Amplifier circuit - NMOS mode of operation? Gain?
For the transistor:

$$V_{DS}=V_{in}$$

$$V_{GS}= \frac{V_P-V_{in}}{2}$$

Saturation condition becomes:

$$\frac{3V_{in}}{2}\geq\frac{V_P}{2}-V_T$$

Given that \$\frac{V_P}{2}&gt; V_T\$ (condition for transistor to be ON), and assuming that the DC voltage at the non-inverting input of the amplifier \$V_{in}=0\$, the above saturation condition can't be satisfied.