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Instrumentation circuitry using RMS-to-DC converters

Posted: 19 Jun 2007 ?? ?Print Version ?Bookmark and Share

Keywords:RMS conversion? RMS-to-DC converters? differential rail-to-rail I/O?

It is widely acknowledged that RMS measurement of waveforms furnishes the most accurate amplitude information. Rectify-and-average schemes, usually calibrated to a sine wave, are only accurate for one waveshape. Departures from this waveshape result in pronounced errors. Although accurate, RMS conversion often entails limited bandwidth, restricted range, complexity and difficult to characterize dynamic and static errors. Recent developments address these issues while simultaneously improving accuracy.

Low frequency accuracy, including linearity and gain error, is inside 0.5 percent with 1 percent error at bandwidths extending to 500kHz. These converters employ a sigma-delta based computational scheme to achieve their performance.

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