MU Analog Electronics 2 - December 2015 Exam Question Paper

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 V_BE=07 V and β=100, V_A=0V, Determine
a) Q point of BJT
b) Time constant associated with C_C1 and C_C2
c) Lower cut-off frequency due to C_C1 and C_C2.

10 M

2 (b) For the PMOS CS amplifier, transistor parameters are V_TP=-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 V_BE=0.7V, V_A=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 l_ref 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 A_f and find V_o 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 A_d, A_cm 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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