E7G04 - Amateur Extra Class

E7G04 : What is meant by the term op-amp input offset voltage?
A The output voltage of the op-amp minus its input voltage
B The difference between the output voltage of the op-amp and the input voltage required in the immediately following stage
C The differential input voltage needed to bring the open loop output voltage to zero
D The potential between the amplifier input terminals of the op-amp in an open loop condition
Correct Answer: The differential input voltage needed to bring the open loop output voltage to zero