4. (5 points) Design the circuit below to establish a drain voltage of 0.1 V. What is the effective resistance between drain and source at this operating point? Let Vt = 0.5 V and μnCox(W/L) = 2 mA/V2.
5. (5 points) For a common-source transistor with a source resistor Rs and loading resistor RD, as shown in the following figure, what is the input resistance Rin and the voltage gain vo/vsig . Here the NMOS transistor is modeled with gm only.
