Total marks: --
Total time: --
INSTRUCTIONS
(1) Assume appropriate data and state your reasons
(2) Marks are given to the right of every question
(3) Draw neat diagrams wherever necessary


1(a) Explain the concept of Load Line.
2 M
1(b) What is Miller Capacitance? Explain its effect on voltage gain.
2 M
1(c) Explain High Frequency Model (hybrid-π) for BJT.
3 M
Solve any one question from Q.1(d) & Q.1(e)
1(d) For the emitter-stabilized bias circuit of given figure.
Determine:,
IBQ
ii)ICQ
iii) VCEQ
iv)VC
V)VC
vi)VE
7 M
1(e) Calculate the current and voltage gains of a CE amplifier having the following parameters.
hie=kΩ,hre=×10-4, hfe=50,
hoe=25×10-6mho,RS=1kΩ,RL=1kΩ.
7 M

2(a) What is the effect of negative feedback on gain stability?
2 M
2(b) Explain the Barkhausen criterion for oscillators?
2 M
2(c) Explain the types of negative feedback with circuit diagram.
3 M
Solve any one question from Q.2(d) & Q.2(e)
2(d) Sketch the circuit of a Wien bridge oscillator. Discuss its working. Wall Oscillation take place if bridge is balanced? Explain.
7 M
2(e) Draw the circuit of a Wien bridge oscillator. Discuss its working. Wall oscillation take place if bridge is balanced? Explain.
7 M

3(a) How power amplifiers are classified? Explain.
2 M
3(b) Draw a circuit diagram of a class A amplifier and explain its operation.
2 M
3(c) Draw the circuit of a push pull amplifier using complementary symmetry without transformer and discuss its working.
3 M
Solve any one question from Q.3(d) & Q.3(e)
3(d) Draw and explain the circuit diagram for a common-base amplifier using a coupled-circuit load load with both primary and secondary winding tuned. Sketch and explain the gain/frequency response for various degrees of coupling.
7 M
3(e) Write equations for a class B transformer-coupled amplifier for dc input power to the output stage, as power delivered to the transformer primary, and circuit efficiency. Show that the maximum theoretical efficiency of a class B amplifier is 78.6%.
7 M

4(a) What is the effect of cascading on bandwidth?
2 M
4(b) Write down the expression of gain and impedances in Darlington connection.
2 M
4(c) Explain the bootstapping technique.
3 M
Solve any one question from Q.4(d) & Q.4(e)
4(d) The Following specifications are given for the dual inout balanced output differential amplifier:
RC=2.2kω, RE=4.7kω, Rin1=Rin2=50ω,
VCC=+10V, VEE-10V. The transistors have βdcac=100 and VBE=0.715V.
i) Determine ICQ and VCEQ values.
ii)Determine the voltage gain.
iii) Determine the input and output resistances.
7 M
4(e) Sketch the circuit of a two-stage direct coupled common-emitter amplifier using npn BJT. Discuss the advantage of direct coupling between stages.
7 M

5(a) List the characteristics of an ideal op-Amp.
2 M
5(b) Discuss about the unity gain bandwidth and the open loop gain versus frequency curve.
2 M
5(c) Draw the circuit of adder or summing amplifier using Op-Amp and explain operation.
3 M
Solve any one question from Q.5(d) & Q.5(e)
5(d) Explain instrumentation Amplifier using Op-Amp with the aid of diagram.
7 M
5(e) For the circuit shown in figure determine the gain V0/ViAssume Op-Amp to be ideal. !mage
7 M



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