9.16 An NMOS differential amplifier employing equal drain resistors, RD = 47 k, has a differential gain Ad of 20 V/V. (a) What is the value of gm for each of the two transistors? (b) If each of the two transistors is operating at an overdrive voltage VOV = 0.2 V, what must the value of I be? (c) For vid = 0, what is the dc voltage across each RD? (d) If vid is 20-mV peak-to-peak sine wave applied in a balanced manner but superimposed on VCM = 0.5 V, what is the peak of the sine-wave signal at each drain? (e) What is the lowest value that VDD must have to ensure saturation-mode operation for Q1 and Q2 at all times? Assume V t = 0.5 V.