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- 1. TEST EEC 244: ELECTRONICS III TYPE A DATE: 8, DECEMBER 2020. TIME: 45MINS 1. List five characteristics of ideal operational amplifier 5 marks 2. Draw a well labeled diagram of integrated-circuit operational amplifier. 5 marks 3. i. Derive the expression for the output voltage of a summing amplifier Vin3 RF Rin3 Vout + _ V- V+ Vin2 Rin2 Vin1 Rin1 Iin1 Iin2 Iin3 Vin3 RF Rin3 Vout + _ V- V+ Vin2 Rin2 Vin1 Rin1 Iin1 Iin2 Iin3 If Fig 1 ii. Determine the final value of the output Vout if Vin1= 2mV, Vin2= 5mV, Vin3= 7mV, Rin1= 1kΩ, Rin2 = 2 kΩ, Rin3= 3 kΩ, Rf= 10 kΩ. 15 marks 4. State the conditions necessary for oscillations to occur according to Barkhausen’s. 5 marks TEST EEC 244: ELECTRONICS III TYPE B DATE: 8, DECEMBER 2020. TIME: 45MINS 1. List five (5) application of operational amplifier. 5 marks 2. State five (5) advantages of a negative feedback amplifier. 5 marks 3. State the expression for the following in feedback amplifier: i. Input impedance ii. Output impedance iii. Distortion iv. Noise v. Feedback gain 10 marks 4. i. Prove that inverting amplifier op-amp has a gain Av of – from fig 1. 5 marks Fig 1 ii. Determine the final value of the output Vout if Vin= 5v, Rin = 5 kΩ and Rf=15 kΩ. 5 marks TEST EEC 244: ELECTRONICS III TYPE A DATE: 8, DECEMBER 2020. TIME: 45MINS 5. List five characteristics of ideal operational amplifier 5 marks 6. Draw a well labeled diagram of integrated-circuit operational amplifier. 5 marks 7. iii. Derive the expression for the output voltage of a summing amplifier Vin3 RF Rin3 Vout + _ V- V+ Vin2 Rin2 Vin1 Rin1 Iin1 Iin2 Iin3 Vin3 RF Rin3 Vout + _ V- V+ Vin2 Rin2 Vin1 Rin1 Iin1 Iin2 Iin3 If Fig 1 iv. Determine the final value of the output Vout if Vin1= 2mV, Vin2= 5mV, Vin3= 7mV, Rin1= 1kΩ, Rin2 = 2 kΩ, Rin3= 3 kΩ, Rf= 10 kΩ. 15 marks 8. State the conditions necessary for oscillations to occur according to Barkhausen’s. 5 marks TEST EEC 244: ELECTRONICS III TYPE B DATE: 8, DECEMBER 2020. TIME: 45MINS 5. List five (5) application of operational amplifier. 5 marks 6. State five (5) advantages of a negative feedback amplifier. 5 marks 7. State the expression for the following in feedback amplifier: vi. Input impedance vii. Output impedance viii. Distortion ix. Noise x. Feedback gain 10 marks 8. iii. Prove that inverting amplifier op-amp has a gain Av of – from fig 1. 5 marks Fig 1 iv. Determine the final value of the output Vout if Vin= 5v, Rin = 5 kΩ and Rf=15 kΩ. 5 marks