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MUMBAI UNIVERSITY
Semester Examination – Nov/Dec-2019
Branch: B. E. (Electronics & Telecommunication Engineering-CBCGS)-Sem-3
Subject (Subject Code): ANALOG ELECTRONICS-2 (39201)
Date: 04/12/2019
Time: 3 Hrs.
Marks: 80
Instructions to the Students :
- Question no. 1 is compulsory.
- Solve any three questions from the remaining 5.
- Use of non-programmable scientific calculators is allowed.
- Assume suitable data wherever necessary & mention it clearly.
Q.1. Attempt any 5 questions(20).
a)What is the major limitations of class B power amplifier & how to overcome the same ?
b)Compare series & shunt voltage regulators.
c)Draw high frequency hybrid pi equivalent circuit of FET & define various components in the model.
d) draw the circuit diagram of Widlar current source & derive the relationship between output current & reference current.
e) Compare ideal & practical OPAMP.
f) Define differential & common mode gain & differential & common mode input impedance of the differential amplifier.
Q.2.
a) Determine the corner frequency & maximum gain of MOSFET amplifier, For the circuit shown in fig 2 a) the parameters are RS=3.2KOhm, RD=10Kohm, RL=20Kohm& CL=10pF.The transistor parameters are VTP=2V,KP=0.25mA/V2 & lamda=0 .Consider IDQ=0.5mA & VSGQ=3.41V. [10M]
b) Determine unikty gain bandwidth of N channel MOSFET with parameters Kn=0.25mA/V2, VTN=1V, Lamda=0,Cgb=0.4pF & Cgs=0.2pF. Assume the transistor is biased at VGS=3V. Calculte Miller capacitance & 3dB frequency of the circuit when 10Kohm load is connected to the output. [10M]
Q.3.
a)Draw circuit diagram of two stage common emitter amplifier (CE-CE) and derive overall voltage gain , current gain, input resistance & output resistance using hybrid pi equivalent circuit. [10M]
b)Draw circuit diagram of MOSFET based differential amplifier & derive expression for differential voltage gain, common mode gain & CMRR. [10M]
Q.4. (20).
a)Draw the circuit of OPAMP based intergrator circuit & derive the expression for output voltage. What are the limitations of integrator circuit & how to overcome the limitations?
b) Draw the circuit diagram of Darlington pair amplifier using BJT & derive the expression for Av,Ai,Zi &Zo
Q.5. (20).
a) Draw & explain the working of class B power amplifier .Explain its working with the help of waveform & derive expression for power conversion efficiency.
b) Draw the circuit diagram of Adder using OPAMP & derive expression for its output voltage.
Q.6. (20)
Write a short note on:(Attemp any 4)
-
- Wilson current sources
- Power MOSFET
- Cascode Amplifier
- Differentiator using OPAMP
- Class C power amplifier
Paper End