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8th February 2013, 03:22 PM
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Join Date: May 2012
Re: Digital Electronics Notes B.Tech Electronics

You want B.Tech Electronics Digital Electronics Notes so here I am sharing it with you:

Digital and Analog Signals
Signals carry information and are defined as any physical quantity that varies with time, space, or any other independent variable. For example, a sine wave whose amplitude varies with respect to time or the motion of a particle with respect to space can be considered as signals. A system can be defined as a physical device that performs an operation on a signal. For example, an amplifier is used to amplify the input signal amplitude. In this case, the amplifier performs some operation(s) on the signal, which has the effect of increasing the amplitude of the desired information-bearing signal.
Signals can be categorized in various ways; for example discrete and continuous time domains. Discrete-time signals are defined only on a discrete set of times. Continuous-time signals are often referred to as continuous signals even when the signal functions are not continuous; an example is a square-wave signal.

Figure 1a: Analog Signal

Figure 1b : Digital Signal
Another category of signals is discrete-valued and continuous-valued or otherwise known as digital and analog signals. Digital signals are discrete-valued and analog signals are continuous electrical signals that vary in time as shown in Figure 1 (a) and (b). Analog devices and systems process signals whose voltages or other quantities vary in a continuous manner. They can take on any value across a continuous range of voltage, current, or other metric. The analog signals can have an infinite number of values. Analog systems can be called wave systems. They have a value that changes steadily over time and can have any one of an infinite set of values in a range. Analog signals represent some physical quantity and they can be a model of the real quantity. Most of the time, the variations corresponds to that of the non-electric (original) signal. For example, the telephone transmitter converts the sounds into an electrical voltage signal. The intensity of the voice causes electric current variations. Therefore, the two are analogous hence the name analog. At the receiving end, the signal is reproduced in the same proportion. Hence the electric current is a model and is an electrical

For complete note I am uploading a word file which is free for you.
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