{"id":348270,"date":"2024-02-01T14:00:12","date_gmt":"2024-02-01T14:00:12","guid":{"rendered":"\/forum\/forums\/reply\/348270\/"},"modified":"2024-02-01T14:00:12","modified_gmt":"2024-02-01T14:00:12","slug":"348270","status":"publish","type":"reply","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/reply\/348270\/","title":{"rendered":"Reply To: S-parameter causality issue"},"content":{"rendered":"<p>&lt;p&gt;Its not directly related to causality, but numerics can play a part in it, but you&#8217;ve got way more points in your decade sweep than I would normally use.&nbsp;Also, I would stop the decade sweep at 10MHz.&lt;\/p&gt;&lt;p&gt;My usuall set up is two sweep.&nbsp;&lt;\/p&gt;<\/p>\n<ul>\n<li>A 10MHz linear step sweep starting at 0 Hz (so you don&#8217;t need a separate line just for the DC point) going up to the max frequency.<\/li>\n<li>Then a 10 points per decade sweep from 100 Hz (Though that depends on the application. If it is a PDN, then I might start at 1 Hz to be safe.) to 10MHz.&nbsp;<\/li>\n<\/ul>\n<p>&lt;p&gt;One more thing to double check, if you are using external s-parameter models for components, you should also run a causality test on those.&lt;\/p&gt;<\/p>\n","protected":false},"template":"","class_list":["post-348270","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=\"Its not directly related to causality, but numerics can play a part in it, but you&#039;ve got way more points in your decade sweep than I would normally use. Also, I would stop the decade sweep at 10MHz.My usuall set up is two sweep. 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