I need help with Sedra and Smith 6th edition D10.39 The active-loaded differenti
ID: 1800566 • Letter: I
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I need help with Sedra and Smith 6th edition D10.39
The active-loaded differential amplifier in Fig. P10.39 has a feedback network consisting of the voltage divider (R1, R2), with R1+R2= 1 M Ohm. The devices are sized to operate at |VOV| = 0.2 V. For all devices, |VA| = 10 V. The input signal source has a zero dc component. Show that the feedback is negative. What do you expect the dc voltage at the gate of Q2 to be? At the output? (Neglect the Early effect.) Find the A circuit. Derive an expression for A and find its value. Select values for R1 and R2 to obtain a closed-loop voltage gain Vo/Vi = 5 V/V. Find the value of Rout. Utilizing the open-circuit, closed-loop gain (5 V/V) and the value of Rout found in (e), find the value of gain obtained when a resistance RL = 10 k Ohm is connected the output. As an alternative approach to (f) above, redo the analysis of the A circuit including RL. Then utilize the values of R1 and R2 found in (d) to determine beta and A1. Compare the value of Af to that found in (f).Explanation / Answer
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