ANALOG ELECTRONIC CIRCUITS(15EC32) - QUESTION BANK
ANALOG
ELECTRONIC CIRCUITS(15EC32)
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Module -1
BJT AC Analysis: BJT AC
Analysis: BJT Transistor Modeling, The re transistor model, Common emitter
fixed bias, Voltage divider bias, Emitter follower configuration.
Darlington connection-DC bias; The Hybrid equivalent model, Approximate
Hybrid Equivalent CircuitFixed bias, Voltage divider, Emitter follower configuration; Complete Hybrid equivalent model, Hybrid π
Model.
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1.
Derive the expression for input impedance,
output impedance and voltage for common emitter bias configuration using re
model (08MARKS)DEC-2017-JAN-2018
2.
Draw the graphical symbol and hyb rid
equivalent model for CE and CB configuration model (04MARKS)DEC-2017-JAN-2018
3.
Derive the expression for zi, zo and Av for emitter follower
configuration using re model (08MARKS)DEC-2017-JAN-2018
4.
Draw re and h parameter models of a transistor in CE configuration.
Also give relationship between re and h parameter models. (5MARKS)JUNE/JULY2017
5.
Draw the emitter follower circuit. Derive the expression for zi, zo
and Av using re model. (6MARKS)JUNE/JULY2017
6.
Draw and explain hybrid model of a transistor in CE configuration
mentioning the significance of each component in model. (5MARKS)JUNE/JULY2017
7.
Derive the expression for zi, zo, Av and Ai for common emitter
fixed bias configuration using hybrid equivalent model. (8MARKS)JUNE/JULY2017
8.
Obtain frequency response of CE
amplifier circuit and find out its band width. What is the impact of CC and CS on the band width? (10MARKS)DEC-2016-JAN-2017
9.
Draw the low frequency hybrid
equivalent. Circuit for CE & CB amplifier. (8MARKS)DEC-2016-JAN-2017
10. Give the approximate h-parameter conversion formulae for CB and CC configuration
in terms of CE (8MARKS)DEC-2016-JAN-2017
11. Give the procedure to form the approximate h – model from exact h –
model of amplifier (6MARKS)DEC-2016-JAN-2017
12. Draw the small-signal equivalent circuit for an emitter follower stage
at high frequencies and obtain the voltage gain. (8MARKS)DEC-2011-Jan-2012
13. Discuss the effect of coupling capacitor (Cc)on low frequency response of CE amplifier. (4MARKS) DEC-2011-Jan-2012
14. For a CB transistor amplifier driven by a voltage source of internal
resistance Rs = 1.2k the load impedance is resistor RL = 1k. The h-parameters
are hib =22., hfb= - 0.98, hob = 0.5 μA/V, hrb= 3 × 10−4. Calculate AV, AI ,and
RI. (4MARKS)DEC-2011-Jan-2012
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15. Draw the circuit diagram of common source amplifier with un bypassed Rs
and derive voltage gain and output resistance. (10MARKS)JUNE-JULY-2014.
16. Explain the method of evaluating h parameters for a transistor in CC
configuration.(8MARKS)JUNE-JULY-2013
17. A CB amplifier is driven by a voltage source of internal resistance
Rs=1k.The load impedance is RL=1K. The transistor parameters are hib= 22, hfb=
-0.98, hrb=2.9×10−4, hob= 0.5μ A/V. Compute current gain, voltage gain,input
and output impedance of the amplifier. (8MARKS)JUNE-JULY-2012
18. Draw the circuit diagram of small signal CE amplifier circuit and give
its equivalent hybrid model. What is the role of Cc and Ce. (10MARKS)DEC-2012-Jan-2013
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Module -2
Field Effect Transistors: Construction
and Characteristics of JFETs, Transfer Characteristics, Depletion type
MOSFET, Enhancement type MOSFET. FET Amplifiers: JFET small signal model,
Fixed bias configuration, Self bias configuration, Voltage divider
configuration, Common Gate configuration. Source-Follower Configuration,
Cascade configuration.
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1. Explain the
construction and working principle of n-channel JFET and draw the
characteristics (06 MARKS)DEC-2017-JAN-2018
2. Derive the
expression for zi, zo and Av for FET self bias configuration with bypassed Rs (06 MARKS)DEC-2017-JAN-2018
3. Distinguish between
Depletion type and enhancement type MOSFET(04 MARKS)DEC-2017-JAN-2018
4. Explain the
construction and working principle of n-channel Depletion type type MOSFET and
draw the characteristics curve (08 MARKS)DEC-2017-JAN-2018
5. With circuit
diagram of JFET small signal model determine gm and rd(8MARKS)JUNE/JULY2017
6. For the JFET CS
amplifier with fixed bias configuration. Derive the expression for zi, zo and
Av using ac equivalent circuit. (8MARKS)JUNE/JULY2017
7. With neat diagram
explain construction of n-channel JFET, and also draw its characteristics. (8MARKS)JUNE/JULY2017
8. Draw the char of
n-channel Enhancement MOSFET (3MARKS)DEC-2016-JAN-2017
9. Give the symbol of
n&p channel FET,MOSFET.
