In the circuit in Figure, the input voltages vX and vY are compatible with the output voltages vO1 and vO2. Neglect base currents.
(a) Design an appropriate value of VR. State the reason for your selection.
(b) Determine the value of RC1 such that, when Q1 is on, the current in RC1 is one-half that in D1.
(c) Determine the value of RC2 such that, when Q2 is on, the current in RC2 is one-half that in D2.
(d) Calculate the power dissipated in the circuit when vX = vY = logic 0.