Question Bank for LIC_2019-20(new) 17EC45

Subject Name Linear Integrated Circuits

Subject code : 17EC45

Semester : IV

Module 1:

Operational Amplifier Fundamentals: Basic Op-amp circuit, Op-Amp parameters – Input and output voltage, CMRR and PSRR, offset voltages and currents, Input and output impedances, Slew rate and Frequency limitations. OP-Amps as DC Amplifiers – Biasing OP-amps, Direct coupled voltage followers, Non-inverting amplifiers, inverting amplifiers, Summing amplifiers, and Difference amplifiers. Interpretation of OP-amp LM741 & TL081 datasheet. (Text1)

Module 2:

Op-Amps as AC Amplifiers: Capacitor coupled voltage follower, High input impedance – Capacitor coupled voltage follower, Capacitor coupled non inverting amplifiers, High input impedance – Capacitor coupled Non inverting amplifiers, Capacitor coupled inverting amplifiers, setting the upper cut-off frequency, Capacitor coupled difference amplifier. OP-Amp Applications: Voltage sources, current sources and current sinks, current amplifiers, instrumentation amplifier, precision rectifiers. (Text1)

Module 3:

More Applications : Limiting circuits, Clamping circuits, Peak detectors, Sample and hold circuits, V to I and I to V converters, Differentiating Circuit, Integrator Circuit, Phase shift oscillator, Wein bridge oscillator, Crossing detectors, inverting Schmitt trigger. (Text 1) Log and antilog amplifiers, Multiplier and divider. (Text2)

Module 4:

Active Filters: First order and second order active Low-pass and high pass filters, Bandpass Filter, Bandstop Filter. (Text 1) Voltage Regulators: Introduction, Series Op-amp regulator, IC voltage regulators. 723 general purpose regulators. (Text 2)

Module 5:

Phase locked loop: Basic Principles, Phase detector/comparator, VCO. DAC and ADC convertor: DAC using R-2R, ADC using Successive approximation. Other IC Application: 555 timer, Basic timer circuit, 555 timer used as astable and monostable multivibrator.(Text 2)

Module 1

Operational Amplifier Fundamentals: Basic Op-amp circuit, Op-Amp parameters – Input and output voltage, CMRR and PSRR, offset voltages and currents, Input and output impedances, Slew rate and Frequency limitations. OP-Amps as DC Amplifiers – Biasing OP-amps, Direct coupled voltage followers, Non-inverting amplifiers, inverting amplifiers, Summing amplifiers, and Difference amplifiers. Interpretation of OP-amp LM741 & TL081 datasheet. (Text1)

