RMS detector accurately measures large crest factor signals in 3G and 4G devices

BANGALORE, INDIA: Analog Devices Inc. (ADI) is introducing a TruPwr RF power detector 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.

Furthermore, with industry-leading specifications and the smallest footprint at a mere .8 mm x .8 mm, 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.

ADL5505 key features and benefits
* Excellent temperature stability across a 30 dB range and near 0 dB measurement error across temperature over the top portion of the dynamic range.
* Effective in high-frequency receiver and transmitter signal chains from 450 MHz to 6000 MHz.
* Requires only a single supply between 2.5 V and 3.3 V, the detector draws less than 1.8 mA.
* RMS output is a linear-responding dc voltage with a conversion gain of 1.86 V/V RMS at 900 MHz.
* On-chip modulation filter provides sufficient averaging for most waveforms.

The ADL5505 is available now in a 0.8 mm x 0.8 mm WLCSP package and is priced at $2.50 per unit in 1,000-unit quantities.

In addition to the RMS power detectors, ADI has a wide range of products used within mobile terminals, including MEMs accelerometers, audio amplifiers, HDMI interfaces, lens driver components, power management and audio switches.