# Thermal Drift MCQ’s

This set of Linear Integrated Circuits Multiple Choice Questions & Answers (MCQs) focuses on “Thermal Drift”.

1. Thermal voltage drift is defined as
a) △Vio/△T
b) △VF/△T
c) △Iio/△T
d) △IB/△T

2. A completely compensated inverting amplifier is nulled at room temperature 25oC, determine the temperature at which the total output offset voltage will be zero?
a) 50oC
b) 25oC
c) 75oC
d) 125oC

3. Which factor affect the input offset voltage, bias current and input offset current in an op-amp
a) Change in temperature
b) Change in supply voltage
c) Change in time
d) All of the mentioned

4. How the effect of voltage and current drift on the performance of an amplifier is determined?
a) △VooT/△T = {[1-RF/R1)]×(△Vio/△T)} + RF×(△Iio/△t)
b) △VooT/△T = {(-RF/R1)×(△Vio/△T)} + RF×(△Iio/△t)
c) △VooT/△T = {[1+(RF/R1)]×(△Vio/△T)} + RF×(△Iio/△t)
d) None of the mentioned

5. A 7.5kΩ internal resistor and a 12kΩ feedback resistor are connected to an inverting amplifier. Find the error voltage, if the output voltage is 3.99mv for an input of 1.33mv.
a) ±0.6v
b) ±0.6mv
c) ± 60mv
d) ±6mv

6.

The error voltage for the above circuit is 0.93v. Compute the output voltage?
a) +15v to +17v
b) +17v or -15v
c) -17v or +15v
d) None of the mentioned

7. The error voltage in a compensating inverting amplifier is obtained by
a) Multiplying △T to total output offset voltage
b) Multiplying △T to input offset voltage
c) Multiplying △T to input offset current
d) All of the mentioned

8. Consider the amplifier is nulled at 27oC. Calculate the output voltage , if the input voltage is 6.21mv dc at 50oC. Assume LM307 op-amp with specification: △Vio/△T=30µV/oC ; △Iio/△T = 300pA/oC; VS =±15v.

a) +0.53v or -0.68v
b) +0.52v or -0.78v
c) +0.54v or -0.90v
d) +0.51v or -0.86v 5 Star
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