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RF power detector spans incredible 1MHz to 8GHz

Posted: 19 May 2004 ?? ?Print Version ?Bookmark and Share

Keywords:analog devices? rf power detector? ad8318?

Analog Devices, a provider of high-performance semiconductors for signal-processing applications, has unveiled a major breakthrough in RF detection for wireless infrastructure equipment.

The company has developed the industry's first logarithmic RF power detector to accurately measure radio signals from 1MHz to 8GHz. The AD8318 achieves frequencies never before attainable with a monolithic silicon-based detector. Its unique combination of accuracy and dynamic range allows the device to be used across a broad spectrum of wireless communications infrastructure equipment, including cellular basestations, W-LAN 802.11 applications, and military radar.

The new logarithmic-based detector is the next generation of Analog Devices' AD8313, a widely recognized industry standard for RF power measurement up to 2.5GHz. The AD8318 is fabricated on Analog Devices' proprietary XFast3 process, an advanced silicon germanium (SiGe) complementary bipolar process. The proprietary silicon on insulator (SOI) process and advanced design techniques enabled the superior operational accuracy compared to discrete implementations at the higher operating frequencies and integrated lower frequency competitive solutions.

Increased accuracy with temperature stability

Maintaining the detector dynamic range up to 8GHz has never before been possible. The AD8318 provides over 55dB dynamic range with better than &plusm;1dB accuracy up to 5.8GHz. The temperature drift can be fine tuned to the band of interest, yielding better than &plusm;0.5dB stability from -40C to 85C.

The AD8318 integrates an on-chip temperature sensor that provides a 2mV/C output voltage that can be used for additional temperature compensation and/or system monitoring. The part also provides the fastest output response time of 8 ns, enabling the part to be used for RF burst detection.

The AD8318 is designed for cellular infrastructure standards, such as GSM, CDMA and W-CDMA, as well as for RF transmit power control and receiver power measurement and control applications. Because of its wide-band performance attributes, the detector is especially appropriate for fixed wireless access systems and W-LAN 802.11a/g.

The AD8318 is sampling now, and production quantities will be available July 2004. The device is offered in a compact 3-by-3mm, 16-pin LFCSP, and fully specified over the -40C to 85C operating temperature range. The AD8318 is priced at $5.99 in 1,000-piece quantities.

Analog Devices' RF ICs have the high-performance specifications such as speed and dynamic range that enable new, highly desirable architectural changes to radio designs which, in turn, reduce component count, decrease cost, and ease design challenges.

- Paul O'Shea


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