Does anybody know how to build the coil inductor for small value such as 22nH? I want to use it for RF Transceiver in 315MHz frequency. what is the formula and material that i have to use to build it?
Very simple.
A jumper wire of thickness 0.8mm, 10mm long, core copper, can provide 10nH between two solder pads.
To create 22nH, simple make it 20mm long and coil a turn or two.
However, this can be lossy.
So you can use glue to melt around it to reduce loss and prevent it from oscillating (that can create some audible noise like "hissing")