6th Semester Electronic and Communication Engineering (June/July-2015) Question Papers

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Derive an expression for output SNR of the quantizer and show that (SNR)o = 6u - 7.2 in
decibels if a sinusoidal signal is quantized. (08 Marks)
Explain the need for non-uniform quahtization. Also explain p-law and A-law companding.
,,. (07 Marks)
A signal Mr(t) is band limit-ed- 3.6kHz and three other signals Mz(t), M:(r) and Ma(t) are
band limited to l.2kHz. These signals are to be transmittedby means of TDM.
i) Set up a scheme for realizing this multiplexing requirement, with each sampled signal
at its Nyquist rate
ii) What must be the speed of the commutator in samples/sec?
iii) Determine the minimum bandwidth of the channel.
lOEC/TE61
2015
(05 Marks)
For the given binary sequence 101000110101, draw the digital format waveform
correspbnding to i) ON-OFF signaling; ii) RZ bipolar signaling; iii) Manchester code;
iv) NRZ polar signaling; v) NRZbipolar signaling. (05 Marks)
What is the differences between PCM and DPCM? Briefly explain the operation of DPCM
system with neat block diagram along with relevant .*pmriorrr. (08 Marks)
Derive an expression for power spectral density of bipolar NRZ format and plot the same
with respect to frequency. (07 Marks)
Explain the following terms with related equations and diagram with respect to baseband
data transmission: i) ISI ii) Raised cosine spectrum. (10 Marks)
Draw and explain modified duo binary techniques. Specify how the error propagation is
eliminated. (07 Marks)
A multilevel digital communication system transmits one of the sixteen possible levels over
the channel every 0.8 ps.
i) What is the minimum number of bits corresponding to each level?
ii) What is baud rate?
iii) What is bit rate?
tla
6 $"m F-LC
Sixth
Time: 3 hrs. Max. Marks:10O
Note: Answer any FIVE full questions, selecting
atleast TWO questions from each part.
PART - A
State sampling theorem. Write the equations for the spectrum of finite energy g(t) sampled
at L/ZW sec. and g(0, if W is the highest frequency content of g(t). Sketch g(f) and sampled
signal g,(0. (08 Marks)
b. The signal g(t) = 10 cos (20nt) cos (200nt) is sampled at the rate of 250 samples per second.
i) Determine the spectrum of the resulting sampled signal;
ii) Specify the cutoff frequency of the ideal reconstruction filter so as to recover g(t)
from its sampled version. :j;, _i
iii) What is Nyquist rate for g(t). i . ' (04 Marks)
c. Explain how practical sampling is different from ideal sampling. Derive an expression for
the flat top sampled signal. (08 Marks)
1af )
(03 Marks)

2. 10ECruE61
PART-B
5 a. Draw the block diagram for QPSK transmitter and receiver. From the basic principles prove
(10 Marks)
b. Explain in detail along with the block diagram a coherent FSK tansmitter and receiver. ,,, ,1.,,,,
(06 Marks)
c. The data transferred in PSK is with data rate of lMbps. It is desired to have P. S t0
a
with
PSD at 10-12 N/FIz. Determine average carrier power required at the receiver input' if the
detector is coherent. erfc(3.5) = 0.002. (04 Marks)
a. With a conceptu alized model of digital communication system, explair Gram-Schmidt
ortho gon alization proc edure. (10 Marks)
b. Three signals sr(t), sz(t) and s3(t) are as shown in Fig.Q.6(b) below..Apply Gram-Schmidt
procedure to obtain an orthonormal basis for signals. Express the signals sr(t), sz(t) and s3(t)
in terms of orthonormal basis function. Also give the signal constellation diagram.
(10 Marks)
that BER for QPSK is
)"rtrt,ffi)
.fl r't f-ol
Jf-l -t;
I--I+",,'' Fig.Q.6(b)
7 a. Explain t
b. Consider
,(,) =
iol
he properties of matched filter. (10 Marks)
a signal s(t) defined.by,
;0St<T _j.;,.':,
, _-_.r-_,__. J-L,.,i#proposed to approximate the matched filter for this signal by a
;;, ::r
lowpassRCfi1tera#iliobythetransferfunctionH(f)=+,wheref^=^Lis, :' .,' I + j(f lf
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-o 2nRC
the cutoff frequency of RC filter.
i) Determine optimum value of fo for which the RC fitter becomes the best
approximation for matched filter.
ii) Dbtermine the peak o/p signal to noise ratio assuming noise is AWG of zero mean and
,, ..,. power density NJ2.
.* ii'i) Determine by how many decibels the transmitted energy be increased so that the
_'* performance becomes same as that of perfectly matched filter. (10 Marks)
a. Explain the properties of maximum length sequence for a sequence generated from
3-voltage shift register with linear feedback. Verify these properties for the PN sequence
01011100101110 and also determine the period of the given PN sequence. (08 Marks)
b. Explain the principle of direct sequence spread spectrum system. (05 Marks)
c. Explain with neat block diagram the working of frequency hop transmitter and receiver.
(07 Marks)
8****
2 of 2

