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Hello,
We are looking at using an energy harvest with ~1k impedance range, AC, 10’s to 1,000’s of mV but less than piezo.
So, we need AC-capable and ultra-low startup voltage.
Would you have an IC or bridge recommendation that would work?
Thank you, Keith
Keith,
The closest rectifier components I could find a few years back is below. You would still need about 300mV.
A depletion mode FET might work better but most I have seen have very wide VGSth that cross 0V.
From follow up discussions, we are probably going to need a depletion mode FET.
Here is the circuit.
e 
voltage levels
