Answer Happy

i. Fig. QB1.a shows a non-inverting amplifier. The circuit is to be designed for an input resistance of 10kn, and output resistance of 1000, and closed loop voltage gain of 20. When the output voltage is 10V, the current through RF and R1 is to be 0.2mA. Specify the value of resistors in the circuit. [8 Marks) Vi + RO . Vo Ri RF R1 Fig. QB1.a ii. Fig. QB1.b shows a 4 input inverting summer. The circuit is to be designed for an output voltage given by Vo = -(2*V11 + 4"V12 + 6*Vi3 + 8*Vi4). When the output voltage is 10V, the current through RF is to be 0.5mA. Specify the value of the resistors R1, R2, R3, R4, RF in the circuit. [6 Marks) R1 Vi1- RF R2 Vi2 R3 Vo Vi3 + R4 Vi4.
For the circuit shown in Fig. QB1.c: a. Assuming Vi1 = 0.5V, Vi2 = 0.2V, calculate the output voltage, Vo. [4 Marks) b. Design a circuit by using only one op-amp to replace the circuit in Fig. QB1.c and determine the value of the resistors you used in your design [7 Marks)