1)	Define the following terms with respect to opamp and specify their typical values for a 741 opamp i)PSRR ii)CMRR iii) Slew rate iv) Input voltage range and output voltage range July 2018/Jan 2018	08 Marks
2)	Sketch an opamp difference amplifier circuit. Derive an eqution for output voltage and explain the operation. July 2018	05 Marks
3)	A non inverting amplifier is to amplify a 100 mV signal to a level 0f 3 V. Using 741 opamp design a suitable circuit. July 2018	5 Marks
4)	With a neat diagram, explain the operation of a direct coupled inverting amplifier with necessary design steps.	4 Marks
5)	Compare emitter follower with voltage follower Jan 2018	04 Marks
6)	A voltage follower using 741 opamp is connected to signal source with resistance of R_s= 47KΩ. Calculate suitable value of resistance R1 and also maximum voltage drop across each resistor and maximum input offset voltage produced by input offset current . Jan 2018	06 Marks
7)	Derive equation of 3 input non inverting summing circuit and show how it can be converted into averaging circuit July 2018/ Jan 2018	08 Marks
8)	Explain the operation of a basic op-amp circuit. July 2018/ Jan 2018	06 Marks
9)	An operational amplifier circuit with closed loop gain is 100 and common mode output voltage is 5mV and common mode input is 5mV, determine common mode rejection ratio. Jan 2018	02 Marks
10)	Define the following terms with respect to opamp and specify their typical values for a 741 opamp: i) CMRR ii) PSRR iii) Slew Rate Jan 2017 2016/Jan 2015	06 Marks
11)	Derive an expression for the output voltage of non-inverting summing circuit Jan 2017	07 Marks
12)	The difference of two input signals is to be amplified by a factor of 37. Each input has an amplitude of approximately50 mv. Using LF353 opamp, design a difference amplifier to obtain approximately equal input resistance at the equal input resistance at two input terminals and also provide common mode nulling. Jan 2017	07 Marks
13)	Using a BiFET Opamp , Design a capacitor coupled inverting amplifier with an input signal of 30mv , a load resistance of 2.2 KΩ, A_v= 150 and f₁= 80 Hz. Jan 2017	5 Marks
14)	A high input impedance capacitor coupled non-inverting amplifier is to be designed using 741 opamp with A_v= 120 and f₁= 100 Hz input signal of 50mv and load the load resistance ranging from 2.7 KΩ to 27 KΩ. Jan 2017	6 Marks
15)	What is CMRR in an operational amplifier? A 741 opamp is used in a non inverting amplifier with a voltage gain of 50. Calculate the typical voltage that would result from a common mode input with a peak level of 100 mv. July 2016	6 Marks
16)	Design a non inverting direct coupled amplifier using a bipolar opamp. Write the circuit diagram. July 2016	7 Marks
17)	Design an inverting amplifier using a 741 opamp. The voltage gain is to be 50 and the output voltage amplitude is to be 2.5V. July 2016	7 Marks
18)	Explain about the high input impedance capacitor coupled voltage amplifier circuit, with relevant equations. July 2016	7 Marks
19)	Explain about capacitor coupled voltage follower using a single polarity supply, with circuit diagram. July 2016	7 Marks
20)	With a neat circuit diagram explain the basic opamp circuit. Jan 2016	6 Marks
21)	Obtain the expression for output voltage for the two input inverting summing amplifier circuit.	4 Marks
22)	Draw a neat circuit diagram of a capacitor coupled voltage follower and explain its operation with necessary design steps. Jan 2016/Jan 2015	8 Marks
23)	Design a high impedance capacitor coupled non inverting amplifier to have a low cut off frequency of 200 Hz. The input and output voltages are to be 16 mV and 4 V respectively and minimum load resistance of 10KΩ. Select R2= 1 MΩ and C1= 0.1µF. Jan 2016	6 Marks
24)	Explain the working of a basic opamp circuit with Rc= 7.5 KΩ, R_E = 3.8 KΩ and powered by ±12v supply July 2015	8 Marks
25)	Design a bias current compensated inverting amplifier to amplify a dc input of 150 mv by a factor of 40. Use a bipolar opamp with I_Bmax= 500 nA. July 2015	6 Marks
26)	Sketch an opamp direct coupled difference amplifier circuit. Explain the operation of circuit and derive an equation for the output voltage. Jan 2015	7 Marks
27)	Design a direct coupled non inverting amplifier to amplify 100 mV signal signal using IC741 to a level of 4 V. Jan 2015	5 Marks
28)	Explain how the upper cut off frequency can be set for inverting amplifiers. Jan 2015	7 Marks
29)	Define the following terms with respect to opamp and specify their typical values for a 741 opamp: i) CMRR ii) PSRR iii) Slew R ate iv) Output offset voltage July 2014	8 marks
30)	A non-inverting amplifier is to amplify a 100 mV signal to a level to 5V Using a 741 opamp, design a suitable circuit.	6 Marks
31)	Sketch the circuit of a high Z_incapacitor coupled voltage follower and design its steps. July2014	6 Marks
32)	A capacitor coupled non inverting amplifier using 741 opamp has A_v=100 & Vo=5V. The load resistance is 10KΩ and the lower cuo-off frequency is to be 100 Hz. Design a suitable circuit. July 2014	8 marks
33)	A capacitor coupled non inverting opamp is to have Af= 100 and Vo=5 V with Rl=10 KΩ and f1=100Hz. Design a sultable circuit. July 2013	6 Marks
34)	Define gain margin and phase margin and explain explain how they help for stability check. July 2013	4 Marks

