申論題

4. (15%) Consider the yoltage amplifier of Fig. 4 with a MOSFET specified to have Vt=  1.5 V, (WIL) = 0.5 mArV², andλ = 0.02. The coupling capacitors C can block DC component and pass AC component. Calculate (a) the small-signal voltage gain (b) its input resistance , and (O) the largest allowable input signal. (5%*3)