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Power detector delivers accurate RMS for 4G terminals

Posted: 18 Jun 2010 ?? ?Print Version ?Bookmark and Share

Keywords:power detector? RF waveform? 4G? W-CDMA?

Analog Devices Inc. is rolling out the TruPwr RF power detector designed for 3G and 4G mobile terminals.

The ADL5505 TruPwr RF power detector is a highly accurate, easy-to-use device for determining the RMS (root mean square) power of complex waveforms. It can be used for power measurements of both simple and complex waveforms and is particularly useful for measuring high crest factor (high peak-to-RMS ratio) signals, such as W-CDMA, CDMA2000, WiMAX, WLAN and LTE waveforms. It is also effective for optimizing the performance of linear power amplifiers.

The ADL5505 power detector eliminates the need for look-up tables and correction factors for large and changing crest factors, significantly increasing efficiency, battery life and signal quality while reducing bill of materials cost. It offers what the company claims is the smallest footprint at a mere .8mm x .8mm.

The ADL5505 provides temperature stability across a 30dB range and near 0dB measurement error across temperature over the top portion of the dynamic range. It is effective in high-frequency receiver and transmitter signal chains from 450MHz to 6000MHz. The ADL5505 requires only a single supply between 2.5V and 3.3V, and the detector draws less than 1.8mA.

RMS output is a linear-responding dc voltage with a conversion gain of 1.86V/V RMS at 900MHz. On-chip modulation filter provides sufficient averaging for most waveforms.

The ADL5505 is priced at $2.50 in 1,000 units.

- Ismini Scouras

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