3. USN
Time: 3 hrs.
Sixth S'emester
Write the memory matr, i'1-the TPA in l
brief.
Explain the based, indexe,J, i:as: ,r",,i.
suitable diagrams and examples.
I
lOEC/TE,62
Max. Marks:100
PART _ A
personal conlpuier and explain each of the areas in
(10 ilarks)
;C .:,r1 ,*1tti ,e addressing modes of 8086 with
(10 N{arks)
[],,11. Degree ..{lxanoinatiCIn, June/Ju[y 2015
Micropff'scessors
Note: Answer any FIV'il full questions" selecting
otleast TWO qutt:;tiotis /rom esclt parl
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b. Write the f'lowchart and assembly language prograrn se{rrnenl to sort numbers
in descending order usi:ir; l;r"rbbie sort. 11s:: I as ir:de>..
Write an assembly lanq',.rage program sr.:nient to cerfonl
digit l0's cornplement nunrbers, whc,.,3 upl, Ltpz and
variable mentory locations.
(DX) <- up | + upZ - up3 on two
up3 are unpacked two byte data
(10 [Iarks)
in an array A
(10 Ntarks)
a. Write an assernbly language program segment to lriove
overlapping areas and explain with diagi erns of overiapping.
b. Compare procedure ilt,J macro.
c. Write an a.stsembly lanq't.y.:1 pt'i[iit,,'-!t :r' :r",lcilt io 1ro{a'.1.a+.a
VAI{4 to VhR3 using lv{Oi/E 4.zrCtlr.. (argunre: r.s).
a block of data betu'een two
(10 Vtarks)
(04 Plarks)
trom VAR2 to VAR1 antl also
(Gti NIanks)
rows ano [, - bit
press, de-bounce
(10 NIarks)
microcomputer.
(10 VIarks)
a. Draw the' intet:'t-t0t vs,:f'''- ':bi: an,i r',"ie t1,: Itc{-lr,tellce of operatio:rs that are p:rformed
when an interrupi is rec., i': zecl. (10 xlarks)
b. Write the assembly langr"rage progr?r1t .:r.r-llrreri::; to set t:re trap flag and to reset the trap flag.
(06 Marks)
c. Write the circuit for opticnlly detectin:. the presence of e new printed circuit -board as it
coll'les or,rt of the rnachine and keep fi irouflt cl' finished boards, so that we can count any
' board lost in the machine u,,hen a bca,'' nflsscs hetu,err I ED and phototransistor it sl.rould
signal the I-{MI input oi'llCt,6. illg,lzfyl ; ) ope ri}ticn oicircuit. (04 iltarks)
.]ART -_ B
a. Interface a 4 x 4 rnatrix keyboard to 8{;86 through 4 - bit output port {,rr
input fbr columns. Draw tire flou,cirart ald expiatn tne procedure for key
and encodialg of the key pressed.
b. With a neat diagram interface the rnrritrplexe<J 4 - d;.sit LED display to
Expiain the principle of'oor:ratioo.
i ot2

4. fbr computing the
DE,/ respoctively
lOEC/TB,62
(10 Marks)
sample rnean and
r,vhere :
a. I)rarv the block diagr;rrn of 8{}E7 ancl r:r.prlatit.
b. Write the 80ti7 assenil:ly language rlf'l.gram seqtlerc,)
stanclarcl deviation and store thern ar i',i; AN and Sl'iJ __
..;:l(xi - tvtrEAN)r
Standard deviation lSTD - liE') _-
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j
samplr: (MEAI{) = r-.:- , x; , X2, - -
.,
Write the typical minirnum mocr Slrtr'i11
interconnections and explain.
Write the ALP segment to initialize, rcad
E,xplain the features oi LISB.
NI _1
contiguration of 8086 with necessary devices and
.nd write the parallel port printer *irt ou,(H#l'ut)
(06 Marks)
(04 Marks)
)(x
7a.
b.
c.
a. Discuss the fla.g regis.r':r, debug and tcsi
b. Explain the salient fearurr:s ot'80486.
c. f)rarv the block diagran: of Pentjr,iill rr:";,
registers of l0iil6.
rl0SSC,t' atiCi r.i, i;;;rin the
(06 Marks)
(06 Marks)
ftinction of each block.
(08 Marks)
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of 2

