Analyze Pulse Amplitude Modulation (PAM).
In Pulse Amplitude Modulation (PAM) message information is encoded in the amplitude of a series of signal pulses. It is an analog pulse modulation scheme in which the amplitude of train of carrier pulses is varied according to the sample value of the message signal. A train of very short pulses of constant amplitude and fast repetition rate is chosen the amplitude of these pulse is made to vary in accordance with that of a slower modulating signal the result is that of multiplying the train by the modulating signal the envelope of the pulse height corresponds to the modulating wave The PAM wave contain upper and lower side band frequencies besides the modulating and pulse signals. Figure 3.1 (a) shows the waveforms for message signal (b) shows the carrier pulse train and (c) shows the PAM signal.
Observation:The different output waveforms shown in figures 3.3 to 3.6 are observed with the help of CRO and are traced with the help of graph paper.
Conclusion:The study of pulse amplitude modulation using switching method and by sample and hold circuit has been successfully done.
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