Wireless Systems Design

RF RMS Power Detector Measures Two Signals Simultaneously

To support the data converters in wireless-infrastructure equipment, Analog Devices has introduced a dual-channel RF root-mean-square (RMS) power detector. This power detector measures transmit and receiver signal levels to 2.7 GHz. Known as the AD8364, the device can measure two complex input signals simultaneously.

This integrated circuit is ideal for measuring the power levels of complex signals with constantly varying peak-to-average power levels, as in cdma2000, W-CDMA, and TD-SCDMA systems. The detector can be used for antenna VSWR monitoring, power-amplifier control and linearization, transmitter power control, and automatic-gain-control (AGC) circuits.

The AD8364 builds on the company's earlier AD8362 RMS single-channel power detector, which was introduced in 2002. The new power detector integrates two matched AD8362 channels with optimized temperature stability and log accuracy on a single chip. Each AD8364 channel can be used to control separate gain and feedback loops. In addition, one channel can be used as a reference with the other channel slaved to a feedback loop.

The power detector achieves a ±0.5-dB temperature-stable linear-in-dB response at operating temperatures from −40° to +85°C. The power detector draws 70 mA current from a +5-VDC supply. The AD8364 is supplied in a 32-lead 5-×-5-mm LFCSP package.

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