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lower current measurement techniques

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sooraj sreedhar

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ozone sensor interface electronics for radiosonde

hai ,

now i am decided to doing a new project.. actually it is a ozonesonde....in this project i want to measure current..it is a lower current in the range of 0-8 microamp...the current should be meaured using spi or i2c iterfaced ic's.. this ic should be interfaced to a mothercard..
the the resolution should be one nanoamps...


heeyy please suggest a good techniques for measuring lower current and ic...



So, please suggest a smart way to do it, I appreciate every comments, links, schematics, etc.

thxxx,
sooraj sreedhar
 
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this kind of circuit need a interfacing with very high input impedance opamp....refer V to I convertor with (Mega ohm range base) and look for opamp CA3140 .....it have very high input impedance and very less leakage current may be you will able to measure the things....

Good Luck
 

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