What is Amplitude Modulation (AM)
Definition:-
Amplitude Modulation, is a system, where the maximum amplitude of the carrier wave varies, according to the instantaneous value (amplitude) of the modulating (message or baseband) signal.
Amplitude Modulation, is a system, where the maximum amplitude of the carrier wave varies, according to the instantaneous value (amplitude) of the modulating (message or baseband) signal.
What is Frequency Modulation (FM)
In case of Frequency Modulation (FM) the frequency of the carrier wave varies according to the instantaneous value of the modulating (message) signal.
Comparison of AM and FM (AM vs FM)
Why FM is better than AM
Following reasons make the Frequency Modulation (FM) better than Amplitude Modulation (AM)
AM vs FM Video (Comparison of AM and FM) Video
2.FM receivers are more immune to noise in comparison to AM receivers. since FM receivers may be fitted with amplitude limiters. These amplitude limiters can remove the amplitude variations caused by the noise.
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#AMPLITUDE MODULATION (TIME DOMAIN EQUATIONS AND WAVEFORMS)
3.In FM, it is possible to further reduce noise by increasing frequency deviation. This is not possible in case of AM, since in AM, we can not exceed 100℅ modulation without Severe distortions.
4.Standard Frequency allocations provide a guard band between commercial FM stations. This leads to less interference between adjacent channels in FM in comparison to AM.
5.In case of FM, all the transmitted power is useful but in AM, most of the power is present in carrier, that does not contain any information.
6.In FM Amplitude is constant, so does not depend on modulation depth. But in case of AM, the transmitted power is governed by the modulation depth.
This allows the use of low level modulation in FM transmitter and also we can use efficient class C amplifiers in all stages following the modulator.
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#FREQUENCY SPECTRUM OF AMPLITUDE MODULATION (WAVEFORMS AND EQUATIONS DERIVATION)
Disadvantage of FM over AM
1.Transmitting and receiving equipment used in FM mainly for the purpose of modulation and demodulation are more Complex and so more costly in comparison to AM.
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2.A channel of 200 kHz is required in FM broadcast in comparison to only 10 kHz in case of AM broadcast which is really a big drawback of FM.
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Need and benefits of modulation
Amplitude modulation (time domain equations and waveforms)
Frequency spectrum of amplitude modulation (waveforms and equations derivation)
Amplitude modulation vs frequency modulation (advantages and disadvantages)
Conventional AM vs DSB-SC vs SSB-SC vs VSB (comparison of AM systems)
Low level and high level modulation block diagram (AM transmitter block diagram)
Frequency translation / frequency mixing / frequency conversion / heterodyning (basic concepts and need)
Need and benefits of modulation
Amplitude modulation (time domain equations and waveforms)
Frequency spectrum of amplitude modulation (waveforms and equations derivation)
Amplitude modulation vs frequency modulation (advantages and disadvantages)
Conventional AM vs DSB-SC vs SSB-SC vs VSB (comparison of AM systems)
Low level and high level modulation block diagram (AM transmitter block diagram)
Frequency translation / frequency mixing / frequency conversion / heterodyning (basic concepts and need)
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