Question

An amplifier circuit is shown in Fig. 1b. The operational amplifier (op-amp) Ai can be assumed as ideal. The input impedance of this amplifier is 1M2. The gain of this amplifier is -100. R2 V R VVV 小小 Ri Fig. 1b (a) Show that 12 = (b) Find the expression of the voltage gain, Av, in terms Ri, R, R3 and R4. (c) Due to practical reasons, the maximum value to be used for the resistors is set at 1M2. Based on the given design constraint, determine the values for Ri, R, Rs and R4

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4、4 Osi 2 3R2 R 2, FL 2, R U0 R, R3 R, R

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