Answer – D. difference between two base currents..
The input offset current equals the difference between two base currents.
Input offset current: It is not necessary that IB+and IB- are the same. Their difference is known as input offset current and generally the order of 200nA for BJT and 10pA for FET and the output in the absence of input will be
Vout=RF.(IOS) order of mV
Where IOS= IB+-IB-
This effect of Input offset current can be minimized by using the value of RF.
Therefore, The input offset current equals the difference between two base currents.
Hence, Option (D) is the correct answer.
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