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Linear Integrated Circuits Quiz

Total questions: 124

Worksheet time: 6hrs 12mins

Name
Class
Date
1.

Mention the importance of offset voltage of an operational amplifier.

4 lines
2.

Define CMRR.

4 lines
3.

Write down the requirements to be met for a good current source.

4 lines
4.

List the advantages of integrated circuits over discrete component circuit.

4 lines
5.

What is an operational amplifier?

4 lines
6.

How do you make a current mirror with magnification?

4 lines
7.

Define slew rate and what causes the slew rate?

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8.

State the classes of op-amp IC 741.

4 lines
9.

Why do we use Rcomp resistor?

4 lines
10.

Draw the op-amp symbol and state its important terminals.

4 lines
11.

Formulate the ideal value of Power supply rejection ratio (PSRR)?

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12.

An op-amp has a gain of twelve million. Express this gain in dB.

4 lines
13.

Why RE cannot be selected very high for practical cases?

4 lines
14.

One differential amplifier has CMRR of 100db and other has CMRR of 40db. Which you will prefer and why?

4 lines
15.

In what way 741S is better than 741?

4 lines
16.

An op-amp in open loop is not used for most of the applications. Justify

4 lines
17.

Brief the necessity of active loads preferred than passive loads in the input stage of an operational amplifier.

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18.

IC741 op-amp not used for high frequency applications- Justify.

4 lines
19.

Calculate the maximum distorted amplitude that a sine wave input of 10 kHz, can produce at the output of an op-amp whose slew-rate is 0.5v/μsec.

4 lines
20.

A Differential amplifier has a differential voltage gain of 2000 and common mode gain of 0.2. Determine CMRR.

4 lines
21.

Define and explain slew rate. Derive its equation. Also explain method adapted to improving slew rate.

4 lines
22.

(i) Write down the characteristics and their respective values of an ideal Operational amplifier. (ii)Use appropriate block diagram and explain the general stages of an Op-Amp IC.

4 lines
23.

What is a current mirror? Give the current mirror circuit analysis.

4 lines
24.

Draw the circuit of Widlar current source and derive an expression for its output current?

4 lines
25.

With the help of a neat circuit diagram, discuss the construction and working of Wilson current source?

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26.

With neat circuit diagrams, explain the operation of (i)Voltage reference circuit using temperature compensation (ii)Voltage reference circuit using avalanche diode reference

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27.

List and explain the DC characteristics of an operational amplifier

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28.

Compare the ideal and practical characteristics of IC741

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29.

Determine the output voltage of a differential amplifier for the input voltages of 300μV and 240μV. The differential gain of the amplifier is 5000 and the value of the CMRR is (i)100 (ii)10

4 lines
30.

An Op-amp has a differential gain of 80dB and CMRR of 95dB. If V1 = 2μV and V2 = 1.6μV, then calculate the (i) Differential mode output values. (ii) Common mode output values.

4 lines
31.

Construct the BJT differential amplifier with active load and explain its operating principle.

4 lines
32.

(i)In response to a square wave input, the output of an op amp changed from -3V to +3V over a time interval of 0.25μs. Determine the slew rate of the op amp. (ii)Assuming a slew rate for 741 IC is 0.5v/μS. What is the maximum undistorted sinewave that can be obtained for 12V peak?

4 lines
33.

Write note on LF155 JFET input operational amplifier and TL082 wide bandwidth dual JFET input operational amplifier with necessary diagram.

4 lines
34.

From the equivalent circuit of practical op-amp, obtain the expression for open loop voltage gain

4 lines
35.

Derive the transfer characteristics of dual input differential amplifier showing the linear and limiting regions. Comment on the same.

4 lines
36.

(i) A square wave peak-to-peak amplitude of 750mV has to be amplified to a peak-to-peak amplitude of 3.8V, with rise time of 4.5 μs or less. Can IC741 be used? (ii) For an operational amplifier having a slew rate of 3V/μSec. What is the maximum closed loop voltage gain that can be used when the input signal varies by 0.4V in 12μSec.

4 lines
37.

Construct a Widlar Current Source with a reference current if 1mA and RE as 5KΩ. Determine the approximate value of IC2 neglecting the base currents.

4 lines
38.