Module 2

1)	Explain capacitor coupled voltage follower circuit. July 2018/ Jan 2018	08 Marks
2)	What are the advantages of precision rectifier over ordinary rectifier? Discuss the operation of precision full wave rectifier circuit using bipolar opamp. July 2018	08 Marks
3)	Draw the circuit diagram of instrumentation amplifier and explain its operation . Also show how voltage gain can be varied. July 2018	08 Marks
4)	A capacitor coupled non-inverting amplifier is to have A_v= 100 and Vo= 5V with R_L= 10 KΩ and f1=100 Hz. Design a suitable circuit using 741 opamp	8 Marks
5)	Design a precision voltage source to provide an output of 9 V the ability supply is ±12V allow approximately ±10% tolerance on Zener diode voltage Jan 2018	08 Marks
6)	Design an instrumentation amplifier to have an overall gain of 900. The input signal amplitude of 15mV, 741 opamp is to be used. Supply is ±15V Jan 2018	08 Marks
7)	Explain high Z_incapacitor coupled non inverting amplifier with design steps. Jan 2018
8)	Discuss about the conditions that have to be fulfilled for an opamp circuit to oscillate Jan 2017	5 Marks
9)	With the help of circuit schematic and frequency response explain how phase compensation can be used to stabilize opamp circuit. Jan 2017	5 Marks
10)	Mention the need for Z_in MOD compensation . Discuss the role of compensating Compose in Z_in MOD compensation for an inverting amplifier. Jan 2017	5 Marks
11)	List the precautions to be observed for opamp circuit stability. Jan 2017	8 Marks
12)	Design a low resistance voltage source (with refence voltage derived from potential divider) to provide an output voltage of 8V. A 741 opamp with a ±15 V supply is to be used and the maximum output current is to be 60 mA. Jan 2017	8 Marks
13)	Determine the range of resistance of externally connected resistor R_G for a LH0036 instrumentation amplifier to give a voltage gain adjustable from 30 to 300. Jan 2017	3 Marks
14)	Design a precision full wave rectifier consisting of a summing circuit and a precision half wave rectifier to produce a 2V peak output from a sine wave input with peak value of 0.5V and frequency of 1MHz Jan 2017	7 Marks
15)	Explain the current amplifier circuit using a opamp. July 2016	6 Marks
16)	Explain the instrumentation amplifier with differential input/output which accepts a differential input voltage and amplifies it to produce a differential output using op amps. July 2016/July 2013	8 Marks
17)	Design a non saturating precision half wave rectifier which produce a 2V peak output from a sine wave input with a pesk value of 0.5 v and frequency of 1 MHz. Use a bipolar opamp with a supply voltage of ±15KHz. July 2016	6 Marks
18)	What are the advantages of precision rectifier over ordinary rectifier? Explain the working of a full wave Precision rectifier. July 2016	8 Marks
19)	What are the advantages of precision rectifier over ordinary rectifier? Explain the working of a full wave precision rectifier. July 2015	8 Marks
20)	Explain frequency compensation based on miller effect also explaining the capacitance amplification principle. July 2015	6 Marks
21)	Design a current source to produce an output of 150 mA to a grounded laod of maximum value 30 Ω. Use an opamp with ±12V supply and a power MOSFET with R_Don=6Ω as the current booster. July 2015	8 Marks
22)	Explain Miller effect compensation Jan 2015	8 Marks
23)	Using an LM108 opamp, design an inverting amplifier to amplify a 100mV signal by a factor 3. Select sultable frequency compensation Jan 2015	6 Marks
24)	Design a precision voltage source to get an output of 8.5 V using 741 opamp. The supply voltage is ±15V and Zener diode has a tolerance of ±5% Jan 2015	6 Marks
25)	Explain frequency doubler technique using opamp. Jan 2014	6 Marks
26)	Draw the circuit and explain the working of an opamp limiter to have voltage Vz+Vd for negative cycle of input and –Vsat for positive cycle of input. July 2013	8 Marks
27)	What are the advantages of precision rectifier over ordinary rectifier? Explain the operation of precision half wave rectifier. July 2013	10 Marks

