Download PTU B.Tech 2021 Jan ECE 5th Sem 78759 Linear Integrated Circuits Question Paper

Download PTU (Punjab Technical University) B.Tech (Bachelor of Technology) / BE (Bachelor of Engineering) 2021 January ECE 5th Sem 78759 Linear Integrated Circuits Previous Question Paper

Roll No.
Total No. of Pages : 03
Total No. of Questions : 18
B.Tech. (ECE) (Sem.?5 )
LINEAR INTEGRATED CIRCUITS
Subject Code : UC-BTEC-503-18
M.Code : 78759
Time : 3 Hrs. Max. Marks : 60
INST RUCT IONS T O CANDIDAT ES :
1 .
SECT ION-A is COMPULSORY cons is ting of TEN questions carrying TWO marks
each.
2 .
SECT ION-B c ontains F IVE questions c arrying FIVE marks eac h and s tud ents
have to atte mpt any FOUR q ues tions.
3 .
SECT ION-C contains THREE questions carrying T EN marks e ach and s tudents
have to atte mpt any T WO questio ns.
SECTION-A
Write briefly :
1)
Define virtual ground in OpAmp circuits.
2)
List features of ideal OpAmp.
3)
Define CMRR for OpAmp. What is typical CMRR value?
4)
How does negative feedback effect input impedance in non-inverting amplifier?
5)
What is the significance of slew rate in OpAmp circuits?
6)
How does zero-detector circuit work?
7)
What is PLL? Give an application.
8)
Differentiate monostable, bistable, and astable multivibrators.
9)
What are instrumentation amplifiers? List some important required features.
10) Where do we use positive feedback in OpAmp circuits? Give reasons.
SECTION-B
11) Draw labelled internal circuit diagram of OpAmp IC741.
12) Draw and explain working of OpAmp based square wave generator.
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13) Determine operating points current and voltage for the differential amplifier circuit shown
in the figure. Give parameters are :
Rs1 = Rs2 = 40
RE = 5k
RC1 = Rc2 =3k
= 100
Both BJTs are biased using 10V voltage
FIG.1
14) How Schmitt trigger circuit behaves as memory cell. Justify with suitable circuit and
waveforms.
15) What is PLL? Explain its working principle with help of block diagram.
SECTION-C
16) Draw circuit diagrams to explain working of
a) Wein bridge amplifier
b) Saw-tooth waveform generator
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17) Derive resultant expressions for followings with the help of suitable circuits.
a) R-2R D-to-A converter
b) Summing, scaling & averaging amplifier
18) Derive expressions for the following in reference to differential amplifier circuit shown in
the figure :
a) Input impedance
b) Output impedance
Given parameters are :
Rs1 = Rs2 = 40
RE = 5k
RC1 = Rc2 = 3k
= 100
FIG.2
NOTE : Disclosure of Identity by writing Mobile No. or Making of passing request on any
page of Answer Sheet will lead to UMC against the Student.
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