Consider the input stage and bias circuit of the 741 op-amp in Figure 13.5. Transistor (2io may be replaced by a constant-current source equal to 19 µA. Assume: the npn devices have parameters β = 200 and VA = 150 V; the pnp devices have parameters β = 50 and VA — 50 V; and all transistors have Is = 10-14 A. Place an appropriate ac load at the collector of Q6. (a) Using a computer simulation, determine the differential voltage gain of the input stage, (b) Determine the differential-mode input resistance. (c) Determine the common-mode input resistance.
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