What is Amplifier?

An Amplifier or Amp is an electronic device that is built to increase the power and stability of a signal (a time-varying voltage or current).

Amplifiers consists of 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. 

What is Amplification?

Amplification is the method of enhancing the signal strength of any electronic device. 

Almost all electronic equipment have some means of amplifying their own signals. The use of amplifiers can be found almost every where; in medical devices, scientific equipment, automation, military instruments, communication instruments, industries and even in home machineries.

In History, The first practical device that could do the work of amplification was the Triode Vacuum Tube, which was invented in the year 1906 by Lee De Forest, and later led to the first amplifiers in the year 1912. At that time, Vacuum tubes were used in almost all amplifiers up till the 1970s and later replaced by transistors. Today, most amplifiers use transistors, but vacuum tubes still continue to be used in some applications.  

Major Categories of Amplifiers: 

There are 3 major categories of amplifiers: 

1. Voltage Amplifier

2. Current Amplifier

3. Power Amplifier

Types of Amplifiers: 

1. Audio Frequency Amplifiers (A.F. Amplifiers): A.F. Amplifiers are used to supply audio frequency power for the loud speakers. 

2. Intermediate Frequency Amplifiers (I.F. Amplifiers): I.F Amplifiers are used in TVs, radios and radar broadcast. 

3. Radio Frequency Amplifiers (R.F. Amplifiers): R.F Amplifiers are used to drive radio antenna of a transmitter.

4. Ultrasonic Amplifiers: Ultrasonic amplifiers are responsible for ultrasonic waves amplification.

5. Wideband Amplifiers: Wideband amplifiers are used to amplify a band of frequencies. They are used to amplify from DC to several tens of MHz.

6. Direct Coupled Amplifiers (DC Amplifiers): Direct coupled or DC amplifiers are used to further amplify the very low frequency signals. 

7. Video Amplifiers: Video amplifiers are used to improve video signals in order to display it in high quality resolution.

8. Buffer Amplifiers: Buffer amplifiers are used for electrical impedance transformation from one circuit to another.

9. Operational Amplifiers: Operational amplifiers are used to perform mathematical operations on voltages.

10. Transistor Amplifiers: Transistor amplifiers are used to amplify the voltage or current of the input signal.

In the Full course, you will learn everything you need to know about Amplifiers with Diploma Certificate to showcase your knowledge/skill gained.

Amplifiers Course Outline

Amplifiers - Introduction

Amplifiers - Materials

Amplifiers - Transistors Overview

Amplifiers - Transistor Configurations

Amplifiers - Transistor Regions of Operation

Amplifiers - Transistor Load Line Analysis

Amplifiers - Operating Point

Amplifiers - Transistor as an Amplifier

Amplifiers - Transistor Biasing

Amplifiers - Methods of Transistor Biasing

Amplifiers - Bias Compensation

Amplifiers - Basic Amplifier

Amplifiers - Classification of Amplifiers

Amplifiers - Based on Configurations

Amplifiers - Multi-Stage Transistor Amplifier

Amplifiers - RC Coupling Amplifier

Amplifiers - Transformer Coupled Amplifier

Amplifiers - Direct Coupled Amplifier

Amplifiers - Power Amplifiers

Amplifiers - Classification of Power Amplifiers

Amplifiers - Class A Power Amplifiers

Amplifiers - Transformer Coupled Class A Power Amplifier

Amplifiers - Push-Pull Class A Power Amplifier

Amplifiers - Class B Power Amplifier

Amplifiers - Class AB and C Power Amplifiers

Amplifiers - Tuned Amplifiers

Amplifiers - Types of Tuned Amplifiers

Amplifiers - Feedback Amplifiers

Amplifiers - Negative Feedback Amplifiers

Amplifiers - Emitter Follower & Darlington Amplifier

Amplifiers - Noise in Amplifiers

Amplifiers - Exams and Certification


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