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Using differential Amplifier on LTC1968, and the input voltage changes; please help

I am currently using LTC1968 to output DC RMS value from a sine wave signal input, and the output of the LTC1968 is connected to the differential amplifier. The issue is after connecting the LTC1968 output to the differential amplifier, the LTC1968 signal gets affected (the voltage decreases). Can anyone please explain me why this is happening, and how can I fix this issue?


I hope to hear your response.

Thank you

fixed mistakes.
[edited by: shurp at 7:10 PM (GMT -4) on 21 Sep 2021]
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