Combination Closed Loop and Vcc Power Control for a GSM/GPRS PA
High Frequency Electronics, Xindium Technologies, Maxim Integrated Products
Paul McCambridge and Brian Whitaker
Power control is an important perfor-mance specifica-tion for GSM/GPRS wire-less handsets. This article shows how the MAX4002 low-cost, low-power loga-rithmic amplifier and power detector, and the XIN9133 quad-band GSM/GPRS power amplifier (PA) are com-bined 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’s predominant GSM power control solutions on the market.
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