Am 23.12.2019 um 16:03 schrieb jimlux:
It is tough to build a "small" input filter that has good rejection at low frequencies (<100kHz?)
Yes if you want a passive filter, but you can view an LDO as an active low-pass in some sense. Again you need to take care that noise cannot bypass it, but most of it should be conducted noise in the LF case. Active filtering is also a good option if the power you need to deliver is low.
Buck converter to 8V (boost converters seem to have more noise)
That again depends on topology and control type. The canned converters are almost always optimized to have the lowest number of switches and work with cheap magnetics (single coil) without easily entering problematic operation modes, noise is only a secondary concern. Producing less noise in the first place is possible if you change those constraints; i.e. allow more switches, more complicated energy storage (capacitors and magnetics) or employ control algorithms that are less robust and hence need to be tuned to the load to be stable.
-- Achim. (on the road :-) _______________________________________________ time-nuts mailing list -- time-nuts@lists.febo.com To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com and follow the instructions there.
