Hi! I want to measure noise of my LDOs (just for fun). So, I want to assemble a low-noise amp that would amplify noise. My understanding is there should be a lot of shielding, preferably the whole measurement setup. Or at least LNA and cables should be shield. And I have a few question how to do it properly, or what are best practices. I have no previous experience with shielding.
To some questions I found answers on the Internet, but I'd like to confirm.
1) Should LNA's shield be earthed? I read conflicting opinions on this (or I misunderstood)
2) Should the shield be connected to LNA's "ground"?
3) Can I use BNC/SMA connectors (with single conductor inside the cable) to connect DUT or I need a cable with two conductors that are shielded? (I've seen both used)
4) What if a shield consists of multiple isolated pieces of foil? If this is not ok, should I connect pieces of the shield in multiple points, or it's enough to connect it in one point?
5) Are shield material and thickness important? Can I use food aluminum foil? Or copper foil be better?