5. (5 points) For a common-source transistor with a source resistor Rs

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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.

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(5 points) For a common-source transistor with a source resistor $R_{s}$ and loading resistor $R_{D}$ , as shown in the following figure, what is the input resistance $R_{in}$ and the voltage gain $v_{o} / v_{sig}$ . Here the NMOS transistor is modeled with $g_{m}$ only.