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Squelch Circuit

Squelch Circuit: Squelch (muting): When no carrier is present at the input, i.e., in the absence of transmissions on a given channel or between stations, a sensitive receiver will produce a…

Working Principle of Automatic Gain Control

Working Principle of Automatic Gain Control: Working Principle of Automatic Gain Control is a system by means of which the overall gain of a radio receiver is varied automatically with…

Frequency Changing and Tracking in Receivers

Frequency Changing and Tracking in Receivers: The mixer is a nonlinear device having two sets of input terminals and one set of output terminals. The signal from the antenna or…

Generation of Amplitude Modulation

Generation of Amplitude Modulation: There are two types of devices in which it may be necessary to the Generation of Amplitude Modulation. The first of these, the AM transmitter, generates…

Internal Noise in Communication System

Internal Noise in Communication System: Under the heading of Internal Noise in Communication System, we discuss noise created by any of the active or passive devices found in receivers. Such…

Level Detector

Level Detector: Schmitt trigger or level detector circuits are very often employed in static relay circuits as a final stage before the trip coil circuit of the circuit breaker. The…

Electronic Devices and Circuits Articles

Electronic Devices and Circuits Articles: This Electronic Devices and Circuits Articles which includes the following topics: Introduction to Semiconductor Materials and Devices Conduction in Solids Conductor Semiconductor and Insulator P…

Pulse Width Modulation

Pulse Width Modulation(PWM): Pulse width modulation of PTM is also often called Pulse Duration Modulation (PDM). In this system, shown in Fig. 18.8, we have a fixed amplitude and starting…