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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.
- Classification of Power Amplifiers
Classification of Power Amplifiers - The Power amplifiers...
- Class Ab and C Power Amplifiers
Class C Power Amplifier. When the collector current flows...
- Class a Power Amplifiers
A Class A power amplifier is one in which the output current...
- 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.
A Class A power amplifier is one in which the output current flows for the entire cycle of the AC input supply. Hence the complete signal present at the input is amplified at the output. The following figure shows the circuit diagram for Class A Power amplifier.
Radio frequency amplifiers used in transmitters can be required to produce thousands of kilowatts of output power, and DC amplifiers used in electronic control systems may also need high power outputs to drive motors or actuators of many different types.
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.
C I CQ 0ππ2 3 π4 ω t i C ππ2 3π4πω t i C I CQ 0 ππ234ππω t i 0 ππ2 3π4πω t (a) (b) (c) (d) ˚˜ , ˝ &˙˛ 0 8 $˙ˆ˛ 8 $˙ ˛ 0 8 $ ˙ ˛ 8 i C R L vI v O + – V CC CE i C V CEQ V CC v CE I CQ 2I CQ Q-point dc load line Time Time 0 0 T T P Q 0 T Time 2 T V CC I CQ 2 (a) (b) (c) ˚˜ . ˙˛ 8 $˙ˆ˛ $ ˙ ˛ ˝ " + #
Utilize these free study guide on power amplifiers and learn basic electronics. Covers the basics and some advanced concepts around power amplifiers.