Explanation: The output voltage, Vo = -[(Va+Vb+Vc)/3] = -[(3+5+7)/3] =-5v. 9. When does the offset voltage compensating network must be used in inverting configuration?
A. When the input is AC voltage
B. When the input is DC voltage
C. When the input is either AC or DC voltage
D. None of the mentioned
Answer:A
Explanation: The output voltage, Vo = -[(Va+Vb+Vc)/3] = -[(3+5+7)/3] =-5v. 9. When does the offset voltage compensating network must be used in inverting configuration?
A. When the input is AC voltage B. When the input is DC voltage C. When the input is either AC or DC voltage D. None of the mentioned
Explanation: To reduce the output offset voltage to zero, the offset minimizing resistor is used to minimize the effect of input bias currents on the output offset voltage. However, when the inputs are DC voltages, the offset compensating network must be used. 10. State the application in which summing, scaling or averaging amplifiers are used?