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Power Amplifier. The function of a power amplifier is to raise the power level of input signal. It is required to deliver a large amount of power and has to handle large current. The characteristics of a power amplifier are as follows −. The base of transistor is made thicken to handle large currents. The value of β being (β > 100) high.
- Classification of Power Amplifiers
Power amplifiers are divided into two categories, based on...
- Class Ab and C Power Amplifiers
Class C Power Amplifier. When the collector current flows...
- Class a Power Amplifiers
Class A Power Amplifiers - We have already come across the...
- Direct Coupled Amplifier
The input signal when applied at the base of transistor T 1,...
- Classification of Power Amplifiers
Class C Power Amplifier. When the collector current flows for less than half cycle of the input signal, the power amplifier is known as class C power amplifier. The efficiency of class C amplifier is high while linearity is poor. The conduction angle for class C is less than 180 o.
Power amplifiers are divided into two categories, based on the frequencies they handle. They are as follows. Audio Power Amplifiers − The audio power amplifiers raise the power level of signals that have audio frequency range (20 Hz to 20 KHz). They are also known as Small signal power amplifiers.
Section 5.0 Introduction to Power Amplifiers. Understand the Operation of Power Amplifiers. Section 5.1 Power Transistors & Heat Sinks. • Power Transistor Construction. • Power De -rating & High Power Operation. • Thermal Resistance of Heat Sinks. • Thermal Runaway. Section 5.2 Class A Power Amplifiers.
Utilize these free study guide on power amplifiers and learn basic electronics. Covers the basics and some advanced concepts around power amplifiers.
2.0 Introduction. The main characteristics of an amplifier are Linearity, efficiency, output power, and signal gain. In general, there is a trade off between these characteristics. For example, improving amplifier’s linearity will degrade its efficiency.
Objectives. After studying this chapter, you should be able to: Show how the dc load line, ac load. line, and Q point are determined for CE and CC power amplifiers. Calculate the maximum peak-to-peak (MPP) unclipped ac voltage.
