Power Detection and Control For Mobile Handset Applications - Part 2. Power Detection Methods
Power control architectures for mobile handsets can be categorized into two main groups, Direct and Indirect detection. Indirect power detection takes advantage of relationships between DC characteristics and RF output power without the need to directly evaluate the RF output waveform. Using these relationships, simple circuitry and simple process technologies can offer a potentially lower cost and smaller size solution. These indirect detection techniques suffer in performance due to limited visibility to antenna loading conditions. Direct power detection monitors aspects of the RF waveform. This technique often requires an RF coupler, high frequency circuitry and RF process technology driving cost and increased complexity of dynamic range/isolation tradeoffs.
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