charge amplifier - how to design it, method to count ions

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amolbook

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charge amplifier

hii....
im designing an ion counter... to count ions in air i want to amplify pico coulomb(pC) charge of an ions. charge will be in the range of 1000pC- 100000pC
how to design charge amplifier?
or any other method to count ions??

thanx
 

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