<html><head><meta http-equiv="Content-Type" content="text/html; charset=us-ascii"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; line-break: after-white-space;" class=""><div class=""><div><br class=""><blockquote type="cite" class=""><div class="">On 30 Oct 2019, at 23:57, Mattias Rickardsson <<a href="mailto:mr@analogue.org" class="">mr@analogue.org</a>> wrote:</div><br class="Apple-interchange-newline"><div class=""><div dir="auto" class=""><div class=""><div class="gmail_quote"><div dir="ltr" class="gmail_attr">Den ons 30 okt. 2019 22:49Ben Stuyts <<a href="mailto:ben@stuyts.nl" class="">ben@stuyts.nl</a>> skrev:<br class=""></div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div style="word-wrap:break-word;line-break:after-white-space" class=""><div class=""><div class=""><div class="">... So if you have the budget, go for some SMPS to generate pos and neg and followed with some analog regulators.</div></div></div></div></blockquote></div></div><div dir="auto" class=""><br class=""></div><div dir="auto" class="">How likely is a linear regulator to properly suppress the high-frequency noise from SMPS?</div></div></div></blockquote><div><br class=""></div>It needs to be addressed carefully indeed. Put an LC filter on the input, for starters. Ripple rejection of the LT3088 I mentioned is between 35 - 85 dB depending on load, frequency, etc. Maybe there are better ones. The DC/DC converter that Neil mentioned switches at ca. 250 kHz, where rejection is at the low end (35 dB or so).<div class=""><br class=""></div><div class="">Ben<br class=""></div><div class=""><br class=""></div></div></div></body></html>