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Power detection for rf and analog applications

Analog Devices has introduced two rf detector products for RF and analog engineers who need to improve power detection performance. The first is the ADL5502, a crest-factor rf power detection ic that combines an rms (root mean square) RF detector and an envelope detector. The second is the ADL5513, a log amp with wide dynamic range (80 dB with 3 dB log conformance up to 4 GHz), designed to help RF engineers accurately detect and control output power up to WiMAX and LTE frequency bands.

The ADL5502 is said by ADI to be the industry's first dual-function RF detector in a single package that combines an RMS detector with an envelope detector. A combination of accurate power measurement and crest-factor calculation allows cell-phone power amplifier performance to be optimised in mobile phone designs. ADI claims a 0.1 dB accuracy for the RF detector and says that the higher level of integration means that cell phone users can expect up to 20 percent longer battery life.

Meanwhile, the ADL5513 has been designed for any Tx/Rx application requiring measurement or control of an RF/IF power level. The device is said to hold its dynamic range over its entire 4-GHz frequency range, making it suitable for designers needing to measure and control a wide power level range in communication systems that operate across a broad frequency spectrum. The ADL5513 drifts less than 0.5 dB over temperature, simplifying system calibration routines by enabling designers to use only a room-temperature calibration, and the device operates to 125 degrees C.

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