一篇关于doherty的文章: EFFICIENCY ENHANCEMENT OF BASE STATION POWER AMPLIFIERS USING DOHERTY TECHNIQUE.pdf

本帖最后由 gqlinshi 于 2009-9-7 12:48 编辑

�������ص�����

推荐一篇关于doherty的基础文章，有兴趣的可以看看
By Vani Viswanathan

ABSTRACT

The power amplifiers are typically the most power-consuming block in wireless communication systems. Spectrum is expensive, and newer technologies demand transmission of maximum amount of data with minimum spectrum usage. This requires sophisticated modulation techniques, leading to wide, dynamic signals that require linear amplification. Although linear amplification is achievable, it always comes at the expense of efficiency. Most of the modern wireless applications such as WCDMA use non-constant envelope modulation techniques with a high peak to average ratio. Linearity being a critical issue, power amplifiers implemented in such applications are forced to operate at a backed off region from saturation. Therefore, in order to overcome the battery lifetime limitation, a design of a high efficiency power amplifier that can maintain the efficiency for a wider range of radio frequency input signal is the obvious solution.
A new technique that improves the drain efficiency of a linear power amplifier such as Class A or AB, for a wider range of output power, has been investigated in this research. The Doherty technique consists of two amplifiers in parallel; in such a way that the combination enhances the power added efficiency of the main amplifier at 6dB back off from the maximum output power.
The classes of operation of power amplifier (A, AB,B, C etc), and the design techniques are presented. Design of a 2.14 GHz Doherty power amplifier has been provided in chapter 4. This technique shows a 15% increase in power added efficiency at 6 dB back off from the compression point. This PA can be implemented in WCDMA base station transmitter.

不错！看看了，谢谢楼主

不错！看看了，谢谢楼主

看看 研究下啊

:31bb

下班前自己up一下，哈哈

这个事硕士学位论文吧

感谢楼主分享

基本思路很清晰，实现的水平有些粗浅。
初学者可以看看。

Good paper on Doherty mechanism

好东西《《《《《

好东东，好好学习

啊 英文！:19bb

好东东，先看看。

好东西,值得一看.顶一下!

顶起，虽然有点老

这篇文章不错哈，我就看看啦，谢谢

谢谢了啊！

学习一下，谢谢！！

谢谢楼主啦~~~~~

感谢分享

用得着啊

doherty的内容已经很多了，不知道这篇有什么独到之处

上世纪，40年代的发明

现在正在做doherty pA，找点这方面的资料，谢谢分享

看看，谢谢

谢谢~

0.0 see see

thank you