amplitude modulation (1)

7/23/2019 Amplitude Modulation (1)

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GROUP NUMBER 7

GROUP MEMBERS:

1. DHARCCANADEVI A/P DORAIRAJ 141081393

2. NUR AIN BINTI ISA 141081426

3. NURU JANNAH BINTI NORDIN 141081446

4. NOR A!UANA BINTI TAIB 141082614

". NOR AIA A!#A BINTI SUTE$NO 141081423


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AB ASSIGNMENT

G%&'( ) *+,-)%( %() % *+,-)%+( + 7V5)(, '-'( + 20$; *+,-)%( ) )%' %'-'( + 200$ )(, 10V5. C')' +- +(


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INTRODUCTION.

AM SIGNA AND MODUATIONINDE?

AM is one of the modulationtechniques where the amplitude ofthe carrier signal is changedaccordingly to the modulation index.

In the modulation process, thebaseband voice, video, or digitalsignal modies another, higher-frequency signal called the carrier,which is usually a sine wave. A sinewave carrier can be modied by the

intelligence signal through amplitudemodulation, frequency modulation, orphase modulation.

Figure ! AM, the informationsignal varies the amplitude ofthe carrier sine wave. "heinstantaneous value of thecarrier amplitude changes inaccordance with the amplitudeand frequency variations of themodulating signal.


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@ORMUA

Figure $ ! An AM wave showingpea%s &Vmax' and troughs &Vmin'.


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(n amplitude modulation, it is particularlyimportant that the pea% value of the modulating

signal be less than the pea% value of the carrier.Mathematically ,

V* V


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PROCEDURE "he circuit are connected li%e a gure ) using A*+ +oftware.

y using tune parameter, the values of , $, and /was tuned to get approximately values of 0max and 0min.

Figure )! ircuit construct using A*+ +oftware


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THEORETICA MODUATION INDE?

1uestions ! 2iven a modulating signal with modulation of 30p andfrequency of $45h6, modulating a carrier with frequency of $445h6 and40p. reate your own %ind of AM based on this input. Analy6ed theperformance of your circuit in terms of modulation index, AM envelopeand its spectrum. ompare your simulated result with theory.

74-37)0

7483730


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THEORETICA SIDEBANDS CACUATION

9hen only a single-frequency sine wave modulating signal isused, the modulation process generates two sidebands ingure :.

Figure : ! A frequency-domain display of an AM signal &voltage'.

@+*-) :

7 $44%;6 8$4%;6

7 $44%;6

amplitude modulation (1)

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