation_Zenerdiode.png 905w\" sizes=\"auto, (max-width: 300px) 100vw, 300px\" \/><\/p>\n<p>If anyone wants to delve deeper into the topic of circuit simulation, I can recommend the book \u201cInside Spice\u201d by Ron Kielkowski.<br \/>\nThe book describes how Spice works, the differences between the various simulation types (AC, Operating Point, Transient, etc.), and how to handle non-convergent circuits. His clearly defined approach is particularly helpful. For convergence problems in transient analysis, for example, he suggests varying the RELTOL, VNTOL, and ABSTOL parameters (starting on page 53).<\/p>\n<p>Its algorithm for selecting parameters is:<\/p>\n<ol>\n<li>RELTOL usually fits with 0.001 (0.1%).<\/li>\n<li>VNTOL = RELTOL * V_small, where V_small is the smallest voltage in the circuit (e.g. an opamp offset voltage).<\/li>\n<li>ABSTOL = RELTOL * I_small, where I_small is the smallest current that is relevant, e.g. the leakage current of a diode.<\/li>\n<li>The values can then be added to the simulation via options, for example: .OPTIONS RELTOL=.0001 VNTOL=.0001V ABSTOL=10NA<\/li>\n<\/ol>\n<p>Following this pattern, there are tips for various problems related to SPICE simulations.<br \/>\nMaybe these tips will help with convergence problems occasionally.<\/p>\n<p>Good luck with the simulation<br \/>\nMartin Bosch<\/p>","protected":false},"excerpt":{"rendered":"<p>LTspice als Software zur Schaltungssimulation ist wahrscheinlich jedem Hardware-Entwickler bekannt. Der Kopf hinter LTspice war Mike Engelhardt, was wahrscheinlich auch viele wissen, da er viele Jahre die LTspice World Tour gemacht hat und Seminare zu LTspice gehalten hat. Bei &#8222;The Amp Hour Electronics Podcast&#8220; gibt es eine Episode aus dem Jahr 2014, die ich jedem [&hellip;]<\/p>\n","protected":false},"author":2,"featured_media":7574,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[13,4,8],"tags":[359,362,441],"class_list":["post-7566","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-buchtipps","category-hardware-entwicklung","category-tools","tag-ltspice","tag-schaltungssimulation","tag-spice","post-wrapper","thrv_wrapper"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.4 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>LTspice - was tun, wenn die Simulation nicht konvergiert - MEDtech Ingenieur GmbH<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/medtech-ingenieur.de\/en\/ltspice-was-tun-wenn-die-simulation-nicht-konvergiert\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"LTspice - was tun, wenn die Simulation nicht konvergiert - MEDtech Ingenieur GmbH\" \/>\n<meta property=\"og:description\" content=\"LTspice als Software zur Schaltungssimulation ist wahrscheinlich jedem Hardware-Entwickler bekannt. Der Kopf hinter LTspice war Mike Engelhardt, was wahrscheinlich auch viele wissen, da er viele Jahre die LTspice World Tour gemacht hat und Seminare zu LTspice gehalten hat. Bei &#8222;The Amp Hour Electronics Podcast&#8220; gibt es eine Episode aus dem Jahr 2014, die ich jedem [&hellip;]\" \/>\n<meta property=\"og:url\" content=\"https:\/\/medtech-ingenieur.de\/en\/ltspice-was-tun-wenn-die-simulation-nicht-konvergiert\/\" \/>\n<meta property=\"og:site_name\" content=\"MEDtech Ingenieur GmbH\" \/>\n<meta property=\"article:publisher\" content=\"https:\/\/www.facebook.com\/medtechIngenieur\" \/>\n<meta property=\"article:author\" content=\"https:\/\/www.facebook.com\/medtechIngenieur\/\" \/>\n<meta property=\"article:published_time\" content=\"2023-02-28T20:14:28+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/medtech-ingenieur.de\/wp-content\/uploads\/2023\/02\/Simulation_Zenerdiode.png\" \/>\n\t<meta property=\"og:image:width\" content=\"905\" \/>\n\t<meta property=\"og:image:height\" content=\"672\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/png\" \/>\n<meta name=\"author\" content=\"Martin Bosch\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:creator\" content=\"@https:\/\/twitter.com\/MedtechIng\" \/>\n<meta name=\"twitter:site\" content=\"@MedtechIng\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"Martin Bosch\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"2 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\\\/\\\/medtech-ingenieur.de\\\/ltspice-was-tun-wenn-die-simulation-nicht-konvergiert\\\/#article\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/medtech-ingenieur.de\\\/ltspice-was-tun-wenn-die-simulation-nicht-konvergiert\\\/\"},\"author\":{\"name\":\"Martin Bosch\",\"@id\":\"https:\\\/\\\/medtech-ingenieur.de\\\/#\\\/schema\\\/person\\\/4a6ce76ff044f5fc88a30484c695fd84\"},\"headline\":\"LTspice &#8211; 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Sein Fachgebiet umfasst die Entwicklung von Embedded Elektronik, speziell f\u00fcr medizinische Anwendungen. Dabei liegt sein Fokus auf dem Design von Leiterplatten und Schaltungen, die sowohl Mikrocontroller als auch analoge Schaltungstechnik integrieren. 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