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Using LMH2120 evaluation board

Posted: 20 Dec 2010     Print Version  Bookmark and Share

Keywords:RF signals  linear RMS power detector  measurement topology 

The LMH2120 is a 40 dB linear 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 WCDMA 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 6GHz. It provides an accurate temperature- and supply- insensitive output voltage that relates linearly to the RF input power. The LMH2120's conformance to a linear response enables an integration by using slope and intercept only, reducing calibration effort significantly. The device operates with a single supply from 2.7V to 5V. The LMH2120 has an RF power detection range from -35 dBm to 5dBm and is ideally suited for use in combination with a directional coupler. Alternatively, a resistive divider can be used.

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