RMS_TO_DC

Published:2009/7/7 4:51:00 Author:May | From:SeekIC

Single AD534 analog multiplier and two opamps compute RMS value of input signal as square root of sum of squares. Input is first squared at X2 and Y1 then time-averaged by integrator. Closing output loop back to X1 and Y2 completes square-rooting function. Crest factors up to 10 do not appreciably affect accuracy as long as input limits of multiplier are not exceeded. Accuracy is maintained up to 100 kHz. Article gives calibration procedure.-R. Frantz, Analog Multipliers-New IC Versions Manipulate Real-World Phenomena with Ease, EDN Magazine, Sept. 5, 1977, p 125-129.



Reprinted Url Of This Article:
http://www.seekic.com/circuit_diagram/Basic_Circuit/RMS_TO_DC.html

Print this Page | Comments | Reading(3)