a. Using the characteristics of Fig. 3.13a, determine b ac at I _B = 60 mA and V _{CE =} 4 V.
b. Repeat part (a) at I_{B =}30 μA and V_CE  =7 V.
c. Repeat part (a) at I_B = 10 μA and V_CE  = 10 V.
d. Reviewing the results of parts (a) through (c), does the value of b ac change from point to point on the characteristics? Where are the high values located? Can you develop any general conclusions about the value of b ac on a set of collector characteristics?
e. The chosen points in this exercise are the same as those employed in Problem 21. 

If Problem 21 was performed, compare the levels of b =dc and b ac for each point and comment on the trend in magnitude for each quantity.

Problem 21. 

Determine the average ac resistance for the characteristics of Fig. 3.10b

Fig. 3.10b

Transcribed Image Text:

HE (mA) 8 5 2 1 0.7 V 0.2 0.4 0.6 0.8 1 VBE (V) 4. 3.