Question

Thermal voltage drift is defined as

(a) △Vio/△T

(b) △VF/△T

(c) △Iio/△T

(d) △IB/△T

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I'd like to ask this question from Thermal Drift in section Operational Amplifier Fundamentals of Linear Integrated Circuits

Answer 1

The correct answer is:

(a) △Vio/△T

Explanation:

Thermal voltage drift refers to the change in the input offset voltage (Vio) of an operational amplifier as the temperature changes. It is typically expressed as the rate of change of the input offset voltage with respect to temperature.

The formula for thermal voltage drift is:

Thermal Drift=ΔVioΔT\text{Thermal Drift} = \frac{\Delta V_{io}}{\Delta T}Thermal Drift=ΔTΔVio​​

Where:

• ΔVio\Delta V_{io}ΔVio​ is the change in the input offset voltage.
• $\Delta T$ is the change in temperature.

This gives the rate at which the input offset voltage changes per unit temperature (typically in mV/°C).