Consider the bias circuit portion of the 741 op-amp in Figure 13.5. Assume transistor parameters of Is = 5 × 10–16 A. Neglect base currents, (a) Redesign the circuit such that IREF = 0.5 mA and IC10 = 30 µA for bias voltages of ±15 V. What are the values of VBE11, VEBU, and VBE10.? (b) Using the resistor values found in part (a) and assuming VBE(on) = VEB (on) = 0.6 V, determine the values of IREF and IC10. (C) What are the percent differences in the current values between parts (a) and (b).
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