(i) For a typical op – amp, ICQ = 15μA and C = 35pF. The peak value of input is 12V. Determine slew rate and maximum possible frequency of input voltage that can be applied to get undistorted Output. (ii) An Op-amp has 7kHz sine wave input signal. Find the largest amplitude that the output of the amplifier can have without distortion with ICQ of 8μA and Cc of 27pF.

4 lines
39.

Mention two linear and two non-linear applications performed by an operational amplifier

4 lines
40.

Write the two realistic simplifying assumptions used for op-amp.

4 lines
41.

Define about sign changer.

4 lines
42.

How to obtain the average circuit from an inverting summer?

4 lines
43.

Compare the inverting and non-inverting operational amplifier configurations.

4 lines
44.

Give the applications of inverting & non- inverting amplifiers.

4 lines
45.

Identify the operating voltage range of IC 741?

4 lines
46.

Outline any four applications of Instrumentation amplifier.

4 lines
47.

Assess the need for converting a first order filter into a second order filter.

4 lines
48.

What is the function of a Phase shift circuit?

4 lines
49.

Point out the need for converting a first order filter into a second order filter.

4 lines
50.

Sketch the Op-amp integrator & differentiator circuit with necessary equation.

4 lines
51.

State the errors in an ideal integrator?

4 lines
52.

List any five characteristics of comparator.

4 lines
53.

Construct an adder circuit using op-amp to get the out

4 lines
54.

State the errors in an ideal integrator?

4 lines
55.

List any five characteristics of comparator.

4 lines
56.

Construct an adder circuit using op-amp to get the output expression as Vo = - (0.1 V1 +V2+5 V3)

4 lines
57.

An a.c signal has got a magnitude of 0.1V peak to peak. Suggest a suitable half wave rectifier for this signal.

4 lines
58.

Why active guard drive is necessary in an instrumentation amplifier?

4 lines
59.

Find the output voltage of the following circuit. Given R1 =R2 = 10kΩ and Rf = 100

4 lines
60.

Differentiate precision rectifier from the conventional rectifier.

4 lines
61.

Draw a inverting AC amplifier circuit.

4 lines
62.

With a suitable circuit diagram, explain the operating principle of an instrumentation amplifier and derive its gain. (13)

4 lines
63.

Construct the circuit diagram of Adder, Subtractor, and Averaging circuit using op-amp with circuit analysis. (13)

4 lines
64.

Write the operation of Current to Voltage and Voltage to current converter circuits. (13)

4 lines
65.

Describe the working of Full wave Precision Rectifier in detail. Draw the waveforms associate with it. (13)

4 lines
66.

Derive the expression for log computation using op-amp and explain necessary circuit diagram. (13)

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67.

(i)With neat figures describe the working of an integrator using op-amp. (ii) Derive the expression for output voltage of an practical integrator. (7) (6)

4 lines
68.

Explain the working of clipper and clamper circuits using Op amp? (13)

4 lines
69.

Design a second order low pass filter using operational amplifier for the upper cut off frequency of 2.5kHz. Assume the value of capacitor to be 0.1μF (13)

4 lines
70.

(i)Discuss the working of an differentiator using op-amp. (ii) List out the errors in ideal differentiator and analyse the practical differentiator for those error. (6) (7)

4 lines
71.

For the non-inverting op amp shown in figure, find the output voltage Vo (13)

4 lines
72.

For perfect lock, what should be the phase relation between the incoming signal and VCO output signal?

4 lines
73.

Mention the classification of phase detector. Write about switch type phase detector.

4 lines
74.

List the problems associated with switch type phase detector.

4 lines
75.

Why VCO is also called as V to F converter?

4 lines
76.

On what parameters does the free running frequency of VCO depend on?

4 lines
77.

Outline the need for frequency synthesizer.

4 lines
78.

Interpret the relation between capture ranges and lock range in a PLL.

4 lines
79.

Write the purpose of having a low pass filter in PLL.

4 lines
80.

Discuss the effect of having large capture range.

4 lines
81.

Assess the features of IC 566 VCO.

4 lines
82.

Which parameter decides the pull-in time?

4 lines
83.

Identify the merits of companding.

4 lines
84.

Give the applications of OTA.

4 lines
85.

Justify the need of pre-distortion circuits in Gilbert analog multiplier.

4 lines
86.

Analyze the necessity of modulation.

4 lines
87.

Construct the circuit of AM detector using PLL.

4 lines
88.

