I just finished with theory understanding of FET transistor principles, etc.
Right after that I tried to make simple circuit Common-Source with FET and MOSFET the problems occurred one by another.
I could begin with JFET (n-channel) for start:
- Idss (when Vds = 15V) = 6mA
- Vgss(off) (when Vds = 15V & Id = 10nA) = from -0.5V to -8V
- Different admittances at Vgs = 0 and I don't know which to chose for calculating Id
All I wanted was to bias the FET, so that Vds = Vdd/2, so in the middle of the load line (for the start). Vdd would be 20V and Id would be 5mA > Vds would then be 10V, right?
I can't find appropriate Vgs and also don't know how to connect gate resistor (series or parallel) + I can't calculate its value since gate current cant be calculated and/or is not practically usable (neglected).
Transistor's datasheet: www.mouser.com/ds/2/149/bf244a-292510.pdf