Femto ampere current measurement

Dear Hari,

To make measurements this small, you typically need to turn to an instrumentation amplifier. I will request Mayrim to move your request to the proper forum. Thanks!

Carolus

Hi ,

 Could you please tell me how to measure current in the range of femto amperes.

 What is the signal chain associated with it. How to select components for the same.

Regards

Hari

Hello Hari,

This is a very broad subject...you need to be more specific about the application.

As a start, see the Femtoamp EDN articles:

http://www.edn.com/design/analog/4368681/Design-femtoampere-circuits-with-low-leakage-part-one 

http://www.edn.com/design/analog/4375459/Design-femtoampere-circuits-with-low-leakage---Part-2--Component-selection

http://www.edn.com/design/analog/4395651/Design-femtoampere-circuits-with-low-leakage---Part-3--Low-current-design-techniques

Also see the Keithley Low Level Measurements Handbook, chapters 1 & 2.

http://www.keithley.com/knowledgecenter/knowledgecenter_pdf/LowLevMsHandbk.pdf

Regards,