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RMS power detector measures signals with varying crest factors

Posted: 15 Feb 2008 ?? ?Print Version ?Bookmark and Share

Keywords:RMS power detector? WiMAX? power amplifier?

Analog Devices Inc. has introduced the AD8363 TruPwr root-mean-square (RMS) power detector that precisely measures signals with highly varying crest factors up to 6GHz used in WiMAX/802.16, W-CDMA, TD-SCDMA and LTE applications.

The AD8363 supports the communications industry's focus on increasing efficiency and improving ease-of-use to reduce the overall system size and cost. The AD8363 targets high-performance RF applications including power amplifier linearization/control loops, transmitter power control, transmitter signal strength indication (TSSI) and RF instrumentation. Accurate control of PA output power significantly reduces cost and improves efficiency. TruPwr ICs are ADI's portfolio of patented RMS detectors. ADI offers one of the most extensive RMS portfolios in the market.

The AD8363 is suited for next-generation RF applications using complex signals with highly varying peak-to-average ratios. The signal is sent directly into the single-ended input eliminating the need for an external balun, unlike power detectors from previous generations. The AD8363 achieves 0.5dB accuracy over the entire 50dB +1dB dynamic range. The output is linear-in-dB, and scaled to 50mV/dB, but other slopes can be arranged. The AD8363 is fully specified and stable over the entire frequency range of 50Hz to 6GHz, operating temperature range of -40C to 125C and supply voltage range of 4.5-5.5V. With these specifications, the most stringent power measurement applications can be accurately realized.

The AD8363 is currently sampling and will be available in production quantities in April. The device is packaged in a compact 16-lead 4mm x 4mm LFCSP with a price of $5.25 each in 1,000-piece quantities.

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