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Using LMH2110 evaluation board

Posted: 28 Aug 2014  Print Version  Bookmark and Share

Keywords:evaluation board  RMS power detector  W-CDMA  LTE  LMH2110 

The evaluation board is designed to help the evaluation of the Texas Instruments 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, that is, 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 50MHz to 8GHz. It provides an accurate, temperature and supply insensitive, output voltage that relates linearly to the RF input power in dBm. The LMH2110's conformance to a logarithmic response 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.

The device is active for EN = High, otherwise it is in a low power consumption shutdown mode. To save power and prevent discharge of an external filter capacitance, the output (OUT) is high-impedance during shutdown.

View the PDF document for more information.

Originally published by Texas Instruments Inc. at www.ti.com as "LMH2110 Evaluation Board".





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