Explanation: When amplifier is nulled at room temperature, the effect of input offset voltage and current is reduced to zero. Change in the total output offset voltage occurs only, if there is any change in the value of Vio and Iio. Therefore, the total output offset voltage will be zero at room temperature. 4. How the effect of voltage and current drift on the performance of an amplifier is determined?
A. △VooT/△T = {[1-RF/R1)]×(△Vio/△T)} + RF×(△Iio/△t)
B. △VooT/△T = {(-RF/R1)×(△Vio/△T)} + RF×(△Iio/△t)
C. △VooT/△T = {[1+(RF/R1)]×(△Vio/△T)} + RF×(△Iio/△t)
D. None of the mentioned
Answer:A
Explanation: When amplifier is nulled at room temperature, the effect of input offset voltage and current is reduced to zero. Change in the total output offset voltage occurs only, if there is any change in the value of Vio and Iio. Therefore, the total output offset voltage will be zero at room temperature. 4. How the effect of voltage and current drift on the performance of an amplifier is determined?
A. △VooT/△T = {[1-RF/R1)]×(△Vio/△T)} + RF×(△Iio/△t) B. △VooT/△T = {(-RF/R1)×(△Vio/△T)} + RF×(△Iio/△t) C. △VooT/△T = {[1+(RF/R1)]×(△Vio/△T)} + RF×(△Iio/△t) D. None of the mentioned
Explanation: As the amplifier is used in inverting configuration, the effect of voltage and current drift is given as, the average change in total output offset voltage per unit change in temperature.