Dual-channel rms power detector accurately measures RF signals in cellular base stations

Norwood, MA—Analog Devices Inc. introduced the AD8364 dual-channel radio frequency (RF) root-mean-square (rms) power detector for precision measurement of transmit and receive signals up to 2.7 GHz. Analog Devices reports that the AD8364 is the industry's only power detector that measures two complex input signals simultaneously, enabling cellular base station system designers to solve one of their biggest challenges—the accurate measurement of RF signals.

The AD8364 is well suited for use in next-generation cellular infrastructure equipment using complex signals with constantly varying peak-to-average ratios, such as CDMA2000, W-CDMA, and TD-SCDMA. Specific applications include PA (power amplifier) control and linearization, antenna VSWR (voltage standing wave ratio) monitoring, transmitter power control, and automatic gain control circuits. Better control over the power and gain within a base station power amplifier allows designers to significantly reduce cost and improve operating efficiency.

The AD8364 is the newest member of Analog Devices' TruPwr family of detectors, which are designed to measure complex waveforms at RF frequencies and deliver an accurately scaled DC voltage that is the rms equivalent of the input waveform. Additional enhancements include improved temperature performance and reduced log-conformance ripple within the detector cores. With two matched detectors, the precise matching of both channels reduces temperature- and part-to-part variations in comparison to discrete designs.

The AD8364 provides two accurately scaled independent outputs for each RF measurement, a difference output measured across the two channel inputs, and a temperature output measured by the on-chip temperature sensors.

The AD8364 operates on a single +5VDC supply, is fully specified for operation from -40 to +85 degrees C and is packaged in a 5 mm x 5 mm LFCSP (lead frame chip-scale package). It is currently available in pre-production quantities, with volume production scheduled for March 2005. The device is priced at $7.85 per unit in 1,000-piece quantities.

For more information:
AD8364 Data Sheet

Analog Devices, Inc. +1-800-262-5643

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