Integrated Circuit (IC) Data Sheets MCQ [Free PDF] – Objective Question Answer for Integrated Circuit (IC) Data Sheets Quiz

Linear Integrated Circuit MCQ / May 3, 2022

1. How many sets of electrical specifications are there for 741C op-amp?

A. Five
B. Eight
C. Two
D. Ten

Answer: C

There are two sets of electrical specifications. One set of specifications applies at room temperature of 25oC, whereas the other set applies to the commercial temperature range from 0 to 70oC.

 

2. Calculate the input offset current from the circuit shown below:

A. +1.55mA
B. ±1.55mA
C. -1.55mA
D. None of the mentioned

Answer: A

The algebraic difference between the current into the inverting and non-inverting terminal is referred to as input offset current.

Iio = |IB1-IB2| =|3.2 – 4.75|=|-1.55|

=> Iio = +1.55mA.

 

3. What is the value of current drawn from power supply 741c op-amp?

A. Is = 1.5mA
B. Is = 3.2mA
C. Is = 4.0mA
D. Is = 2.8mA

Answer: A

Supply current is the current drawn by the op-amp from the power supply; this parameter is not given on most op-amp data. For 741c op-amp, the supply current Is=2.8mA response.

 

4. Which is a time-varying response?

A. Steady-state response
B. Transient response
C. Both Steady-state and transient response
D. None of the mentioned

Answer: B

The rise time and percentage of overshoot are the characteristics of transient response.

 

5. How are the equivalent input noise voltage and current?

A. Noise voltage = V2/Hz and Noise current = A2/Hz
B. Noise voltage = V3/Hz and Noise current = A2/Hz
C. Noise voltage = V2/Hz and Noise current = A3/Hz
D. Noise voltage = V3/Hz and Noise current = A3/Hz

Answer: A

As the electrical noise is random in nature, it is expressed as a root mean square value. The equivalent input noise voltage is expressed as square voltage (V2/Hz) and the equivalent input noise current as square noise current (A2/Hz).

 

6. The physical closeness of dual and quad package op-amp results in

A. Op-amp coupling
B. Amplifier to amplifier coupling
C. Channel coupling
D. Signal to noise coupling

Answer: B

When a signal is applied to the input of only one op-amp, some signal will appear at the output of another op-amp due to the physical closeness of op-amps in dual and quad packages, this causes the amplifier to amplifier coupling.

 

7. A parameter that is applicable only to dual and quad op-amp is

A. Channel separation
B. Gain bandwidth product
C. Long term input offset voltage stability
D. Equivalent input noise voltage and current

Answer: A

Channel separation is specified in the dual and quad op-amp datasheet because it is a measure of the amount of electrical coupling between op-amps that are integrated on the same chip.

 

8. Select the parameter that is not included in the evaluation for ac applications.

A. Gain-bandwidth product
B. Channel separation
C. Slew rate
D. All of the mentioned

Answer: C

Slew rate is one of the important factors in selecting the op-amp for ac application, particularly at relatively high frequencies application in oscillators, comparators, and filters.

 

9. Which information is not included in a typical datasheet of an op-amp?

A. Brief description of the basic type of the device
B. Pin configuration, package type & order information
C. Internal schematic diagram
D. Characteristics analysis of amplifier applications

Answer: D

The characteristics of the amplifier are included in the datasheet whereas, the application’s characteristics will not be included. Rather a collection of amplifier applications with circuit diagrams can be found in the datasheets.

 

10. How are input offset voltage of op-amp expressed

A. Microvolts per week
B. Nanovolts per week
C. Megavolts per week
D. Millivolts per week

Answer: A

For long-term stability, the amount of change in input offset voltage with time is crucial and denoted as microvolts per week.

 

11. Find the expression for output offset voltage?

A. VooT = [RF/R1×Vio] + (RF×Io)
B. VooT = [1+(RF/R1)]×(Vio) + (RF×Io)
C. VooT = [1+(RF/R1)]/(Vio) + (RF×Io)
D. VooT = [RF/R1]×(Vio) + (RF/Io)

Answer: B

The output offset voltage is expressed as a function of input offset current and input offset voltage when is given as

VooT = [1+(RF/R1)]×(Vio) + (RF×Io).

