Test Paper - Electronic Devices and Circuits - II - Mumbai University - Electronics and Telecommunication Engineering - 4th Sem. - 2009, Study notes of Analysis and Design of Digital Integrated Circuits

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Can. 5250-09. (REVISED COURSE) SP-

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. [Total Marks: 100

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I N.B. : (1) QuestionNos.1 and 2 are compulsory. Answer any three questionsfrom the remaining.

(2) Assumethe missing data suitably. 52'".3C!) ~ S'~ 0

(3) Draw neat, labeled diagrams wherever necessary.

1. Design a 2 stage RC Coupled Amplifier using BC 147 for the following data :-

Av =1000, Sica ~ 8, FL ~ 15Hz, Vcc =16V. Find (VO)max'Rin' Ro and total current drawn from the supply. Given :- hie = 2.7 KO, hoe = 18J.l~ hfe = 200, hre = 1.5 x 10-4. Draw the diagram with their designed valves.

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2. (a) Find the upper, lower cut-off frequency, Bandwidth and gain-bandwidth product 12 for the circuit shown below. Sketch the frequency response. Given Cbe = 35 pF, Cbe = 5 pF, Cee = 1 pF, C?wi= 5 pF, Cwo = 8 pF, ro = 00. (b) Design a class B power Amplifier with the following specifications. 8 Output power = 10 watts. RL = 8 0, Vee = 12 V. Calculate the overall efficiency at the full load.

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3. (a) With neat diagrams explain the various kinds of feedbacks and find their Ri' Ro, 12 Av and Ai'

(b) Design a RC phase shift oscillator using FET, having gm = 8000/Jl15. rd = 40 KO 8 to generate a signal of 1.5 KHz.

3. (a) With neat diagrams explain the various kinds of feedbacks and find their Ri' Ro, 12 Av and Ai'

(b) Design a RC phase shift oscillator using FET, having gm = 8000/Jl15. rd = 40 KQ to generate a signal of 1.5 KHz.

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4. (a) Derive an expression for the small signal voltage gain of a dual input, single output 12 differential amplifier with neat relevant diagrams.

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Con. 5250-SP-7847-09. 2

(b) Calculate the voltage gain of the following circuit with and without feedback. 8

Identifythe type of feedback. 16 V. ~

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5. (a) Forthe bistable multivibratorcircuit,shown below,calculate the state slote voltages 12

and currents. Explain the function of catching diodes and speed up capacitors in

the circuit. 6v

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(b) What is a heat sink? Why is it required for power amplifiers? Show the relationship 8

between thermal and electrical analogy with a neat sketch.

6. (a) Derive an expression for the frequency of oscillation of a RC phase shift oscillator 8

using FET.

(b) Explain harmonic distorsion and crossover distorrion in power Amplifier.How are 12

they overcome?

7. Write short notes on :-

(a) Class C amplifier (b) Darlington pair - (c) Clapp oscillator (d) Merits and demerits of negative feedback amplifier.

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