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Subject: charge amplifier problem

Date: 10/10/02 at 2:10 PM
Posted by: Daniel
E-mail: volkmann@glue.umd.edu
Message Posted:

Hi all,

for my studies i have to design a charge amplifier for a piezoelement with a capacity of 10pF and a charge of 10aC. I have to design this circuit for a frequency range from 1Hz to 1 MHz, changing the charge of 10aC to an output voltage of 10mV. this means that i need an opamp with a very high Gain-Bandwidth-Product(around 2GHz). Now I reached the problem that this Opamp also has to have low leakage, low noise, and high precision, what is hard to find. Does anyone knows such an opamp or knows a good source to search? Perhaps someone has a tricky idea how to use lower GB-Opamps?
hopefully you understood my description, if not, just complain, i can try it again.

Thanks

Daniel


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