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RMS to DC conversion
2

RMS to DC conversion

RMS to DC conversion

2
(OP)
How to go for RMS to DC conversion.Any reference?
OPAMP oriented circuit will be preferable.

RE: RMS to DC conversion

Check the Analog Devices Site (www.analog.com)for ICs to do the job as well as application circuits using general purpose Op-Amps

RE: RMS to DC conversion

Hi
there is a cool IC that perfoms RMS to DC conversion. It's from MAXIM ... I don't remember the right number but i believed it was MAX687 or something.... try it at www.max-ic.com.

RE: RMS to DC conversion

There is a special case of RMS determination which might be worth mentioning.

If we have a square wave of zero volts to a unipolar peak of "E" volts (typical of much logic circuitry with zero and +5 volts) and some particular duty cycle, the average value of that waveform is E average which equals E times that duty cycle.

Then, having obtained the average, the root mean square voltage, call it E rms, equals E average divided by the square root of that duty cycle.

The average value is easily measured with any DVM and an RC low-pass filter. From that measurement, the RMS value can be calculated.

This appeared in Electronic Design for October 14, 1993 in the Ideas For Design section.

John Dunn
Ambertec, Inc.

RE: RMS to DC conversion

ref to intersil or teledyne data book for icl 7107 31/2 digit dpm application notes where fully operational true rms ckt using opamp is detailed , if you ere not able to get on your oen mail me your e mail id for the circuit

RE: RMS to DC conversion

Some companies which manufacture multimeter IC's:
-Crystal(Cirrus semiconductor).
-Maxim Semiconductor.
-Analog Devices.
-TelCom Semiconductor.
-Intersil Semiconductor.
-Teledyne Semicondutor.
-Fortune Semiconductor.
-ITRI/ERSO.

RE: RMS to DC conversion

hi
bobp
thanks for your advice.
the site recommended by you is quite useful
once again thank you.
s.rajendran
rajens@tr.dot.net.in

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