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What is the characteristics of analog signals and digital signals?

Fundamentals of Digital Electronics


Characteristics of Analog Signals and Digital Signals:

Analog Signal: Continuous electrical signal is called an analogue signal. The change in analogue signal value over time is infinite. A simple signal-generating device converts physical quantities such as pressure, dip, light intensity, noise, etc. into equivalent analogue electrical signals through transducers. The value of this signal is always changing. That is, an electrical signal whose value continuously increases or decreases with time is called an analogue signal. The figure below shows the shape of an analogue signal:



Digital Signal: The voltage level of the digital signal is isolated. The voltage level of a digital signal is expressed by two or more states. All these levels are expressed as low (Low) and high (High) or digital 0 volts. A discrete electrical signal is called a digital signal. The change in value of a digital signal with time is finite and the change in value is expressed as an integral number. The figure below shows the wave shape of a digital signal with two distinct levels. In this method, digital 0 volts is expressed as logic 0 and 5 volts as logic for positive logic.

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