{"id":346788,"date":"2024-01-26T14:59:53","date_gmt":"2024-01-26T14:59:53","guid":{"rendered":"\/forum\/forums\/reply\/346788\/"},"modified":"2024-01-26T14:59:53","modified_gmt":"2024-01-26T14:59:53","slug":"346788","status":"publish","type":"reply","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/reply\/346788\/","title":{"rendered":"Reply To: ANSYS Electronics Circuit:Transient analysis error"},"content":{"rendered":"<p>&lt;p&gt;The s-parameter rejection is due to the state-space (the method by which we solve s-parameters in the time domain) fitting error is greater than 10%. That is a very strong indicator that the model is behaving in a non-physical manner. I would recommend running the causality checker in the Network Data Explorer to see if if flaggs the model as non-causal.&nbsp;&lt;\/p&gt;&lt;p&gt;Though you had mentioned this being based on an LNA simulation. Undersampeld frequency domain data can often appear as numerically non-causal. On a related note, the no DC point warning is coming from the same s-parameter model. What was the frequency sweep settings for the LNA that crated this?&nbsp;&lt;\/p&gt;<\/p>\n","protected":false},"template":"","class_list":["post-346788","reply","type-reply","status-publish","hentry"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 4.9.10 - aioseo.com -->\n\t<meta name=\"description\" content=\"The s-parameter rejection is due to the state-space (the method by which we solve s-parameters in the time domain) fitting error is greater than 10%. That is a very strong indicator that the model is behaving in a non-physical manner. I would recommend running the causality checker in the Network Data Explorer to see if\" \/>\n\t<meta name=\"robots\" content=\"max-image-preview:large\" \/>\n\t<link rel=\"canonical\" href=\"https:\/\/innovationspace.ansys.com\/forum\/forums\/reply\/346788\/\" \/>\n\t<meta name=\"generator\" content=\"All in One SEO (AIOSEO) 4.9.10\" \/>\n\t\t<meta property=\"og:locale\" content=\"en_US\" \/>\n\t\t<meta property=\"og:site_name\" content=\"Ansys Learning Forum | Ansys Innovation Space\" \/>\n\t\t<meta property=\"og:type\" content=\"article\" \/>\n\t\t<meta property=\"og:title\" content=\"Reply To: ANSYS Electronics Circuit:Transient analysis error | Ansys Learning Forum\" \/>\n\t\t<meta property=\"og:description\" content=\"The s-parameter rejection is due to the state-space (the method by which we solve s-parameters in the time domain) fitting error is greater than 10%. That is a very strong indicator that the model is behaving in a non-physical manner. I would recommend running the causality checker in the Network Data Explorer to see if\" \/>\n\t\t<meta property=\"og:url\" content=\"https:\/\/innovationspace.ansys.com\/forum\/forums\/reply\/346788\/\" \/>\n\t\t<meta property=\"article:published_time\" content=\"2024-01-26T14:59:53+00:00\" \/>\n\t\t<meta property=\"article:modified_time\" content=\"2024-01-26T14:59:53+00:00\" \/>\n\t\t<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n\t\t<meta name=\"twitter:title\" content=\"Reply To: ANSYS Electronics Circuit:Transient analysis error | Ansys Learning Forum\" \/>\n\t\t<meta name=\"twitter:description\" content=\"The s-parameter rejection is due to the state-space (the method by which we solve s-parameters in the time domain) fitting error is greater than 10%. That is a very strong indicator that the model is behaving in a non-physical manner. 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