(3MARKS)DEC-2016-JAN-2017
10. A Common source FET
amplifier with unbypassed Rs has following parameters
a. VDD=20V, Rd=15KΩ,
Rs=0.5KΩ, Rg=1MΩ, rd=5KΩ, gm=5ms
b. Calculate (i)input
resistance(Ri) (ii)output resistance(Ro) (iii)Voltage gain(Av)(8MARKS)DEC-2011-Jan-2012
11. Explain performance
of FET as VVR. (3MARKS)DEC-2011-Jan-2012
12. With neat diagram
explain working of Darlington connection.(6MARKS)JUNE-JULY-2014
13. Describe the
construction & operation of depletion mode MOSFET & draw its
characteristics. (8MARKS)JUNE-JULY-2014
14. Draw & explain
small signal model of common source , common Gate & common Drain amplifier. (8MARKS)JUNE-JULY-2013
15. Describe the
construction & operation of Enhancement MOSFET & draw its characteristics. (8MARKS)JUNE-JULY-2012
16. Explain with the
help of neat diagram construction, working & VI characteristics of n
channel JFET. (10MARKS)JUNE-JULY-2013
17. Why do depletion
regions do not touch of pinch off?(3MARKS)JUNE-JULY-2013
18. Depletion MOSFET is
called normally ON MOSFET. Why?(2MARKS)DEC-2012-Jan-2013
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Module -3
BJT and JFET Frequency Response: Logarithms,
Decibels, Low frequency response – BJT Amplifier with RL, Low frequency
responseFET Amplifier, Miller effect capacitance, High frequency response –
BJT Amplifier, High frequency response-FET Amplifier, Multistage Frequency
Effects.
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1.
Derive an expression for low frequency
response of BJT amplifier due to capacitors Cs and Cc (8MARKS)DEC-2017-JAN-2018
2.
Derive an expression for millers input
and output capacitance (8MARKS)DEC-2017-JAN-2018
3.
Obtain the expression for overall lower
and higher cut off frequencies for
multistage amplifier (8MARKS)DEC-2017-JAN-2018
4.
Describe miller effect and derive an
equation for miller input and output capacitances. (8MARKS)JUNE/JULY2017
5.
Discuss low frequency response of BJT amplifier and give expression
for low frequency due to input coupling capacitor and output coupling
capacitor. (8MARKS)JUNE/JULY2017
6.
Explain high frequency response of FET
amplifier and derive the expression for cutoff frequency defined by input and
output circuits. (8MARKS)JUNE/JULY2017
7.
Summarize the gain, input impedance and
output impedance of single stage BJT amplifier using mid band analysis. (8MARKS)DEC-2016-JAN-2017
8.
How to make the Emitter Coupled
Differential Amplifier circuit and also explain that operation. (8MARKS)JUNE-JULY-2016
9.
Define CMRR of BJT differential
amplifier. How to improve it.(3MARKS)DEC-2011-Jan-2012
10. State and prove the
Miller’s theorem, and also give examples. (6MARKS)JUNE-JULY-2016
11. What is the
importance of Darlington circuit
(2MARKS)JUNE-JULY-2016
12. Construct a CE amplifier and analyze ac parameters of its hybrid
equivalent circuit. (6MARKS) JUNE-JULY-2015
13. Design a cascade
amplifier and its ac equivalent circuit
(5MARKS)JUNE-JULY-2015
14. Draw the low
frequency equivalent circuit of FET
(4MARKS)JUNE-JULY-2014
15. Find CMRR of differential amplifier with differential gain 300 and
common mode gain of 0.2 (4MARKS)DEC-2012-Jan-2013
16. State miller’s
theorem. (2MARKS)DEC-2011-Jan-2012
17. Compare cascade and
cascode amplifier. (2MARKS)DEC-2011-Jan-2012
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Module -4
Feedback and Oscillator Circuits: Feedback
concepts, Feedback connection types, Practical feedback circuits,
Oscillator operation, FET Phase shift oscillator, Wein bridge oscillator,
Tuned Oscillator circuit, Crystal oscillator, UJT construction, UJT
Oscillator.
