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An amplifier is an electronic device that increases the voltage, current, or power of a signal. Amplifiers are used in wireless communications and broadcasting, and in audio equipment of all kinds.  Or Amplifier is device which increase the strength of signal. An amplifier, electronic amplifier or (informally) amp is an electronic device that can increase the power of a signal. An amplifier functions by taking power from a power supply and controlling the output to match the input signal shape but with a larger amplitude. In this sense, an amplifier modulates the output of the power supply based upon the properties of the input signal. An amplifier is effectively the opposite of an attenuator: while an amplifier provides gain, an attenuator provides loss. Amplifier is made up of transistors. before invention of the transistor vacuum tubes were used in amplifier. Classification of Amplifiers 1-Type of Signal ...

Radio frequency engineers  are specialists within the electrical  engineering  field. They work with devices that transmit or receive  radio waves , including wireless  equipment, radios, and cellular phones. A background in general electronics, physics, and math is needed to design and improve  wireless  networks. In a descriptive form Radio‐frequency (RF) engineering is about systems that operate at radio frequencies such as microwave frequencies. This chapter begins with a look at the RF subsystem of a typical radio. This gives us a good view of how amplifiers, filters, mixers, and so on, may be organized in a typical RF subsystem. The chapter then elaborates on the “handle with care” aspects of RF and how it differs from low‐frequency circuits. It introduces some mathematical preliminaries, such as how we model RF subsystems and how we perform analysis on nonlinear effects. The chapter then tackles the problem of noise. Besides noise, i...

Electronics engineering, or electronic engineering, is an electrical engineering discipline which utilizes non-linear and active electrical components (such as semiconductor devices, especially transistors, diodes and integrated circuits) to design electronic circuits, devices, microprocessors, micro controllers and other systems.  It also deals with the design and application of circuitry and equipment for power generation and distribution, machine control, and communications.   In other worlds we say that electronics engineering is an area which purely describes the study and areas of electricity, electronics and electromagnetism. Due to many amendments taken place in the field of electronics, electronics engineering has been divided into many sub categories including digital computers, power engineering, telecommunications, control system, radio frequency engineering, signal processing, microelectronics and instrumentation.Electronics engineering homework help p...