What Is An Amplifier?

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

a. Small Signal

i. voltage amplifier

b. Large Signal

i. current amplifier

ii. power amplifier

2. Type of Configuration

a. Common Emitter

b. Common Base

c. Common Collector

3. Classification

a. Class A Amplifier

b. Class B Amplifier

c. Class C Amplifier

d. Class AB Amplifier

4. Frequency of Operation

a. Direct Current (DC)

b. Audio Frequencies (AF)

c. Radio Frequencies (RF)

d. VHF, UHF and SHF Frequencies

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