By Paul McCambridge, Xindium Technologies, andBrian Whitaker, Maxim Integrated Products
射频前端产业观察：
如果有人在讨论GSM PA的功率控制方式的话，那么这个人要么15年以前是RF工程师， 要么现在是一个难得的射频人才。
非直接电流检测，非直接电压检测，功率闭环检测，不同的实现方式，引起很多的讨论。
这里共享一篇“考古”的文章。
Power control is an important performance specification for GSM/GPRS wireless handsets. This article shows how the MAX4002 low-cost, low-power logarithmic amplifier and power detector, and the XIN9133 quad-bandGSM/GPRS power amplifier (PA) are combined in a closed loop power control system with the added advantage of PA protection through supply voltage power control. This results in significant advantages over today’spredominant GSM power control solutions on the market.
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