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Operational Amplifier for a sensor with picoAmps signal.

I have a Piezoelectric sensor that I want to study and use. I need for that a preamplifying circuit with ultralow input noise. The sensor outputs current in the order of picoampers. Any recommendations on an interesting Amplifier or even circuit design to use ? The lumped element model of the Piezo sensor is the same as a Photodiode: a curent source in parallel with a 1G Resistor and a 6pF Capacitor. 

Thanks for the help.  

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