MU Electronics and Telecom Engineering (Semester 4)
Analog Electronics 2
December 2015
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


Solve Any Four:
1 (a) In case of CE amplifier, why does the bandwidth of amplifier decrease with increase in gain? Support the answer with relevant mathematical equation.
5 M
1 (b) Instead of single Power Supply, why we use Dual power supply biasing for differential amplifier?
5 M
1 (c) Why Efficiency of class A power Amplifier is less than class B.
5 M
1 (d) What is the drawback of current mirror circuit using MOSFET? How it is overcome?
5 M
1 (e) Why we prefer series voltage Regulator over shunt voltage Regulator? Explain in detail.
5 M

2 (a) The Parameters of transistor are VBE=07 V and β=100, VA=0V, Determine
a) Q point of BJT
b) Time constant associated with CC1 and CC2
c) Lower cut-off frequency due to CC1 and CC2.

10 M
2 (b) For the PMOS CS amplifier, transistor parameters are VTP=-2.V, Kp=1 mA/V2, λ=0, Cgs=15 pf, Cgd=3pf
Determine
(a) Equivalent Miller capacitance
b) upper 3dB frequency

10 M

3 (a) For the given circuit, Determine
i) Differential mode gain Ad
ii) Common mode gain Ac
iii) CMRR
For BJT β=100 VBE=0.7V, VA=100V.

10 M
3 (b) Draw and explain the working of class A power amplifier (Transformer coupled). Derive the expression for efficiency.
10 M

4 (a) Draw and explain current mirror circuit using MOSFET, for the given circuit determine the value of lref and l0

10 M
4 (b) Draw the circuit diagram of Darlington pair using BJT, and derive the expression for Av, Ai, Zi and Zd.
10 M

5 (a) For the given circuit, derive the equation for voltage gain Af and find Vo for given cor
Vi Vo Ri Rf
+1 VDC ? IK 10k
+1 VDC ? IK 100K
+1 VDC ? IK 1M

10 M
5 (b) Draw the circuit diagram of MOS differential amplifier and derive the expression for Ad, Acm and CMRR.
10 M

Write short note on (Attempt any Four:)
6 (a) High pass and low pass filter using OPAMP
5 M
6 (b) Cascode amplifier using BJT
5 M
6 (c) Widlar current source using MOSFET.
5 M
6 (d) Transistor shunt voltage regulator.
5 M
6 (e) High frequency hybrid-π model of BJT.
5 M



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