Distinguish the advantages & disadvantages of monolithic PLLs over discrete PLLs.

4 lines
89.

How would you describe the block diagram of PLL and derive the expression for Lock range and capture range. (13)

4 lines
90.

Illustrate the operation of VCO with neat block diagram. Also derive an expression for f0. (13)

4 lines
91.

(i) Analyze the Gilbert’s four quadrant multiplier cell with a neat circuit diagram. (ii) Identify how a frequency doubler can be realized using this cell. (8) (5)

4 lines
92.

Discuss any three applications of PLL in detail. (13)

4 lines
93.

Explain the purpose and functioning of (i)Frequency division circuit using PLL IC565 (ii) Frequency synthesizer. (7) (6)

4 lines
94.

(i) Estimate the working principle of operational Transconductance Amplifier(OTA). (ii) List the applications of VCO for FM generation. (8) (5)

4 lines
95.

(i) Define capture range and lock range. (ii) Elaborate the process of capturing the lock and also derive for capture range and lock range. (3) (10)

4 lines
96.

(i) How would you explain the working of a VCO? (ii) Derive the expression for voltage to frequency conversion factor. (6) (7)

4 lines
97.

Determine the change in DC control voltage Vc during lock, if input signal frequency fs = 20 KHz, the free running frequency is 21 KHz and the V/F transfer coefficient of VCO is 4 KHz. (13

4 lines
98.

(i) Examine the multiplier cell using emitter‐coupled transistor pair. (ii) Illustrate that the output voltage is proportional to the product of the two input voltages and state their limitations. (8) (5)

4 lines
99.

A PLL IC565 connected as an FM demodulator has R1 = 10K, C1 = 0.01 μF and c= 0.4 μF. The supply voltage is +12V. Determine the Free running Frequency, Lock range and capture range. (13)

4 lines
100.

Discuss the following applications of Analog Multiplier ICs (i) Voltage squarer and Voltage divider (ii) Square rooter and Phase angle detector (7) (6)

4 lines
101.

(i) Summarize the basic analog multiplication techniques. (ii) Develop the expression for free running frequency of voltage controlled oscillator. (7) (6)

4 lines
102.

Illustrate the closed loop analysis of PLL with necessary diagrams (13)

4 lines
103.

(i) For PLL 565, given the free-running frequency as 100KHz, the demodulation capacitor of 2μf and supply voltage is ±6V, determine the lock and capture frequencies and identify the component values. (ii) A PLL has a free running frequency of 300KHz and the bandwidth of the low pass filter is 50KHz. Check whether the loop acquires lock for an input signal of 320KHz. (8) (7)

4 lines
104.

Explain the operation of a variable trans conductance multiplier circuit. Derive the expression for its output voltage. (15)

4 lines
105.

Classify the A/D converters based on their operational features.

4 lines
106.

List the direct type ADCs.

4 lines
107.

Recall about the function of integrating type converter.

4 lines
108.

Describe the principle of operation of successive Approximation ADC.

4 lines
109.

Mention the main advantages of integrating type ADCs.

4 lines
110.

Define Sampling.

4 lines
111.

Compare the advantages and drawbacks of a dual‐slop ADC.

4 lines
112.

Distinguish between conversion time and settling time.

4 lines
113.

Find the number of resistors required for an 8-bit weighted resistor D/A converter. Consider the smallest resistance is R and obtain those resistance values.

4 lines
114.

Give the advantages of inverted R-2R (current type) ladder D/A converter over R -2R (voltage type) D/A converter?

4 lines
115.

Brief the need for electronic switches in D/A converter and mention the names of the switches used in MOS transistors.

4 lines
116.

What is meant by delta modulation?

4 lines
117.

How would you justify, which type of ADC is the fastest?

4 lines
118.

Outline the principle of operation of voltage to time conversion.

4 lines
119.

Calculate the values of LSB and MSB for an 8‐bit DAC for 0V to 10V range.

4 lines
120.

Point out the features of granular error and slope overload error.

4 lines
121.

An 8 bit A/D converter accepts an input voltage signal of range 0 to 12v. What is the digital output for an input voltage of 6V?

4 lines
122.

Obtain the number of comparators required for realizing a 4‐bit flash ADC.

4 lines
123.

Compare and contrast the binary weighted and R‐2R ladder DAC.

4 lines
124.

Write the need of sigma and delta converters.

4 lines

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