Introduction of the chapter
An operational amplifier (opamp)is a versatile device which can be used to amplify AC as well as DC signals. It is manufactured in the form of integrated circuit package. It can perform different mathematical operations like addition, subtraction, integration,taking the derivative, comparison, etc. Hence it is known as operational amplifier. The most important section of opamp is the differential amplifier.It is a circuit of two transistors which has very high gain and it rejects noise to produce high quality (Hi-Fi) output with amplification.
Amplifier is a device or circuit, which increases strength of input signal in terms of either voltage or current. The process of increasing strength is called amplification. It works on external battery supply, takes up power from it, and then amplifies input signal. However, in general circuits of amplifier, external battery supply is not shown and it is understood that it is there!
There are two types of amplifiers: inverting amplifier and non-inverting amplifier. In inverting amplifier, input and output signals are out-of-phase. In non-inverting amplifier, they are in-phase.
The most important factor of amplifier is its gain. The gain of an amplifier is the ratio of output voltage to input voltage. It is denoted by Av. It is always greater than one.
Amplifier is used in all types of electronic instruments like CRO, function generator, voltage regulators, tape recorder, VCR, VCD player, MP3 player, TV, computers and number of others.
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