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 is an amplifier? How amplifiers work? 

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.

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


Amplifiers can be used in a host of different circuits and applications. For example, as for operational amplifier applications, some of the more common applications are: as a voltage follower, selective inversion circuit, a current-to-voltage converter, active rectifier, integrator, a whole wide variety of filters, and a voltage comparator.

Circuit Design

The page can cover systems ranging from complex electronic systems all the way down to the individual amplifiers within an integrated circuit. Amplifiers are one of the main building blocks within electronic circuits, especially analogue circuits, where they provide an increase in the signal level. Check op amp circuits here.

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