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8.8 Consider the basic bipolar current mirror of Fig. 8.7 for the case in which Q1 and Q2 are identical devices having IS = 10−17A. (a) Assuming the transistor β is very high, find the range of V BE and IO corresponding to IREF increasing from 10 μA to 10 mA. Assume that Q2 remains in the active mode, and neglect the Early effect. (b) Find the range of IO corresponding to IREF in the range of 10 μA to 10 mA, taking into account the finite β. Assume that β remains constant at 100 over the current range 0.1 mA to 5 mA but that at IC 10 mA and at IC 10 μA, β =50. SpecifyIO corresponding toIREF =10 μA, 0.1 mA, 1 mA, and 10 mA. Note that β variation with current causes the current transfer ratio to vary with current.