Question

The maximum magnitude of the output offset voltage is

(a) VOIio = RF*Iio

(b) VOIio = RF*( IB1+IB2)

(c) VOIio = RF*IB1

(d) VOIio = RF*( IB1-IB2)

This question was posed to me in quiz.

Origin of the question is Input Offset Current and Total Output Offset Voltage in division Operational Amplifier Fundamentals of Linear Integrated Circuits

Answer 1

The correct answer is:

(a) VOIio = RF * Iio

Explanation:

The maximum magnitude of the output offset voltage due to input offset current (Iio) is given by the formula:

$$VOIio=RF\times Iio$$

Where:

• $VOIio$ is the output offset voltage caused by the input offset current.
• $RF$ is the feedback resistor in the op-amp circuit.
• $Iio$ is the input offset current, which is the difference between the bias currents of the inverting and non-inverting terminals of the op-amp.

This formula describes how the offset current causes an additional voltage at the output, scaled by the feedback resistor.