An NMOS differential amplifier employing equal drain resistors, Rd = 47 ohm, 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 lowest value that Vdd must have to ensure saturation -mode for Q1 and Q2 at all times? Assume Vt = 0.5 V.