Comments on: Sallen and Key filter puzzle with LTspice https://www.electronicsweekly.com/blogs/engineer-in-wonderland/sallen-and-key-filter-puzzle-with-ltspice-2024-09/ Electronics Design & Components Tech News Tue, 03 Sep 2024 18:45:04 +0000 hourly 1 https://wordpress.org/?v=6.2.2 https://www.electronicsweekly.com/wp-content/themes/ew/images/logo.gif Electronics Weekly https://www.electronicsweekly.com/blogs/engineer-in-wonderland/sallen-and-key-filter-puzzle-with-ltspice-2024-09/ 125 75 Electronics Design & Components Tech News By: Mike Bryant https://www.electronicsweekly.com/blogs/engineer-in-wonderland/sallen-and-key-filter-puzzle-with-ltspice-2024-09/#comment-1529705 Tue, 03 Sep 2024 18:45:04 +0000 https://www.electronicsweekly.com/?p=847623#comment-1529705 First guess was asymmetric input offset current but they are in the pA.

However rail to rail outputs are never quite that, but this one seems to be further out on VOH than VOL which would give the opposite to what you have. Try putting a 10k pullup and then make it a 10k pull down on the comparator output and see if either changes things.

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