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I need a circuit or component which converts bipolar voltage to bipolar current. I have found the XTR111 from Texas Instruments and the 1B22 from Analog Devices. However, they only convert 0-10 V to 0-20 mA current.

I to need convert -10V-0V to -10mA-0mA too (the opposite polarity range). How can I do that? Or can I add a circuit to work with 1B22 or XTR111?

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Try the Howland current pump: -

enter image description here

Here's an article that gives a lot of mathematical insight into it but is not inaccessible to the equation-hater.

AN-1515A is an article by TI on the subject.

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  • \$\begingroup\$ Thank you for your reply. I have found a component that is XTR300 from texas instruments. This is the link: ti.com/lit/ds/symlink/xtr300.pdf. \$\endgroup\$ – Cem Feb 3 '16 at 8:10
  • \$\begingroup\$ It looks interesting but I can't say whether it will work for you. Watch out for the maximum capacitance (1uF) you can apply to the output. \$\endgroup\$ – Andy aka Feb 3 '16 at 8:23

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