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True RMS Detector - Texas Instruments
https://www.ti.com/lit/an/snoa855/snoa855.pdf
True RMS Detector Introduction 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.
AN012 - Peak, RMS and averaging circuits
https://sound-au.com/appnotes/an012.htm
As with a peak measurement, the RMS value for a sinewave is obtained simply by scaling the rectified voltage, and in this case a meter would be adjusted to read 707mV with an input of 637mV. The average value of a sinewave is determined by ... 2 × V (peak) / π = 0.6366 (0.637) for a 1V peak sinewave (707mV RMS)
Build an Audio Detector - Projects - All About Circuits
https://www.allaboutcircuits.com/projects/build-an-audio-detector/
The following code adds WiFi capability to the audio detector. Download the following zip file and unpack to a directory. Open the sketch in Energia. File>Open>audio_RMS_print.ino. Make sure to select the correct board in Tools>Board>Launchpad w/ CC3200 80MHz. Modify the network constants below.
VERSATILE AUDIO AGC CIRCUIT - EYRG.net
http://www.g8ajn.eyrg.net/mediafire/AGC2014ArticleFull.pdf
LEVEL DETECTOR. The SSM2166 incorporates a full-wave rectifier and a patent pending true rms level detector circuit whose averaging time constant is set by an external capacitor C12 connected to pin 8. For optimal low frequency operation of the level detector down to 10 Hz, the value of the capacitor should be 2.2 µF.
THAT Corporation 2252 RMS-Level Detector ICs
http://thatcorp.com/2252_RMS-Level_Detector_IC.shtml
The THAT 2252 integrated-circuit rms level detector is designed to convert an AC input current into a DC output voltage. The output is proportional to the log of the true rms value of the input signal. Fabricated in a super low-noise process, the 2252 combines wide dynamic range with frequency response to beyond 20 kHz. The logarithmic output is especially convenient for …
RMS Detectors | Analog Devices
https://www.analog.com/en/products/amplifiers/rf-power-detectors/rms-responding-power-detectors.html
TruPwr™ RMS detectors provide high accuracy, waveform agnostic power measurements. As modern communication systems use a variety of complex waveform adaptive modulation techniques, such as OFDM, CDMA, QAM, the ability to provide accurate power measurements irrespective of the waveform significantly reduces the required amount of system calibrations
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