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7.21 The purpose of this problem is to illustrate the application of graphical analysis to the circuit shown in Fig. P7.21. Sketch i C−vCE characteristic curves for the BJT for iB = 10 μA, 20 μA, 30 μA, and 40 μA. Assume the lines to be horizontal (i.e., neglect the Early effect), and let β =100. For V CC = 5 V and RC = 1 k, sketch the load line. What peak-to-peak collector voltage swing will result for iB varying over the range 10 μA to 40 μA? If the BJT is biased at V CE = 1 2 V CC, find the value of IC and IB. If at this current V BE = 0.7 V and if RB = 100 k, find the required value of V BB.