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Electronics 3

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by

Ahmed Salem

on 20 May 2014

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Transcript of Electronics 3

Why Modulation
1- To get short antenna length

2- High frequancy

Comparaison between AM&FM
1- AM

- Easy to be detected (using envelop detector)
- High power dissipation in the carrier

2- FM

- Hard to be detected
- low power dissipation
Modulation Types
1- Analog

2- Discrete - time

3- Digital
Analog Signal types
1- Amplitude Modulation (AM)

2- Frequancy Modulation (FM)

3- Phase Modulation (PM)
Discrete - time
-
Pulse Modulation

1- Pulse Amplitude Modulation (PAM)

2- Pulse Width Modulation (PWM)

3- Pulse Position Modulation (PPM)

-
Pulse Coded Modulation

1- PCM
2- DPCM
3- Delta


Digital Signal
1- ASK

2- PSK

3- FSK
Electronics 3
Thank you!
Note
advantages&disadvantages of PM
is equal to FM

steps to convert the signal from analog to digital
1- Continous - time " analog "

2- Discrete - time

3- Digital signal

Amplitude Modulation(AM)
You must to know the following parts :

1- Advantages & Disadvatages
2- the wave
3- the equations of signal and carrier
4- Modulation index (M)
5- what is the meaning of AM
Frequancy Modulation(FM
1- what is a FM
2- Block diagram
3- tha wave
4- practical figure
5- equations of signal & carrier

Position Modulation(PM)
1- what is a PM
2- Block diagram
3- tha wave
4- practical circuit
5- equations of signal & carrier
6- the wave and figure differentiator circuit
PAM
PPM
PWM
1- what is a PAM & PPM & PWM
2- tha wave
5- equations of signal & carrier
Full transcript