DRONACHARYA COLLEGE OF ENGINEERING
Sessional Examination -I
ANALOG ELECTRONICS CIRCUIT
V Semester (ECE)
Time Allowed: 2 Hrs.
Max. Marks: 40
Note: - Attempt any four Questions. All carry equal marks
1. (a) What is an op-Amp ? Define the characteristics of an ideal
op-Amp.
(5)
(b) What is input offset voltage and input Bias current ?
(5)
2. (a) What is negative feedback ? Why it used ?
(b) Find the output equation of inverting op-Amp.
(5)
(5)
3. (a) What is voltage follower.
(b) What is Error voltage
(5)
(5)
4. Draw the schematic diagram of an op-Amp connected as :
(i) Adder Amplifier
(ii) Scaling Amplifier
(iii) Averaging Amplifier
(10)
5. Draw the circuit diagram of an inverting integrated and determine
its output equation.
(10)
6. Draw the ckt. of an inverting differentiator and determine its
output equation.
(10)
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September-2007
DRONACHARYA COLLEGE OF ENGINEERING
Sessional Examination -II
ANALOG ELECTRONICS CIRCUIT
V-Semester (ECE-I & II)
Time Allowed: 3 Hrs.
Max. Marks: 40
Note: - Attempt any five Questions. All questions carry equal marks
1. (a)
What is feedback in amplifiers ? Explain the major advantages of
using negative feedback in amplifiers.
(b) A negative feedback of β = 0.01 is applied to an amplifier of gain
1000. Calculate the change in overall gain of the feedback
amplifier if the internal amplifier is subjected to gain reduction of
15%.
2. Mention the advantages and disadvantages of negative feedback
amplifiers. Determine the gain bandwidth product of a negative F/B
amplifier.
3. (a) State and explain the Barkhansein Criterion for sustained oscillation.
(b) Draw and explain the R.C. phase shift oscillator and find an
expression for oscillator frequency.
4. (a) Draw and explain the emitter coupled differential amplifier and
derive an expression for its Input impendence Ri.
(b) Explain the parameters :
(i)
Input offset voltage
(ii)
Input offset current
(iii)
Power supply Rejection
(iv)
CMRR
(v)
Show rate
5. (a) Derive the expression of different mode gain. Describe the
advantages of a differential amplifier.
(b) What are the transfer characteristics of a differential amplifier.
6. (a) Draw and explain the working of an logarithmic amplifier and
derive the expression for output voltage.
(b) Draw and explain the working of an Integrator with neat circuit
diagram and waveforms.
7. (a) Explain how we can use an Op-amp as adder and substractor with
neat circuit diagram and wave forms.
(b) Draw and explain the working of an bridge amplifier with neat
circuit diagram.
8. (a) Draw and explain the working of an antilogarithmic amplifier and
derive the expression for output voltage.
(b) Draw and explain the working of an op-amp as a voltage to current
converter.
9. (a) Draw and explain the Square wave generator with neat circuit
diagram and waveforms.
(b) Draw and explain the triangular wave generator with neat circuit
diagram and waveforms.
10. (a) Write technical notes on :
(i)
Op-amp as ADC
(ii) Op-amp as R-2R DAC
(b) Explain the working of an op-amp as scale changer and obtain an
expression for its I/O voltage.
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September-2007
DRONACHARYA COLLEGE OF ENGINEERING
Sessional Examination
ANALOG ELECTRONICS CIRCUITS
V-Semester (ECE-I & II)
Time Allowed: 75 Min.
Max. Marks: 40
Note: - Attempt any four Questions. All questions carry equal marks.
1.
(a)
What do you understand by feedback in amplifiers ? List the
four basic negative feedback, configuration & indicate the
effect of feedback, on Ri & Ro in each of these configurations.
(b) Explain the term feedback factor & open loop gain with
reference to feedback in amplifiers.
2.
How do you use an op-amp as voltage to current converter ? Draw
the ckt & explain its operation.
3.
Explain the terms :
(a)
CMRR
(b)
Input offset current
(c)
Input offset voltage
(d) Power supply Rejection Ratio
(e)
Slew Rate
4.
Explain the use of an op-amp as integrator. Draw the circuit and
obtain the expression for its output voltage.
5.
Explain A.C. analysis of emitter coupled dual input, balanced-output
differential amplifier.
6.
Write short notes on any two :
(a)
Sample and Hold circuit
(b) Comparator
(c)
Logarithm amplifier
DRONACHARYA COLLEGE OF ENGINEERING
1st Sessional Examination
ANALOG ELECTRONICS CIRCUITS
V-Semester (ECE-I & II)
Time Allowed: 3 hrs.
Max. Marks: 100
Note: - Attempt any five Questions. Figures to the right indicate full marks.
1. Draw the schematic diagram of op-amp connected as :
2.
(i) A scale changer
(ii) A phase shifter
(iii) Current to voltage convertor
Also explain their working.
20
3. (a) How an op-amp can be used as an integrator. Explain?
10
(b) Draw the circuit of Schmitt trigger with waveform using op-amp &
discuss its operation?
10
4. (a) Explain the following
(i) Virtual ground concept
(ii) CMRR
(iv) Input offset voltage
(v) Offset null
(b) Explain the ideal characteristics of op-amp.
15
(iii) Slew rate
5
5. (a) Explain the working of RC coupled amplifier with the help of neat
diagram. Explain its frequency response.
15
(b) A multistage amplifier consists of three stages. The voltage gains of
stages are 30, 50, and 80. Calculate the overall gain in dB.
5
6. (a) Draw the circuit diagram of square wave generator using op-amp and
explain its operation with waveform.
10
(b) Explain the AC analysis of dual input balanced output differential
amplifier?
10
7. (a) Explain the working of op-amp based logarithmic amplifier?
10
(b) Explain the working of sample and hold circuit with waveform using op-amp?
10
8. (a) Explain gain, input resistance and output resistance of closed loop noninverting amplifier.
15
(b) An inverting amplifier has Rf = 500kΩ and R1=5kΩ. Determine the
amplifier circuit voltage gain, input resistance and output resistance if
input voltage is 0.1 V. Assume the op-amp to be ideal one.
5
9. Write short notes on (any two):
20
(a) Miller and Sweep generator
(b) ADC
(c) Transfer characteristics of op-amp.
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September-2007