 

12. Why it is necessary to calibrate all op-amps in the system periodically?

A. To maintain the current drift of a system
B. To maintain output offset voltage in op-amp
C. To maintain accuracy and linearity of a system
D. None of the mentioned

Answer: C

In practice, the output offset voltage in all op-amp circuits will change with time. Therefore, to maintain the desired accuracy and linearity of a system, it is necessary to calibrate all op-amps in that system periodically.

 

13. Determine the maximum possible change in output offset voltage after 3 months if the LH0041C op-amp is initially nulled and at room temperature, the voltage across the terminal, +Vcc & -Vee remains constant.

A. △VooT = 456.78mv
B. △VooT = 3.452mv
C. △VooT = 21.1mv
D. None of the mentioned

Answer: D

For LH0041C,

△Vio/△t = 5µV/week and △Iio /△t = 2nA/week.

Due to the time drift △t=12 weeks (3months). The maximum possible change in output offset voltage,

△VooT = [[1+(RF/R1)]×(△Vio/△t)×△t]+[RF×(△Iio/△t) ×△t]= [(1+(250kΩ/1kΩ))×5µV×12] + [250kΩ×2µA×12]

= 15.1mv+6mv

=> △VooT = 21.1mv.

 

14. How to minimize the drift in the input signal amplifier without affecting the performance of the circuit?

A. All of the mentioned Choosing the small value of external components
B. Enhancing the input signal amplifier
C. Reducing the gain of the op-amp
D. All of the mentioned

Answer: A

The amount of drift in the input signal depends on the relative values of external components. So, if relatively small values are selected for an external component then drift can be minimized.

 

15. An amplifier has a supply voltage of ±15v. Compute its peak to peak output swing

A. 36v
B. 30v
C. 26v
D. 49v

Answer: C

The peak to peak output swing depends on the value of the supply voltage ( which is +15v-(-15v) =30v ) and is always less than the value to maintain the safe operation of the op-amp.

 

16. Find out the incorrect statement regarding IC Data Sheets.

A. Power consumption of op-amp decrease with increasing ambient temperature
B. Output short circuit current of op-amp decreases with increasing temperature.
C. Common mode voltage range of op-amp increases with an increasing supply voltage value
D. Power consumption of op-amp decreases with increasing supply voltage

Answer: D

If the power consumption as a function of the supply voltage curve is drawn, it can be seen that the amount of dc power required to operate the op-amp under no-load conditions increases with an increase in supply voltage.

 

17. Choose the temperature-dependent parameter

A. Common mode rejection ratio
B. Voltage gain
C. Output voltage swing
D. Absolute maximum power dissipation

Answer: D

Other than absolute maximum power dissipation the remaining are frequency-dependent parameters.

 

18. Determine the output from the following circuit

A. 180o in phase with an input signal
B. 180o out of phase with an input signal
C. Same as that of an input signal
D. Output signal cannot be determined

Answer: B

The input signal is given to the inverting input terminal. Therefore, the output Vo is 180o out of phase with input signal V2.

 

19. Which of the following electrical characteristics is not exhibited by an ideal op-amp?

A. Infinite voltage gain
B. Infinite bandwidth
C. Infinite output resistance
D. Infinite slew rate

Answer: C

An ideal op-amp exhibits zero output resistance so that output can drive an infinite number of other devices.

 

20. An ideal op-amp requires infinite bandwidth because

A. Signals can be amplified without attenuation
B. Output common-mode noise voltage is zero
C. Output voltage occurs simultaneously with input voltage changes
D. Output can drive the infinite number of device

Answer: A

An ideal op-amp has infinite bandwidth. Therefore, any frequency signal from 0 to ∞ Hz can be amplified without attenuation.

 

21. Ideal op-amp has infinite voltage gain because

A. To control the output voltage
B. To obtain a finite output voltage
C. To receive zero noise output voltage
D. None of the mentioned

Answer: B

As the voltage gain is infinite, the voltage between the inverting and non-inverting terminal (i.e. differential input voltage) is essentially zero for finite output voltage.

 

22. Find the output voltage of an ideal op-amp. If V1 and V2 are the two input voltages

A. VO= V1-V2
B. VO= A×(V1-V2)
C. VO= A×(V1+V2)
D. VO= V1×V2

Answer: B

The output voltage of an ideal op-amp is the product of gain and the algebraic difference between the two input voltages.

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