Jawaharlal Nehru Technological University Kakinada 2008 B.Tech Electronics and Communications Engineering electronic circuit analysis - Question Paper

(b) What is a voltage multiplier? Draw any 1 circuit of it and provide its applica-
tions. [8+8]
? ? ? ? ?









2
of 2Code No: 07A3EC14 Set No.2
II B.Tech. I Semester Regular Examinations, November -2008
ELECTRONIC CIRCUIT ANALYSIS
( Common to Electronics & Communication Engineering and Electronics &
Telematics)
Time: three hours Max Marks: 80
ans any 5 ques.
All ques. carry equal marks
? ? ? ? ?
1. (a) Draw the low frequency ? parameter equivalent circuit of a CE ampli?er and
discuss the signi?cance of every parameter.
(b) In a single stage CE ampli?er RS=1kO, R1=50k, R2=2k, RC=1K, RL=1.2k,
hfe=50, and hie=1.1k. obtain AI , Ri, Ro, and voltage gain. [8+8]
2. (a) Derive the expression for voltage gain and input impedance of bootstrap emit-
ter follower circuit.
(b) A multistage in to be constructed using 4 identical stages, every of which
has a lower cuto? frequency 15Hz and upper cuto? frequency 30kHz.
i. What will be the lower and upper cuto? frequencies of the multistage
ampli?er?
ii. If the mid band voltage gain of every stage in 8.2,What will be approximate
gain of the multistage ampli?er at 7.5Hz and at 300KHZ? [8+8]
3. (a) Derive the expression of gain bandwidth product for voltage?
(b) Short circuit CE current gain of transistor in 25 at a frequency of 2MHz if
fß=200kHz. compute
i. fT
ii. hfe
iii. obtain |Ai|at frequency of 10 MHz and 100 MHz. [8+8]
4. (a) discuss with neat circuit diagram, the working of a Transformer coupled class
A power ampli?er. elaborate its advantages and disadvantages?
(b) A class B, push pull ampli?er drives a load on 16O, connected to the secondary
of the ideal transformer. The supply voltage in 25V. If the turns on the primary
in 200 and the No. of turns the secondary in 50, compute maximum power
o/p, d.c power input, e?ciency and maximum power dissipation per transistor.
[8+8]
5. (a) Draw and discuss the circuit diagram of a single tuned capacitance coupled
ampli?er. discuss its operation.
(b) discuss the signi?cance of Gain versus frequency curve of tuned ampli?er.
Draw the ideal and true frequency response curves of single tuned ampli?er.
[8+8]
1 of 2Code No: 07A3EC14 Set No.2

Earning:   Approval pending.