An amplifier is an electronic device which is used to increase the signal of a current, voltage and power without changing other parameters of the waveform such as shape or frequency. It is one of the most commonly used circuits in electronics. Amplifiers can be categorised in different ways. The first way being the frequency of the electronic signal being increased, the second one is the audio frequency amplifier which amplifies a signal from 20 Hz up to 20 kHz. The next is the radio frequency amplifier which amplifies radio frequencies ranging from 20 kHz to 300 kHz and lastly, the current quality and voltage which are being amplified. There are different types of amplifiers; these include current amplifiers, voltage amplifiers, transconductance amplifiers and trans-resistance amplifiers.

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