Pulse Amplitude Modulation (PAM)

 Pulse Amplitude Modulation (PAM)

[1] What Is PAM ?

- Pulse Amplitude Modulation Is The Basic Form Of Pulse

  Modulation.

- In This Modulation, The Signal Is Sampled At Regular Intervals

  And Each Sample Is Made Proportional To The Amplitude Of The

  Modulating Signal.

- The PAM Signal Follows The Amplitude Of The Original Signal,

  As The Signal Traces Out The Path Of The Whole Wave.

- Here, A Signal Which Is Sampled At The Nyquist Rate Can Be

  Reconstructed By Passing It Through An Efficient Low Pass

  Filter (LPF) With An Exact Cutoff Frequency.

- It Is Very Easy To Generate And Demodulate PAM.

- This Technique Transmits The Data By Encoding The Amplitude

  Of A Series Of Signal Pulses.

- There Are Two Types Of PAM

(1) Single Polarity PAM: A Fixed DC Level Is Added To The Signal

      So That The Signal Is Always Positive.

(2) Double Polarity PAM: Here, The Pulses Are Both Positive

      And Negative.

 

[2] Advantages & Disadvantages Of PAM :

 

Advantages :

- Both Modulation And Demodulation Are Simple.

- Easy Construction Of Transmitter And Receiver Circuits.

 

Disadvantages

- Noise Interference Is Higher.

- It Is Difficult To Remove Noise, As This Will Affect Amplitude

  Part Which Carries Information.

- It Has Lowest Power Efficiency Among All Three Types.

- Instantaneous Power Of Transmitter Varies.

- Transmission Bandwidth Is Too Large.

 

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