Scanning Tunneling Microscopy Feedback

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Thread Starter

Voutiras Chris

I am currently working on a project, where I have to design a feedback circuit for a scanning tunneling microscope. I have to take the logarithm of the error signal, but the only log amp I have has an output V=k*log(I1/I2), where V the output voltage and I1, I2 the input currents.
The error signal is a voltage of some mV (<400mV)
How can I convert this signal into an input current?
Moreover I am interested in knowing people who have experience in STM electronics.
Thanks
 
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