5. USN 10EC63
Sixth Semester B.E. Degree hlxamination, June/July 2015
M ic roe leetnermics Circ uits
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Max. Mark$:100Time: 3 hrs.
Note: Answer any FIVE qwestions, selecting
THR.EE from Part-A and "tWO from Part-B.
PA.R.? _ A
a. Derive the io - Vos relationship of a MOSFET for triode and saturation region. (12Marks)
b. For a MOSFET process technology with WIL = 8 pnv0.8 pm,.tox = Snm, €r = 3.9 pn - 450
cm'lv.s and v, = b.z v.
i) Find Co* and K'- .
ii) Calculate the values of V65 and VDS,nin needed to operate the transistor in the
saturation region r.vrrh a dc cumeri; ii, = iCO FrA.
iii) For the device to operate as a 1Cu0 s? iesistor find the value of V65 required for very
small Vos. (08 Marks)
a. Derive the expression for input resistance. outp,:t resistance, voltage gain and overall gain of
a grounded source arnpiifier with a ne-:,l ii rgram. (0g Marks)
b. Design the biasing circuit shorvn rn Fiy- () 2(b) 'ro estatrlish a clrain current io = 0.5mA.
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MOSpgT has vt = lV, kl(W lL) -tr rnfi lv2anCVrr: = 15V. Assume one-third Von across
Rp and R5 and neglect ctrannel ierrgiii r...;dulzi'iion ?. = 0. Determine percentage change in
value of io when MOSFET' is i'epi ate,:.n,i llr a;,",-,t,ter having vt = 1 .5V. (12 Marks)
a. Explain the operation of a MOSFET cuffent steering ci'-cuits with necessary expressions.
(10 Marks)
before and after scaling in
(10 Marks)
at voitage gain expression
(10 Marks)
Gn, of the MOS cascade
(10 Marks)
b. What is MOSFET scaling? Comprar: h^OSFET par:.meters
constant tield scaling and constant volt:rri ;caling.
a. Explain CMOS implernentation cf CS
Au = gn.1 rs1/2
b. Derive ail expressiorr fo'r the shc*", ;i;
amplifier.
aiapiifier and arrive
.uit i;'anscc,nductance

6. 10EC63
Explain operation of MOS tiiffere,riiai pa-ir with common-mode input voltage V"n, and
determine the highest ailC lowest -,';lue cf ''1.o cver which the differential pair operates
properly.
b. For a MOS differentia.l t:e.ii: in i?i: Q,5l'b).
Explain the operation and anai,vsis cf single op-amp
common rnode gain A.*.
How op-amp cir@S can be useC as sigi:ai integrator
time constants?
(08 Marks)
saturation?
to operate properly what is
(12 Marks)
(08 Marks)
(08 Marks)
(04 Marks)
difference amplifier to determine it
(10 Marks)
and differentiator and determine the
(10 Marks)
(08 Marks)
(08 Marks)
(04 Marks)
_..1_sS
'ig.{}.5rb) '
Von-Vss = 1.5V, it'"1'li,'lL).-.i'i;;r 1",/2" 121 :: Q..JV, I=0.4mA, Ro -2.5 KQneglect
channel length modulation.
i) Find Vov and V-cs ic:: eacri ii:-ilr',.si:r-'.
ii) What is the highesi value of V* fi;r rQ; and Qz to remain in
iii) If the current source i require. a :.'iir.il11u* vcltage of 0.4V
the lowest value allowed fcr Y, anci Vu"?
i.gELtr
a. Discuss v,,ith neat diagrarc the fou:li:i'ir: -'eedtra;,k tcpoicgies.
b. Explain the pioperties of i;gzil,i.r'e i<:: ,l:,-ri:k.
c. What is the general strucfr;re of tne fe ":diack amplifier?
b.
a. Describeffi circuit structure anC sta'Lic cperation of CMOS invertor.
b. With exhrnple explain PUN ani Fllld CMOS logic gate circuits.
c. Realize two input NOR. ga';e anii twc input I{AND gate using CMOS gate.
***8*
2cf2

