Question
What is meant by the term “op-amp input offset voltage”?
Answer Options
- 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: C
Explanation
The input offset voltage is a measure of the imperfection of a real operational amplifier (\text{op-amp}). Ideally, if both input terminals of a differential \text{op-amp} are connected to the exact same voltage (e.g., ground), the output voltage should be exactly zero. However, due to slight mismatches in the input transistors, the output will usually sit at a small non-zero voltage.
The \mathbf{op-amp} input offset voltage is defined as the differential input voltage needed to bring the open loop output voltage to zero. This small, error voltage (usually in the microvolt or millivolt range) must be applied between the two inputs to compensate for the internal mismatch and force the output to the ideal zero voltage.
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