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
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.
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 βdc=βac=100 and VBE=0.715V.
i) Determine ICQ and VCEQ values.
ii)Determine the voltage gain.
iii) Determine the input and output resistances.
RC=2.2kω, RE=4.7kω, Rin1=Rin2=50ω,
VCC=+10V, VEE-10V. The transistors have βdc=βac=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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