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  • RMS-DC Conversion
    RMS-to-DC conversion is the truest way to measure the energy contained in an AC waveform. RMS to DC conversion is the truest way to measure the energy contained in an AC waveform. Linear Technology's simple, true RMS-to-DC converters use an innovative delta-sigma computational technique that features high linearity and accuracy suitable for a wide variety of AC measurement applications.
    http://www.linear.com/pc/viewCategory.jsp?navId=H0,C1,C1154,C1086
  • True RMS Detector
    „The op amp precision rectifier circuits have greatly eased the problems of AC to DC conversion. It is possible to measure millivolt AC signal with a DC meter with better than 1% accuracy. Inaccuracy due to diode turn-on and nonlinearity is eliminated, and precise rectification of low level signals is obtained.“
    http://www.national.com/an/LB/LB-25.pdf
  • RMS-to-DC Application Guide Second Edition
    • Section I: RMS-DC Conversion - Theory (PDF, 2,714,992 bytes)
    • Section II: RMS-DC Conversion - Basic Design Considerations (PDF, 2,812,395 bytes)
    • Section III: RMS Application Circuits (PDF, 3,556,620 bytes)
    • Appendix A: Testing the Critical Parameters of RMS Converters (PDF, 1,005,351 bytes)
    • Appendix B: Input Buffer Amplifier Requirements (PDF, 785,957 bytes)
    • Appendix C: Computer Programs for Determining Computational Errors, Output Ripple, and 1% Settling Time of RMS Converter (PDF, 385,153 bytes)
    • Appendix D: New Products Appendix to the RMS-to-DC Conversion Application Guide (October 2002) (PDF, 148,463 bytes)
    • Download the entire guide in .zip format (zip, 10,729,716 bytes)

    ftp://ftp.analog.com/pub/www/library/applicationGuides/amplifiersLinear/downloads/RMStoDC_AppGuide_2ndEd.zip
  • ADL5501 50 MHz to 6 GHz TruPwr Detector
    The ADL5501 is a mean-responding power detector for use in high frequency receiver and transmitter signal chains from 50 MHz to 6 GHz. It is easy to apply, requiring only a single supply between 2.7 V and 5.5 V and a power supply decoupling capacitor. The ADL5501 operates from −40°C to +85°C and is available in a small 6-lead SC-70 package. It is fabricated on a proprietary high fT silicon bipolar process.

    Applications

    • Measurement of CDMA-, CDMA2000-, W-CDMA-, and QPSK-/ QAM-based OFDM, and other complex modulation waveforms
    • RF receiver or transmitter power measurement

    http://www.analog.com/en/prod/0,,770_852_ADL5501%2C00.html
  • Improving Temperature, Stability, and Linearity of High Dynamic Range RMS RF Power Detectors
    Root-mean-square (RMS) power detection is required to measure and control transmitted power in a multicarrier wireless infrastructure. Traditional power detectors using diode detection or log amps do not accurately measure power when the peak-to-average ratio of the transmitted signal is not fixed. Temperature stability of measurement circuitry is critical as is the linearity of the detector’s transfer function. This document presents techniques to improve the temperature stability of an RMS power detector and the linearity of its transfer function to less than ±0.3 dB over a dynamic range of more than 50 dB.
    http://www.analog.com/UploadedFiles/Application_Notes/467439216AN653_a.pdf

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