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Evaluating an RMS power detector

Posted: 29 Dec 2010 ?? ?Print Version ?Bookmark and Share

Keywords:LMH2110? power detector? RF signals?

The evaluation board is designed to help the evaluation of the LMH2110, which is a 45 dB Logarithmic RMS power detector

particularly suited for accurate power measurement of modulated RF signals that exhibit large peak-to-average ratios,

i.e. large variations of the signal envelope. Such signals are encountered in W-CDMA and LTE cell phones. The RMS measurement topology inherently ensures a modulation insensitive measurement.

The device has an RF frequency range from 50 MHz to 8 GHz. It provides an accurate, temperature and supply insensitive, output voltage that relates linearly to the RF input power in dBm. The LMH2110's excellent conformance to a logarithmicresponse enables an easy integration by using slope and intercept only, reducing calibration effort significantly. The device operates with a single supply from 2.7V to 5V. The LMH2110 has an RF power detection range from -40 dBm to 5 dBm and is ideally suited for use in combination with a directional coupler. Alternatively a resistive divider can be used as well.

View the PDF document for more information.





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