Charge amplifier using opamp

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deepakkev

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Hi All,
I am trying to simulate the circuit of an charge amplifier, but i am not finding a way to model a charge source.
The device that has to be interfaced is a transducer which outputs differential charge, but the data-sheet gives the output range to be 4.4uV to 5mV.How should I interpret this?
And the device i was planning to use is AD8620 is it suitable? :?:
 


You could model the charge source as a current pulse generator coupled to the input via a small capacitor. As an example of a current pulse, a 160nA 1ns should inject 1000e- of charge to the input of your charge amp.

May i ask what kind of transducer is it?

I am not familiar with the AD8620, but previewing it, it looks like a good candidate (JFETs are so nice).
 
The transducer is an accelerometer

I am concerned because the offset of AD8620=100uV>4.4uV(input range) and is it advisable to use it with offset adjustment:?:
 

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