(a) Assume the bias circuit of the CA3140 op–amp circuit shown in Figure 13.22 has supply voltages of V+ = 5 V and V– = –5 V.Let R1, = 10kΩ. The transistor parameters are VTp =–0.8 V and Kp = 0.15 mA/V2 for M8; and VB E7(on) = VEB6 = 0.6V for the bipolars. Find the currents I1and 12;and the voltages VSG8, VC7, VC6 VCB7,and VBC6(b) Using the results of part (a), determine the minimum supply voltages that will still maintain the bipolar transistors biased in the forward active region. Assume V+ = –V . (Ans. (a) I1 =l2 = 0.1028 mA, VSG8 = 1.628 V, VC7 =3.8V, VC6 = –3.37 V, VCB7 = VBC6 =7.17V; (b)V+ = –V– = 1.414 V)
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