Jawaharlal Nehru Technological University Kakinada 2007 B.Tech Electronics and Communications Engineering ELECTRONIC CIRCUIT ANALYSIS - Question Paper
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select IR1=25mA.
Figure 8a
(b) Draw the functional diagram SMPS and discuss its operation.
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Code No: R059210404 Set No. 3
II B.Tech I Semester Regular Examinations, November 2007
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
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1. (a) Draw the circuit diagram and low frequency equivalent circuit of common
source amplifier and derive an expression for its voltage gain.
(b) For the emitter follower circuit with RS = 0.5K and RL = 5K, compute
AI ,Ri,AV ,AV S, and R0. Assume, hfe = 50, hie =1K, hoe = 25 µA/V. [8+8]
2. (a) explain about various kinds of distortions that occur in amplifier circuits
(b) 3 identical non interacting amplifier stages in cascade have an overall
gain of one dB down at 30 Hz compared to mid band. compute the lower cutoff
frequency of the individual stages. [8+8]
3. (a) Draw Hybrid - p model for a transistor in the CE configuration and discuss
the significance of every component in this model.
(b) provided a germanium p-n-p transistor whose basewidth is 10-4 cm. At room
temperature and for a dc emitter current of two mA, obtain
i. emitter diffusion capacitance,
ii. fT [Assume Diffusion constant as 47 cm2/sec]. [8+8]
4. (a) Classify large signal amplifiers based on its operating point. Distinguish these
amplifiers in terms of the conversion efficiency. [8]
(b) Draw the push-pull power amplifier circuit. Derive the expression for the
output current in push ?pull amplifier with base current as ib = Ibm sinwt. [8]
5. (a) Draw and discuss the circuit diagram of a single tuned Capacitance coupled
amplifier. Also discuss its operation?
(b) Draw and discuss the significance of Gain versus Frequency curve of tuned
amplifiers when they are used in radio amplifiers?
(c) Draw the Ideal and true frequency response curves of a single tuned ampli-
fier? [8+4+4]
6. discuss how the stagger-tuned design is superior over synchronously tuned design
in the design of a multistage amplifier? Also draw their circuit diagrams and their
| Earning: Approval pending. |
