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First I think you have to divide your input range by 20 to bring it down to 0.1 to 1V.
Now you could use a true RMS to DC conversion IC from Analog Devices like AD8362, see link: **broken link removed**
Of course there are such ICs from other manufacturers too, if you google for them.
Regards
unkarc
PS: I found an interesting circuit for you in Electronic Design magazine, see this link: **broken link removed**
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