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1.What will happen when a step input
voltage is applied to the high pass RC Circuit?
1.
What are the advantages of negative
feedback in amplifiers (04MARKS)DEC-2017-JAN-2018
2.
Derive an expression for Zif
and Zof for voltage series feedback connection type (6MARKS)DEC-2017-JAN-2018
3.
Draw the circuit diagram of uni junction oscillator and
explain the principle of operation and draw the characteristics curve (06MARKS)DEC-2017-JAN-2018
4.
With a neat circuit diagram explain the
working of colpitts oscillator using transistor (06MARKS)DEC-2017-JAN-2018
5.
What is Barhausen criterion? Explain how
oscillations start in an oscillator. (04MARKS)JUNE/JULY2017
6.
With a neat circuit diagram explain the
working of colpitts oscillator using transistor. (08MARKS)JUNE/JULY2017
7.
Explain the characteristics of a quartz
crystal. With a neat circuit diagram explain the crystal oscillator in parallel
resonant mode. (08MARKS)JUNE/JULY2017
8.
Explain Clapp’s oscillator and derive
the expression for frequency of oscillation. Also explain how frequency
stability can be improved Clapp’s oscillator
(8MARKS)DEC-2016-JAN-2017
9.
Explain Hartley oscillator and derive
the equation for oscillation?(8MARKS)DEC-2016-JAN-2017
10. Explain pierce crystal oscillator and derive the equation for
oscillation?(8MARKS)DEC-2016-JAN-2017
11. Explain RC phase shift oscillator? (3MARKS)JUNE-JULY-2016
12. Explain current series feedback amplifiers? (4MARKS)JUNE-JULY-2015
13. With simple diagrams explain the operation of negative resistance
oscillator using tunnel diode? (4MARKS)JUNE-JULY-2015
14. Explain voltage shunt feedback amplifiers? (4MARKS)DEC-2012-Jan-2013
15. Explain the relevant information, how the negative feedback improves
stability reduce noise and increase input impedance? (6MARKS)DEC-2011-Jan-2012
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Module -5
Power Amplifiers: Definition and
amplifier types, Series fed class A amplifier, Transformer coupled class A
amplifier, Class B amplifier operation and circuits, Amplifier distortion,
Class C and Class D amplifiers. Voltage regulators: Discrete transistor
voltage regulation - Series and Shunt Voltage regulators.
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1.
With circuit diagram, explain the
operation of transformer coupled class A power amplifier and show the maximum
efficiency of 50% (06MARKS)DEC-2017-JAN-2018
2.
Define voltage regulator. Explain series
voltage regulator (06MARKS)DEC-2017-JAN-2018
3.
Explain the operation of class B push
pull amplifier and show the maximum
efficiency of 78.5% (08 MARKS)DEC-2017-JAN-2018
4.
Explain series fed class A
amplifier and show the maximum
efficiency of 25% (08MARKS)JUNE/JULY2017
5.
Explain with circuit diagram the
operation of class B push pull amplifier
using complementary symmetry transistor pair. Also mention advantages
and disadvantages of the circuit. (08MARKS)JUNE/JULY2017
6.
What do you understand by multistage
transistor amplifier?(2MARKS)JUNE-JULY-2016
7.
What is need to of multistage transistor
amplifier? (3MARKS)DEC-2016-JAN-2017
8.
Explain the term frequency response with
respect to two-stage transformer-coupled amplifier. (8MARKS)DEC-2016-JAN-2017
9.
What are the advantages of frequency
with respect to two-stage amplifier? (6MARKS)DEC-2016-JAN-2017
10. The gain of the second amplifier in case of two-stage amplifier is low.
Comment. (4MARKS)JUNE-JULY-2016
11. A multistage amplifier employs 3 stages each of which has a power gain
of 30. What is the total gain of the amplifier in db? (8MARKS)JUNE-JULY-2015
12. A multistage amplifier employs 4 stages each of which has a power gain
of 20. What is the total gain of the
amplifier in db? (8MARKS)JUNE-JULY-2014
13. The input power to an amplifier is 20 mw while output power is 2.5 W.
Find the gain of the amplifier. (6MARKS)DEC-2012-Jan-2013
14. The input power to an amplifier is 10 mw while output power is 1.5 W.
Find the gain of the amplifier. (4MARKS)DEC-2011-Jan-2012
15. The absolute gain of an amplifier is 30; find its decibel in gain. (4MARKS)DEC-2011-Jan-2012
16. The absolute gain of an amplifier is 40; find its decibel in gain. (4MARKS)DEC-2011-Jan-2012
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