Welcome to the Amplifiers!


In electronics, an amplifier is an electronic device or circuit which is used to increase the magnitude of the signal (a time-varying voltage or current) applied to its input. When you get to know amplifiers and work with them, you may wonder what exactly is the amplifier? How does it works? 

It is a two-port electronic circuit that uses electric power from a power supply to increase the amplitude of a signal applied to its input terminals, producing a proportionally greater amplitude signal at its output. Amplifiers have many properties include analog-to-digital conversion, common-mode voltage, negative feedback, single supply, frequency compensation, input offset voltage, open-loop, closed loop, finite gain, bandwidth, efficiency, temperature effects and so on. These amplifier properties can be important to take consideration depending on the applications.


Whenever you are working on circuits containing amplifiers, they belong to discrete (built from individual transistors or tubes/valves), IC (fabricated in an Integrated circuit) — most common, and hybrid type depending on their constructions, such as operational amplifier, differential amplifier, power amplifier, distributed amplifiers, switched mode amplifiers, negative resistance amplifiers etc.

In addition, all amplifiers include some form of active device: this is the device that does the actual amplification. The active device can be a vacuum tube, discrete solid state component, such as a single transistor, or part of an integrated circuit, as in an op-amp).

There are a lot of different amplifier types, all with their own applications, characteristics and construction. This page lists the different amplifier types which are described on the amplifier guide.


Amplifiers can be used in a host of different circuits and applications. No one class of operation is “better” or “worse” than any other class with the type of operation being determined by the use of the amplifying circuit. There are typical maximum conversion efficiencies for the various types or class of amplifier.

For example, Op Amps in different circuits where their attributes of high gain, high input impedance, low output impedance, and a differential input enable them to provide high performance circuits, which depend on their unique features based on differnet types.

Circuit Design

The process of circuit design can cover systems ranging from complex electronic systems all the way down to the individual amplifiers within an integrated circuit.

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