7. 10EC64USN
Time: 3 hrs.
Sixth Semester B.E. Degree Examination, June/July 2015
Antennas and Propagation
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Note: Answer any FIW full questions, selecting .'d ;'*t
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PART-A .,*i.,
Define: i) Radiation intensity ii) Power density. Derive the-relation between these two
parameters. i' (06 Marks)
Show that the maximum effective aperature of a short dipo$................- mrcnna is 0. I 1 g ?"2 . (06 Marks)
Determine the directivity of a system, if the radiation intuniff is
D U. sin-O . sin2 0 ; for 0 < e (n, 0 < $ <n.,,.,ii,. i*
ir) Un, sin2 0 sin3 0 ; for 0 < e < Tcl2,0 < O < 2n.'u"
. o,'.li*,' -
State and prove power theorem. How powep-ffi,ptbm is applied to find power radiated by an
-tfr ,.
..'-"
Max. Marks I00
(08 Marks)
(06 Marks)
(08 Marks)
(06 Marks)
(06 Marks)
(06 Marks)
(08 Marks)
(06 Marks)
(06 Marks)
(06 Marks)
two modes of
(08 Marks)
and a4 to 1
(06 Marks)
(06 Marks)
(06 Marks)
(08 Marks)
A linear antenna affay consists of,"ft'tu;isotropic sources. The distance between adjacent
sources is )"12. The power applied to'+he anay is with equal amplitude and a phase difference
- d.. Obtain the field pattern and,,,,,,, FNBW and HPBW.
. ,r''t,'
Derive an expression fortadiation resistance of a short electric dipole.
Show that the radiationtesistance of )vl2 antenna is 73 ohms.
With the help of nea{, diagrams, explain following antennas:
i) Long-wire ante ii) Folded dipole antenna.":
"
,11'
Derive thqig$essions for field strengths Eq and Hs incase of a small loop. (0S Marks)
The radjtis
,6f
a circular loop antenna is 0.021,. How many turns of the antenna will give a
radi resistance of 35f)?
E#ffi Babinet's principle with illustrations.
.I'" PART - B
Exnlain rlifftr'ent trrnes of rectansular horn antennas Whv flarino nf walls nf waveorride ins^4^v^v.^u eJ
lrvs
v-i ivv!6iiD;i6i iiv-iii $i:!'v'iiiili.>. f Y.!,.!,j i:-i:i:6 'J: ii+i:J --.i ri-i--,A+:-+L ---
isotropic antenna in terms of it's' radiation iitensity?
Derive an expression for'array factor'..of ahanay ofn-isotropic sources.
case of horn antennas is necessary?
Describe a helical antenna with the help of a neat diagram. Explain its
operation with relevant equations.
Find number of elements in a log-periodic dipole anay with TdBi gain
bandwidth. The scale constant K : I .2 for apex angle of 15o.
Explain the construction and working of lens antenna.
With neat diagram, explain embedded antenna.
Explain following antenna types with neat sketches:
i) Ultra wide band antenna ii) Plasma antenna.

8. 108C64
7 a. Derive an expression for space wave field intensity and show that it varies sinusoidally.
(08 Marks)
b. Explain duct propagation with diagram. (06 Marks)
c. A free-space LOS (Line-of-Sight) microwave link operatingat l0 GHz consists of a transmit
and a receive antenna each having a gan of 25dB. The distance between the two antenn-4"ffidq
30km and the power radiated by the transmit antenna is 10W. Calculate the path lops,"ffi?fb
link and the received power.
,_ ,r5f*.u.,
8 a. Explain the mechanism of ionospheric propagation. Also derive an expgris$bn for the
refractive index of an ionospheric layer. +r,,,,,,*
'+ (0g Marks)
b. Discuss the effect of the earth's naagnetic field on ionospheric propagatieg':' * (06 Marks)
c. Calculate the angle of incidence and the maximum single-hop disianCe for a sky wave
iri i.'r ''
(06 Marks)reflected from the E-layer with height 'h' : 100 km.
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2 of 2

