Consider the BiCMOS input stage of the CA3140 op-amp in Figure 13.21. Transistor can be replaced with a constant-current source of 200 µA. Assume: bipolar transistor parameters of β= 200,IE0 = 10-14 A, and VA = 50 V-1; and MOSFET parameters of Kp = 0.6 mA/V2,\VTP\ = 1 V, and λ = 0.01 V-1. Using an appropriate ac load at the collector of Qn, determine the differential gain of the input stage. Compare the computer analysis results with those in Example 13.12.
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