How to Ultra-low voltage AC-DC Convertor (Need something similar to LTC3108)

Hi Power by Linear,

I have a ranging voltage of 0-340mV AC that I wish to step up and convert to DC. Most rectifiers will draw at least 400mV resulting in no more voltage to be converted to DC.  I am most interested in the LTC3108 DC-DC converter as it will both step up the voltage, and hold it steady for the operating voltages of 20-500mV. Do you have any suggestions?

Respectfully,

John

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