所设计的射频2W线性功率放大器是基于负载线匹配原理，采用功率回退法技术。

The 2W linear RF Power Amplifier in this paper is designed in Feedback method, based on Loadline Theory.

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同时，软件无线电为射频功率放大器的设计提供了新的技术途径。

At the same time, SDR provides new techniques and methods for the design of power amplifiers.

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射频功率放大器总是工作在大信号状态下，它所用的放大器件和电路设计方法都不同于小信号放大器，导致了功率放大器的设计难度较大。

RF PA almost working in large signal, so it's circuit design methods and transistor used are different from microwave small signal amplifier, these will led to RF PA design become more difficulty.

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