(a) Suppose that at T 5 25 8C a certain pnp BJT has Is 5 2 fA and VA 5 50 V. Find the value of VEB (in mV) needed to ensure IC 5 500 A at VEC 5 4.0 V. (b) What happens to IC if VEC is reduced to 1.0...

(a) Suppose that at T 5 25 8C a certain pnp BJT has Is 5 2 fA and VA 5 50 V. Find the value of VEB (in mV) needed to ensure IC 5 500 A at VEC 5 4.0 V. (b) What happens to IC if VEC is reduced to 1.0 V? Raised to 8 V? (c) What is the mV value of VEB needed to ensure IC 5 0.2 mA at T 5 75 8C and VEC 5 4.0 V? (d) Suppose VEB and VEC are kept at the values of (a), while T is raised from 25 8C to 55 8C. What is the new value of IC? Hint: start out with the value of VEB found in part (a), and use the rules of thumb to make your estimates.