Module 3

1)	Explain precision clipping circuit Jan 2018	8 Marks
2)	Draw and explain the operation of sample and hold circuit with signal, control and output waveforms. July 2018	8 Marks
3)	With neat circuit diagram explain the working of precision clipping circuit, with necessary waveforms. July 2018	8 Marks
4)	With neat circuit diagram explain the operation of inverting Schmitt trigger circuit, Draw the output waveforms and discuss the design procedure. July 2018	8 Marks
5)	Explain log amplifier and derive its output voltage equation Jan 2018	8 Marks
6)	Using 741 opamp with supply voltage of ±12V design Schmitt trigger to have trigger points ±2V.	6 Marks
7)	Explain sample and hold circuit using opamp.	10 Marks
8)	A ±5V , 10 KHz square wave from a signal source with a resistance of 100Ω is to have positive peak clamped precisely at ground level. Tolt on the output is not to exeed 1% of the peak amplitude of the wave, Design the precision clamping circuit using a supply of ±12V Jan 2017	8 Marks
9)	Draw the fundamental circuit of logarithmic amplifier and derive an expression for output voltage. Jan 2017	6 Marks
10)	Design a Wein bridge oscillator to have an output frequency of 15 KHz using a BIFET opamp with a supply voltage of ±12V.	6 Marks
11)	With a neat circuit diagram and associated waveforms explain the working principal of Schmitt Trigger circuit. Jan 2017	6 Marks
12)	Explain the multiplier circuit with schematic symbol.	6 Marks
13)	Explain the operation of phase shift oscillator circuit with relevant waveforms. July 2016/Jan 2016	8 Marks
14)	With relevant diagrams, Explain the operation of negative clamper circuit using opamp. July 2016	6 Marks
15)	Design a triangular waveform generator to produce a ±2V, 1 KHz output. Use a ±15 V supply. Also calculate the minimum opamp slew rate. July 2016	8 Marks
16)	Design an RC-Phase shift oscillator to generate sustained oscillations at a frequency of 1.5KHz. Use a 741 opamp and ±12 V power supply	12 Marks
17)	Derive an expression , Discuss the fundamental log-amplifier circuit. July 2015	6 Marks
18)	Explain the operation of inverting Schmitt trigger circuit with the help of waveforms and transfer characteristics. July 2015/Jan 2015	8 Marks
19)	With neat circuit diagram and waveforms explain the working of triangular/rectangular waveform generator with frequency and duty cycle control. Jan 2015	10 Marks
20)	With neat circuit diagrams and waveforms explain the operation of astable multivibrator. Jan 2015	6 Marks
21)	Explain the operation of opamp sample and hold circuit with signal, control and output waveforms. Jan 2014	8 Marks
22)	Sketch the circuit of opamp astable multivibrator and show the voltage waveforms at various points and explain its operation Jan 2014	7 Marks

Module 4

1.	Explain a second order low pass filter and also write design equations. Jan 2018	8 Marks
2.	Draw the internal schematic for 723 IC voltage regulator and explain its working and also mention the advantages of IC voltage regulators. July 2018	8 Marks
3.	Design a second order active low pass filter using 741 opamp with cutoff frequency of 2KHz. Jan 2018	8 Marks
4.	Show how a band pass filter can be construted by the use of a LPF and a HPF. Sketch the expected frequency response and explain the operation of a single stage BPF. July 2018	8 Marks
5.	Explain the functional diagram of 723 general purpose regulator IC. Jan 2018	8 Marks
6.	Design a second order active high pass filter using 741 opamp with cutoff frequency of 1KHz. Jan 2018	6 Marks
7.	What is meant by line regulation and load regulator with respect to IC regulators and mention the characteristics of 3 terminal IC voltage regulators. Jan 2018	6 Marks
8.	Design a first order active low pass filter to have cutoff frequency of 1KHz. Use 741 opamp. Jan 2018	4 Marks
9.	Using a 741 opamp, design a second order low pass filter with a cut-off frequency of 1 KHz. Jan 2017/Jan 2015	6 Marks
10.	Discuss about the important characteristics of three terminal IC regulator Jan 2017	4 Marks
11.	Draw the functional diagram of IC723 voltage regulator and explain.	6 marks
12.	With the help of circuit schematic explain the principal of operation of switched mode power supply. Mention its advantages. Jan 2017	10 Marks
13.	Design a first order high pass active filter circuit to have a cut off frequency of 5 KHz . Use an LM108 opamp and estimate the highest frequency can be passed. July 2016.	6 Marks
14.	Explain the following terms. I) Line regulation II) Load regulation III) Ripple rejection briefly. July 2016	6 Marks
15.	Briefly explain the standard representation of 78XX series 3- terminal IC regulators and enumerate the characteristics of this type of regulators. Jan 2016	8 Marks
16.	With the help of neat diagram , explain the operation of adjustable regulator using fixed 3-terminal regulator. Jan 2016	6 Marks
17.	Explain the operation of basic high voltage regulator using IC 723. Jan 2016	6 Marks
18.	Design a first order high pass active filter for a cut-off frequency of 2 KHz. July 2015	4 Marks
19.	Briefly explain the operation of a series voltage regulator. July 2015	6 Marks
20.	Design a voltage regulator using LM 723 to obtain Vo= 5V and Io= 2A July 2015	4 Marks
21.	Explain the basic principal of operation of switching regulators. Also lost any four merits. July 2015	8 Marks
22.	Using a 741 opamp, design a second order active high pass filter for a cut off frequency of 4.5KHz. Jan 2015	6 Marks
23.	Explain the operation of switching regulator Mention its advantages. Jan 2015	7 Marks
24.	Design a voltage regulator using IC723 to get output voltage of 5V Jan 2015	7 Marks
25.	With a neat sketch explain the working of a R-2R ladder network July 2014/July 2013	8 Marks
26.	With block diagram explain successive approximation ADC July 2014/July 2013	6 Marks

