I want to store the energy in capacitor for future use. The aim is thus for power and not signal processing. Currently, I am looking at precision recifiers for this. Are they good? Will the slew rate have any effect on the energy storage?
I think ,Direct AC-DC boost Converter will work better in this respect.You can consult the papers available.
https://www.google.co.in/?gws_rd=ssl#q=low+ac+to+low+dc+converter
What frequency range are you working with? What is the maximum current capability of your source? Is this for energy harvesting? is there another power source available?
A precision rectifier using an op-amp will not be good for energy storage. The energy from it's output is from the power supply used to run the circuit, not the input signal. Op-amps have a high input impedance and ultimately only look at voltage on the input. You need to store current in the capacitor so you'll need a circuit that can maximize the current sourcing capability of your signal source.
I recommend using a transformer to step up your voltage so you can use Schottky diodes in your rectifier. If the frequency is in the right range for the transformer design, your efficiency could be better than 70%.
I used OPAMs, for rectify-amplify circuit of the weak signal of model, I developed. Refer my paper, 'One cycle inrush blocking scheme for differential relay..........'
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