Hello.
I am trying to calculate the output impedance for the following circuit in SPICE notation (CS stage with drain-gate feedback):
- input signal vin 1 0
- output signal (output port, where impedance should be calculated) vout 3 0
- resistors rs 1 2 rf 2 3
- nmos (drain, gate, source, bulk) mosfet1 3 2 0 0
Unfortunately, I am getting odd results in SPICE, probably because the circuit I entered was missing the DC bias.
But, apart from SPICE, I would be mainly interested in the analytical solution as a function of rs and rf...
Can anyone help ?
Thanks !