u/sketchreey

Hi, for purposes of building RF switches in HF band, is it just me or do PIN diode datasheets not contain any useful information? E.g one out of ten I found had a plot for Ron vs frequency, and not a single one mentioned the minority carrier lifetime at all.

Of course this probably isnt every datasheet, but has anyone else noticed this trend?

And also, for people who have made ham frequency switches with these, how do you pick them if they dont mention anything in the datasheet?

Hi, I see a lot of designs of (basically) SDRs and stuff that use active mixers such as ADL5801/ADL5802/LT5560/etc, and not a lot of modern designs that use single or double balanced diode mixers.

Why is this? I get that the active mixers have gain and diode mixers don't so they would have terrible noise figure if not amplified first, but why not just put an LNA followed by a diode ring mixer?

Edit: For example, Henrik Forsten seems to basically only use active mixers:

Hi, this might not be the right place to ask this, but I am simulating a PRS in HFSS (ansys electronics desktop student 2025R2 to be precise), and it is fine except that I seem to be missing one of the tabs for the floquet port?

What I expect to see (https://ansyshelp.ansys.com/public/Views/Secured/Electronics/v252/en/PDFs/HFSS%20Floquet%20Ports.pdf)

What I am getting

Anyone know why this is the case? I hope it isn't simply because I am using the student version, but maybe it is?