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This paper presents the radio frequency power detector design for the bias control of the power amplifiers using a DC to DC converter. Non-diode type power detector has large bandwidth which is important for fast tracking of the non-constant envelope RF signal such as in WCDMA (wideband CDMA) system. The measured result shows the output voltage of power detector from 0.77V at low output power to 1.806V at 27.5dBm output. The variation of the detector output voltage is less than 60mV because of the temperature compensated current sources when the ambient temperature is varied from -30°C to 85°C.

RF power detector design with temperature compensation for power amplifiers bias control