Question Paper: Analog Electronics 2 : Question Paper Dec 2015 - Electronics & Telecomm. (Semester 4) | Mumbai University (MU)
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## Analog Electronics 2 - Dec 2015

### Electronics & Telecomm. (Semester 4)

TOTAL MARKS: 80
TOTAL TIME: 3 HOURS
(1) Question 1 is compulsory.
(2) Attempt any three from the remaining questions.
(3) Assume data if required.
(4) Figures to the right indicate full marks.

### 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 marks) 1 (b) Instead of single Power Supply, why we use Dual power supply biasing for differential amplifier?(5 marks) 1 (c) Why Efficiency of class A power Amplifier is less than class B.(5 marks) 1 (d) What is the drawback of current mirror circuit using MOSFET? How it is overcome?(5 marks) 1 (e) Why we prefer series voltage Regulator over shunt voltage Regulator? Explain in detail.(5 marks) 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 marks)
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 marks)
3 (a) For the given circuit, Determine
ii) Common mode gain Ac
iii) CMRR
For BJT β=100 VBE=0.7V, VA=100V.
(10 marks)
3 (b) Draw and explain the working of class A power amplifier (Transformer coupled). Derive the expression for efficiency.(10 marks) 4 (a) Draw and explain current mirror circuit using MOSFET, for the given circuit determine the value of lref and l0 (10 marks) 4 (b) Draw the circuit diagram of Darlington pair using BJT, and derive the expression for Av, Ai, Zi and Zd.(10 marks) 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 marks) 5 (b) Draw the circuit diagram of MOS differential amplifier and derive the expression for Ad, Acm and CMRR.(10 marks)

### Write short note on (Attempt any Four:)

6 (a) High pass and low pass filter using OPAMP(5 marks) 6 (b) Cascode amplifier using BJT(5 marks) 6 (c) Widlar current source using MOSFET.(5 marks) 6 (d) Transistor shunt voltage regulator.(5 marks) 6 (e) High frequency hybrid-π model of BJT.(5 marks)