Power Amplifier Basic (Part 1)

Published:2013/3/15 4:13:00 Author:Ecco | Keyword: Power Amplifier | From:SeekIC

My previous post was mostly about schemes amplifier circuit without knowing what it is an power amplifier. In this post will be discussed on the the Power amplifier basic, what is inside and how they work.What is a Power Amplifier – on, for brevity, usually called “PA”. In general, the Power amplifier block diagram is divided into three parts: The input stage Intermediate stage The output stage These three sections do one task – to increase power output to levels that can drive the load with low impedance – the dynamic head or headphones. How do they do? It’s easy – PA requires direct current power supply and converts it to AC, but keep the shape of the output signal follows the shape of the input signal. But, unfortunately, all that is good only in theory. In practice, audio design, we use a non-ideal resistors, capacitors and transistors, in particular. Therefore, the output can be very different form of input seriously, and this problem is called distortion.



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