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13-11-2012, 10:51 AM
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.pptx  POWER AMPLIFIER.pptx (Size: 509.64 KB / Downloads: 22)


An amplifier receives a signal from some pick up transducer or other input source and provides a large version of the signal to some output devices or to another amplifier stages .


In small-signal amplifiers the main factors are:
Since large-signal, or power amplifiers handle relatively large voltage signals and current levels, the main factors are:
Maximum power capability
Impedance matching to the output device

Amplifier Types

Class A

The amplifier conducts through the full 360 of the input. The
Q-point is set near the middle of the load line.

Class B

The amplifier conducts through 180 of the input. The Q-point is set at the cutoff point.

Class AB

This is a compromise between the class A and B amplifiers.
The amplifier conducts somewhere between 180 and 360
The Q-point is located between the mid-point and cut off.


We have gone through various term related to the Power Amplifier. The basic function of the Power Amplifier is similar to that of the amplifier. There are modification of Class A, Class B, Class AB, Class C and Class D Amplifier that increase power Efficiency. Output stages are classified according to the transistor conduction angle .
The lower the amount of conduction angle of the amplifier the higher the efficiency.
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