Module 5

1.	Explain the 555 Timer circuit used as astable multivibrator with relevant waveforms. Jan 2018	8 Marks
2.	With the help of neat block diagram explain the operation of PLL and define (i) Lock-in range (ii) Capture range (iii) Pull-in time July 2018	8 Marks
3.	Explain the operation of VCO Jan 2018	8 Marks
4.	Explain analog to digital conversion using successive approximation method July 2018/ Jan 2018	8 Marks
5.	Explain the working of R-2R network D-A converter and derive expression for output voltage. July 2018	8 Marks
6.	Draw the internal schematic of 555 timer IC and configure it for monostable operation and explain its working with necessary euations. July 2018	8 Marks
7.	Explain the working principal of astable multivibrator with a neat circuit schematic and waveforms. Specify the design procedure for this circuit. Jan 2017/July 2016	9 Marks
8.	Draw the circuit diagram of monostable multivibrator using IC 555 and derive the expression for output pulse width. Jan 2017/Jan 2016	5 Marks
9.	Give the basic schematic of PLL and explain the function of each block. Jan 2017	06 Marks
10.	Draw the functional diagram of dual slope ADC and explain its working principal . Mention its advantages and limitations. Jan 2017	9 Marks
11.	Explain the 555 Timer circuit used as astable multivibrator with relevant waveforms. July 2016	8 Marks
12.	Explain the operating principles of Phase locked loop with relevant waveforms. July 2016	8 Marks
13.	Write short notes on Voltage controlled oscillator. July 2016	5 Marks
14.	Explain the operation of PLL with the help of neat block schematic diagram. Jan2018/ Jan 2016/Jan 2015	8 Marks
15.	What output voltage would be produced by DAC whose output range is 0 to 10 V and whose input binary number is i)1 0 (2- bit DAC) ii) 0 1 1 0 (4- bit DAC) iii) 1 0 1 1 1 1 0 0 (for 8- bit DAC) July 2015	6 Marks
16.	Design an Astable multivibrator using 555 timer to obtain a square wave of frequency 5KHz at 50% duty cycle. July 2015	6 Marks
17.	Discuss the operating principle of PLLs and define the lock-in and capture ranges. July 2015	8 Marks
18.	Explain the binary weighted technique of digital to analog conversion. What is its major disadvantage? July 2015	6 Marks
19.	Explain 555 timer as monostable multivibrator with relevant circuit diagrams, waveforms and expressions. Jan 2015	8 Marks
20.	With a neat diagram explain the working of weighted resistor DAC Jan 2015	6 Marks
21.	Draw the block diagram of PLL and explain its operation Jan 2015	6 Marks

Question Bank for LIC_2019-20(new) 17EC45

Question Bank for LIC_2019-20(new) 17EC45

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