Suggest me a V to I converter circuit

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Hi all,
Can you suggest me any circuits that work as V to I converter as shown in the attached file.
I am trying design ring CCO with.
Thanks alot.
 

v-i converter

A V-I converter is simply a resistor. You could use a transimpedance amplifier or something similar.

here's the first one I found on google,

http://www.ecircuitcenter.com/Circuits/opitov/opitov.htm

but really, a resistor is all you need. You're just supplying a current to a current mirror.
 

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