https://ez.analog.com/design-tools-and-calculators/precision-studio/f/q-aen-USTelligent Community 12Fri, 12 Jun 2026 17:58:10 GMThttps://ez.analog.com/thread/604759?ContentTypeID=0Fri, 12 Jun 2026 17:58:10 GMTa884d118-f55f-49de-87eb-b9dbaf99b3e3:ee58365f-664a-4fad-aab4-37597a6cde52AresLee2https://ez.analog.com/thread/604759?ContentTypeID=0https://ez.analog.com/design-tools-and-calculators/precision-studio/f/q-a/604759/the-simulation-results-displayed-online-by-analog-filter-wizard-are-quite-different-from-those-of-ltspice-for-my-selected-op-amp/rss?ContentTypeId=0<p>Hi all,</p> <p></p> <p><span>I needed to design a unity gain 4th order Bessel Sallen-Key low-pass filter with a -3dB cutoff frequency of 1.59MHz.</span></p> <p><span> When entering the Analog Filter Wizard webpage, I first selected the &quot;Low Noise&quot; optimization option in the &quot;Pick for me&quot; mode. The software selected ADA4857-1 for me. Then I changed to the &quot;I want to choose&quot; mode and adjusted the &quot;RC Sizing&quot;. Then I set the capacitance accuracy to 1%, the resistance accuracy to 0.1%, and then exported the SPICE file. The simulation results in LTspice are basically the same as those on the web page. Then I changed the op amp of the first 2nd order SK&nbsp;</span><span>filter to the AD8029, and then exported it to LTspice simulation. I found that the final -3dB cut-off frequency was about 1.56MHz, which has a little error. But the fp of the first-stage SK filter is about 2.08MHz, which is quite different from the 2.17~2.22M in the webtool&#39;s Stages View. Is this&nbsp;difference reasonable?</span></p> <p><span></span></p> <p><span>Thanks.</span></p> <p></p> <p><span>&nbsp;<img style="max-height:240px;max-width:320px;" alt=" " src="https://ez.analog.com/resized-image/__size/640x480/__key/communityserver-discussions-components-files/1212/3730.F1.png" />&nbsp; &nbsp;&nbsp;<img style="max-height:240px;max-width:320px;" alt=" " src="https://ez.analog.com/resized-image/__size/640x480/__key/communityserver-discussions-components-files/1212/5621.F2.png" /></span></p><div style="clear:both;"></div>https://ez.analog.com/thread/603018?ContentTypeID=0Thu, 26 Feb 2026 13:32:51 GMTa884d118-f55f-49de-87eb-b9dbaf99b3e3:d99f78c4-5174-496d-8c07-a7bc3ed56396david.plourde1https://ez.analog.com/thread/603018?ContentTypeID=0https://ez.analog.com/design-tools-and-calculators/precision-studio/f/q-a/603018/do-you-have-videos-or-app-notes-where-i-can-learn-more-about-precision-studio/rss?ContentTypeId=0<p>Do you have videos or app notes where I can learn more about Precision Studio?</p><div style="clear:both;"></div>https://ez.analog.com/thread/603017?ContentTypeID=0Thu, 26 Feb 2026 13:30:48 GMTa884d118-f55f-49de-87eb-b9dbaf99b3e3:e8305a97-2a8d-4d87-89f4-22954119757cdavid.plourde1https://ez.analog.com/thread/603017?ContentTypeID=0https://ez.analog.com/design-tools-and-calculators/precision-studio/f/q-a/603017/do-precision-studio-tools-consider-component-tolerances/rss?ContentTypeId=0<p>Do Precision Studio tools consider component tolerances?</p><div style="clear:both;"></div>https://ez.analog.com/thread/603015?ContentTypeID=0Thu, 26 Feb 2026 13:27:39 GMTa884d118-f55f-49de-87eb-b9dbaf99b3e3:c44ed5da-266c-473f-a223-040b0fcf22a9david.plourde1https://ez.analog.com/thread/603015?ContentTypeID=0https://ez.analog.com/design-tools-and-calculators/precision-studio/f/q-a/603015/can-i-save-or-share-my-work/rss?ContentTypeId=0<p>Can I save or share my work?</p><div style="clear:both;"></div>https://ez.analog.com/thread/603014?ContentTypeID=0Thu, 26 Feb 2026 13:25:45 GMTa884d118-f55f-49de-87eb-b9dbaf99b3e3:59584b60-98d4-4306-be50-f6c0eb38ab66david.plourde1https://ez.analog.com/thread/603014?ContentTypeID=0https://ez.analog.com/design-tools-and-calculators/precision-studio/f/q-a/603014/can-i-suggest-features-or-report-bugs-found-in-the-tools/rss?ContentTypeId=0<p>Can I suggest features or report bugs found in the tools?</p><div style="clear:both;"></div>https://ez.analog.com/thread/603012?ContentTypeID=0Thu, 26 Feb 2026 13:19:57 GMTa884d118-f55f-49de-87eb-b9dbaf99b3e3:4603e08d-0552-4fa8-812e-1013ace291fddavid.plourde1https://ez.analog.com/thread/603012?ContentTypeID=0https://ez.analog.com/design-tools-and-calculators/precision-studio/f/q-a/603012/a-part-i-want-to-use-is-not-available-in-the-tool-i-am-using-how-could-i-get-it-added/rss?ContentTypeId=0<p>A part I want to use is not available in the tool I am using. How could I get it added?</p><div style="clear:both;"></div>https://ez.analog.com/thread/603011?ContentTypeID=0Thu, 26 Feb 2026 13:17:55 GMTa884d118-f55f-49de-87eb-b9dbaf99b3e3:7d2f05fb-a0c7-4d99-972e-8eae997d4bf2david.plourde1https://ez.analog.com/thread/603011?ContentTypeID=0https://ez.analog.com/design-tools-and-calculators/precision-studio/f/q-a/603011/which-precision-studio-tools-export-to-ltspice/rss?ContentTypeId=0<p>Which Precision Studio tools export to LTspice?</p><div style="clear:both;"></div>https://ez.analog.com/thread/603010?ContentTypeID=0Thu, 26 Feb 2026 13:15:41 GMTa884d118-f55f-49de-87eb-b9dbaf99b3e3:6ca7d215-5b85-4ace-b17b-5ae1b130d4efdavid.plourde1https://ez.analog.com/thread/603010?ContentTypeID=0https://ez.analog.com/design-tools-and-calculators/precision-studio/f/q-a/603010/what-is-precision-studio/rss?ContentTypeId=0<p>What is Precision Studio?</p><div style="clear:both;"></div>