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Power detector offers repeatable, accurate RMS output

Posted: 19 Feb 2010 ?? ?Print Version ?Bookmark and Share

Keywords:power detector? RMS output? W-CDMA?

MAX2203 RMS power detector

Maxim Integrated Products has released the MAX2203 RMS power detector designed to operate from 800MHz to 2GHz and accepts RF signal at the input, and outputs the same voltage regardless of the peak average of the input signal.

The device is suitable for W-CDMA, CDMA2000 and HSDPA/HSUPA. Using Maxim's expertise with the SiGe BiCMOS process and wafer-level packaging technology, the MAX2203 offers a repeatable and exceptionally accurate RMS output over temperature and modulation. This "future-proof" performance means that the MAX2203 is modulation independent. A circuit can now be reused with no additional engineering effort in new end-equipment designs that add modulation schemes.

The output voltage and input power is linear in dB. The device has a -25dBm to +3dBm detection range, and every dB change in input power gives 40mV typical change in output voltage. Boasting 0.1dB typical RMS accuracy from W-CDMA modulation change and 0.5dB detection error due to temperature, the MAX2203 improves closed-loop performance of the transmit path in today's multiband, multimode smart phones, cellular phones, broadband laptop data cards. It can also be used for SAR limiting.

The MAX2203EWT+T operates from a 2.5V to 4.2V supply. Fully specified over the -40C to +85C extended temperature range, it is available in an ultrasmall, 6-pin WLP. Prices start at $0.50 (1,000-up, FOB USA).

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