资料介绍
PA的设计资料CHAPTER 2
POWER AMPLIFIER
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. Therefore knowing the importance degree of each one of these characteristics is an essential step in designing an Amplifier. This can be jugged based on the application. As an example high output power Amplifier is used in the transmitter side of a transceiver, whereas high linear amplifier used in the receiver side.
An amplifier is said to be linear if it preserves the details of the signal waveform, that is to say,
Vo ( t ) = A Vi ( t )
(2.1)
where, Vi and Vo are the input and output signals respectively
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