To determine the value of a small-signal resistance in a simulation, the circuit seen in Fig. 9.41 is used. The ratio of the test voltage, v T , to the current that flows in the source, I T , that is,...

To determine the value of a small-signal resistance in a simulation, the circuit seen in Fig. 9.41 is used. The ratio of the test voltage, v
_T, to the current that flows in the source, I
_T, that is, v
_T/I
_T, is the small signal resistance. Using this circuit determine, with SPICE, the value of the resistance looking into the drain of the circuit in Fig. 9.40. How does the 200k resistor affect I
_T
in the simulation?