Pulse Amplitude Modulation Block Diagram
Given below is the Pulse Amplitude Modulation Block Diagram
Working Principle of Pulse Amplitude Modulation (PAM)
Pulse Amplitude Modulation (PAM) is a modulation technique where the amplitude of a series of pulses is varied according to the amplitude of the analog signal being transmitted.
Steps involved in Pulse Width Modulation are as follows :
With pulse amplitude modulation (PAM), the amplitude of a sequence of pulses is changed in response to the amplitude of the analog signal that is being sent. Hereās a detailed breakdown of how PAM functions:
- Sampled: Periodically the analog signals are sampled. These are called sampling intervals, and an aliasing of these has no chance if we put a condition for the sampling rate, āNyquist theoremā states that the sampling frequency must at least be twice the highest frequency component of the signal.
- Quantization: Each sample is provided with quantized amplitude. The resolution of the system is what contributes to the quantization level. For illustration, an 8ābit system has the number of possible levels being 2^8 = 256. The process of quantization speaker rounding the title of frequencies or the frequencies of alongside that are adjacent to one another is in order to reduce the loss of bandwidth and wastage of valuable information from the message signal.
- Modulation: Since each sampleās quantization level constitutes the amplitude of the generated pulses, only single pulses are produced if every sample level is integer. Often, the pulse doesnāt change its width, but its amplitude can adopt any of the quantified sample values.
- Transmission through the medium of transmission: The carrier, for example, is a visual analog signal or digital one is represented as the pulse train that is modulated. It can be transmitted through wireless or wired pathway depending on the framework of purpose that lies behind it.
- Reception: The reception results in amplitudes modulation which then undergoes a process of demodulation. Firstly, the firm needs to isolate the pulse and get the pulses strength which are represented by their amplitudes.
- Reconstruction: By the summation of different orders of the magnitudes outlined in a given position, the low frequencies are under modulated and the final rebuild into a continuous signal. This also means that it is used for the interpolation.
- Pass-through filtering: The degree of conversion of PAM is higher than that of PDM because the latter including the high-frequency components in its pulse train generation process. A low-pass filter is generally employed to take out the high-frequency components from the smooth recovered analog signal, which meanwhile preserves the original analog signal component.
Pulse Amplitude Modulation
Pulse Amplitude Modulation (PAM) is a key modulation technique used in digital communication for transmitting analog data and is one of the most widely used types of analog-to-digital conversion. Its process is simple where the amplitude of a sequence of pulses changes with the instantaneous amplitude of the analog message signal. The analog signal that is to be modulated is sampled by a sequence of pulses that are amplitude-modulated on the carrier to produce the amplitude-modulated pulses.
The analog signal is sampled at regular intervals to enable the amplitude of pulses due to be produced by the carrier to be varied. The sampled values are quantized to a specific number of quantization levels or discrete levels whereupon the process is repeated. Due to its simplicity of implementation and analysis, PAM is often employed in many applications including digital communication, audio transmission, and instrumentation among others. One of the biggest drawbacks of PCM is its sensitivity towards channel errors, as poor-quality channels will introduce noise and distortion, particularly over larger distances and lower data rates.
Table of Content
- What is PAM?
- PAM Block Diagram
- Types
- Mathematical expression
- Construction
- PAM Circuit
- Solved Examples on PAM
- Applications
- Advantages
- Disadvantages