Our design uses electronic keys for switching very weak and relatively low frequency currents. And it is very important that its capacitance Coff (source/drain; RFx/ RFC) would be 0,1...0,2 pF, range begin with 0 Hz (DC)… to a few kHz, and it would have low charge injection.
I am currently using MOS FET Relays and going to try MEMS RF Switches (probably ADGM1304). But maybe there are ‘simple’ RF switches suitable, e.g. HMC or ADG series? I tried ADG1211 but its off capacitance is more than necessary (1pF).
I will appreciate your advice.