(a) For the amplifier circuit shown in panel (a), M2 is implemented as a diode-connected NMOS. (W/L)1 = 50 μm/0.5 μm, (W/L)2 = 10 μm/0.5 μm, both M1 and M2 are in saturation with IDS1 = IDS2 = 0.5 mA. Calculate the small-signal voltage gain. (b) Everything remains the same except that M2 is now implemented as a diode-connected PMOS. Calculate the small-signal voltage gain.