12.1 A class A emitter follower, biased using the circuitshown in Fig. 12.3, uses Vcc=10V, R = RL=\kQ., withall transistors (including Q3) identical. Assume V££ = 0.7 V, VC£sat = 0.3 V, and ft to be very large. For linear operation, what are the upper and lower limits of output voltage, andthe corresponding inputs? How do these values change if theemitter-base junction area of Q3 is made twice as big as thatof S2? Half as big?