RF power measurement devices improve battery life in mobile handsets - Embedded.com

RF power measurement devices improve battery life in mobile handsets


Designed to improve the battery life in mobile handsets, the ADL5500 power detector and AD8311 power controller reduce system size while offering high accuracy and temperature stability. The end result is a reduction in wasted power. The parts, developed by Analog Devices, are housed in 0.6-mm-thick packages.

The ADL5500 RMS power detector is optimized for CDMA, CDMA2000 (including 1xEV-DO), TD-SCDMA, and W-CDMA handsets, as well as for terminal devices for 802.16, WiMAX, and wireless systems with high-crest-factor waveforms. The part is the latest member of ADI's TruPwr family of detectors, which are optimized to measure complex waveforms at RF frequencies and deliver an accurately scaled dc voltage that is the true RMS equivalent of the input waveform. Further space reduction comes from the integration of an ac coupling capacitor, a 50-ohm matching resistor, and a filter capacitor. It requires a single supply between 2.7 and 5.5 V and consumes just 3.3 mW at 3 V.

The AD8311 power controller is designed for GSM/GPRS cellular handsets. It resides in a 1- by 1.5-mm package. It's a logarithmic power controller that provides precise control of RF power amplifiers operating in the frequency range of 100 MHz to 2.5 GHz and over a typical 45-dB dynamic range. The high sensitivity of the AD8311 allows measurement at low power levels, thereby reducing the amount of power being coupled to the detector. The device consumes 8.5 mA from a 2.7- to 5.5-V supply.

The ADL5500 is sampling now, with production quantities scheduled for July, and is priced at $0.90 in 10,000-piece quantities. The AD8311 is available now and costs $1.20 per unit in similar quantities. For more information, visit www.analog.com/ADL5500 and www.analog.com/AD8311.

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