How to Master Class 12th Physics like A Topper
The majority of the students find physics a challenging subject, while some find it the most fascinating one. It is due to the conceptual...
Amplitude Modulation
Amplitude Modulation
In amplitude modulation, the amplitude of the carrier is varied in accordance with the information signal.
AM can be represented by expression
Let c(t) =...
Modulation and its Necessity
Modulation is the process of variation of some characteristics of a carrier wave in accordance with the instantaneous value of a modulating signal.
Types of...
Propagation of Electromagnetic Waves
Propagation of electromagnetic waves
Ground (surface) wave propagation:
Ground or surface waves are the radio waves which travel along the surface of the earth as shown...
Bandwidth of Signals
The bandwidth of a signal is defined as the difference between the upper and lower frequencies of signal. In a communication system, the message...
Elements of Communication System
Each and every communication system has 3 essential elements and they are
Transmitter
Communication Channel
...
Logic Gates
Logic gates
A gate is a digital circuit that follows curtain logical relationship between the input and output voltages. Therefore, they are generally known as...
Analog signal and Digital signals
Digital Electronics involves circuits and systems in which there are only two possible states which are represented by voltage levels. Other circuit conditions such...
Transistor as an Amplifier
Transistor as an Amplifier
Amplification is the process of linearly increasing the amplitude of an electrical signal. A transistor can act as an amplifier directly...
Transistor Action or Working of Transistor
A brief description of the three segments of a transistor is given below:
Emitter: This is the segment on one side...