9. USN
2015
Max. Mad<s;,l00
1oEC65
(O9 Marks)
(04 Marks)
loading of a page.
(07 Marks)
(10 Marks)
(05 Marks)
(05 Marks)
Sixth Semester B.E. Degree
Operating
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Time: 3 hrs.
2a.
b.
c.
3a.
b.
c.
4a.
b.
c.
Note: Answer any FIW full questions, selecting
atleast TWO questions from each part-
,,
' ,
.
,''" ,,,.
l-
;it::
! ,tl.' '';::
Discuss the common tasks performed by an operating system (Ol (05 Marks)
Explain the resource preemption, resource allocation strategips of an OS. (07 Marks)
What is a distributed syitem? Discuss the key concepts, techniques and benefits of
distributed os' ::- i'jo (08 Marks)
Explain the functions of an OS. (04 Marks)
Explain the kernel based operating systemwitha structure of time sharing system. (08Marks)
exptain the following: i) System generatig[; ii) Configuration tools; iii) Dynamic
configuration of supervisor. (08 Marks)
Discuss the primary concernsireaso-hg$r process termination. (05 Marks)
List the events occur during the b$-ofation of OS. With a dragram discuss the event handling
actions of kernel. ,,j.. (08 Marks)
With a diagram, explain 'fu relationship between threads and processes. Discuss the
advantages of threads, ,"'
= (07 Marks)
j "::jj'
Explain the lazy b allocator and slab allocator (08 Marks)
With a diagram,t4lain the merging of free memory areas using boundary tag. (08 Marks)
Compare -heflr'een contiguous and non-contiguous memory allocation. (04 Marks)
,.
.'1.'i, PART - B
a. W{th a dragram explain the following:
1) Practical page replacement policy.
ii) Page replacement policy using clock algorithms.
b. Explain with a diagram, the copy_on_write for shared pages.
c. With a dragram, explain the virtual memory manager's actions in demand
a. Explain the following write a diagram:
i) Linked allocation
ii) File allocation table
iir) Indexed allocation.
b. Explain the operations performed on files.
c. Discuss with a diagram the directory trees of a file system.
I of 2

10. 7a.
b.
With a neat diagram, explain the event handling and scheduling.
Determine the mean turn around time and mean weighted turn around
scheduling for the following table:
10EC6s
(08 Marks)
for LCN and STG
(08 Marks)
(04 Marks)
(07 Marks)
(08 Marks)
(05 Marks)
Processes Arrival time (sec.) Execution time (sec.) Dead line time (sec.)
Pr 0 03 04
Pz 2 03 t4
P: 3 02 06
P+ 5 05 11
Ps 8 03 L2
c.Discussthetwofundamenta1techniquesofscheduling.
attt',. '
a. Explainthefollowing: , ,,, ,
,'-".'
i) Inter process message control block.
ii) Exceptional conditions on message passing.
b. Explain the message queues and sockets for inter prose.ss communication in unix.
c. Explain a mail box with its features and advantages.
':
* >l< :k'":F {<
2 of 2

11. USN
a
10EC666
Sixth Semester B.E. Degree Examination, June/July 2015
Digital System Design Using Verilog
Time: 3 hrs. Max. Marks: lO0
Note: Answer any FIVE full questions, selecting
atleast TWO questions from each part.
:. .
o ltage,.r'*:;* tr.rrro td vo ttages and nois#gins ?
Develop a verilog model for a 7-segment decoder. Include an ddi;i;;;l input, Jf#,u[i*
overrirdes the BCD input and caus.t utt segments not to be lit. . -' ' (08 Marks)
Explain a simple digital system design methodology. ,., (08 Marks)
b.
c.
a.
b.
c.
How rnany address bits does it require?
Expt& the procedure to manufacture I.C.
Explain the internal organization of a CPLD.
(04 Marks)
(08 Marks)
(08 Marks)
among four unsigned 6-bit
(04 lVlarks)
(08 Marks)
4-bit gray code to a 4 bit
(08 Marks)
(04 Marks)
(08 Marks)
(08 Marks)
(04 Marks)
(08 Marks)
(08 Marks)
(04 Marks)
(08 Marks)
(08 Marks)
(04 Marks)
(08 Marks)
(08 Marks)
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2 a. hnplementthe following function f using sum-of-produ-ct form: f = (* *y.;) (-)
b. Explain the technique of using parity for error de-teetion.
c. Explain the verification of combinational circ11@''
a. Develop a verilog model of a 4-to-1 multiplexer that selects
b. Design a 4-hit carry look ahead adder.
c. Develop a verilog model of a code converter to convert the
unsigned binary integer.
a. Design a circuit for a modulo 10 counter. (04 Marks)
b. What is a finite state machine? Explain circuit structure for a finite state machine. (0B,Marks)
c. Explain the clocked synchronous timing methodology. (08 Marks)
:1 PART_B:
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If a memory'has 32,768 locations, each of 32 bits, what is the total capacity of the memory?
a. '''
What are the elements of an embedded computer?
b. Explain arithmetic, logical, shift and memory instructions.
c. Describe the interface between 8051 microcontrollerwith SRAM.
a. Explain the working of successive approximation ADC.
b. Discuss the modeling tristate drivers in verilog.
c. Explain serial interface standards with example
a. What is parallelism? Explain pipelined organization of an accelerator.
b. Discuss sobel edge detector for edge:detection in video images.
c. Explain prototypical design flow including hardware/software co design.
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