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i need help with these four questions
R3 BC327 Q3 c3 Vg5 R10 MS IRFZ14 ci R6 100 VDD1 V3 Q1 BC107A Q2 BC107A 1 F Ri RS RVI {RBIAS) 20V 04 BC337 사 C2 Rload R4 1F R7 470 V2 는 Vg6 R11 100 IRFU9010 M6 VDD2 R8 Figure 1 - Amplifier circuit diagram a) Assuming that I = 10 mA (where la is the current into the collector of Q1), determine the nearest preferred values (NPV) for the resistors R3 and R4 in the input stage of the power amplifier to ensure a voltage at the output of the long-tailed pair that is approximately 600 mV below the positive supply voltage. b) Using a value of 470 n for R7, determine the values for R8 and RV1 so that with an la of 20 mA (where la is the current into the collector of Q3), there is a quiescent current of approximately 50 mA flowing through the output MOSFET stages, and the output voltage is at (or very close) to zero volts. Use the model characteristics for the MOSFETs given in Appendix A of this lab script. (For this question, determine the optimum values for RV1, and the closest E24 value for R8.) c) Determine the unloaded gain of each stage of the power amplifier, and estimate the loading effect of the subsequent stages on the differential amplifier for B (he) values of Q3 of 100 (worst case), 200 (average). and 600 (best case) at low frequencies. How do you think this might change at higher frequencies? d) Based on your results above, choose suitable values for the resistors R1, RS and R6 to satisfy the low frequency cut-off, gain and output offset voltage specifications for the amplifier. Choose values from the E24 series of resistance values for these resistors.