Pulse Amplitude Modulation


Pulse Amplitude Modulation (PAM) is a pulse analog modulation scheme in which the amplitudes of a train of carrier pulse are varied according to the amplitude variations of message signal.

In pulse analog modulation pulse by pulse transmission will occured each of the pulse to be transmitted corresponds to baseband signal and can be directly transmitted through baseband channel only.

PAM Generation:-

  • PAM signal can be generated either using natural sampling or using flat-top sampling as shown in the figure of this video.
  • PAM Generator consists of LPF, a multiplier and a pulse generator.
  • Initially the modulation signal m(t) is passed through LPF to bandllimit the message signal.
  • The bandlimiting is necessary to avoid aliasing effect in the sampling process.


I can live without food but I can't live without teaching. I passionate about my profession. Raj Kumar Thenua, M.Tech in Digital Communication, GATE 2015 & NET 2014 Qualified, currently working as an Assistant Professor at Anand Engineering College, Agra. He has an experience of approx 10 years in academics. The areas of interest are Communication, Signal Processing, and Adaptive filters. He has received a “Shrestha Shikshak Puruskar” by Sharda Group of Institutions (SGI) in the year 2009-10 for outstanding academic performance He has the knowledge of various Engineering simulation software’s mainly MATLAB, Simulink, IE3D, Scilab, Code composer Studio. He is the active member of IETE, ISTE, IAENG, IACSIT, UACEE.


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