High-Accuracy Logarithmic RMS Power Detector Reference Design for WLAN Applications


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Key Document


Dynamic transmit-power control is critical for improving spectral efficiency and reducing adjacent channel interference in wireless local area networks (WLANs). In addition, regulatory agencies worldwide require that transmit power be limited to certain level to reduce interference with other communication equipment. Another benefit of transmit power control in WLAN systems is to prolong battery life by reducing power-supply voltage to the power amplifier. This TI design provides a solution for closed-loop dynamic transmit power control for WLAN application. Although this particular design implements WLAN transmit power control, similar concepts can be used to implement power control schemes for other wireless technologies, such as LTE.

Applications for transmit power control span a very wide range: from mobile handheld devices to industrial to automotive applications. For example, LMH2110 can be employed in automotive electronics to satisfy transmit power control needs of LTE or WiFi communication systems.

  • High-accuracy logarithmic RMS power detection for WLAN transmit chain at 5 GHz to 6 GHz
  • 45-dB linear-in-dB power detection range
  • LOG conformance better than ±0.5 dB
  • Highly temperature insensitive (±0.25 db over operating temperature range)
  • Modulation independent response

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Design Guide

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Design Files

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Bill of Materials (BOM)

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TI Devices (2)

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Part Number Name Product Family Sample & Buy Design Kits & Evaluation Modules
LMH2110  8 GHz Logarithmic RMS Power Detector With 45 dB Dynamic Range  Mixers & modulators  Not Available View Design Kits & Evaluation Modules
LP5912  500mA Low-Noise Low-Iq LDO  Power management  Sample & Buy View Design Kits & Evaluation Modules

CAD/CAE symbols

Part # Package | Pins CAD File (.bxl) STEP Model (.stp)
LMH2110 Download -
LP5912 Download Download

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Technical Documents

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User guides (1)
Title Abstract Type Size (KB) Date Views TI Recommends
PDF 1224 10 Dec 2015 12
Design files (4)
Title Abstract Type Size (KB) Date Views
ZIP 2165 10 Feb 2016 11
PDF 932 10 Feb 2016 3
PDF 96 10 Feb 2016 3
PDF 273 10 Feb 2016 6

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