Voltage Controlled Current Source

http://www.google.co.kr/webhp?hl=ko&tab=ww#q=voltage+control+current+source+circuit&hl=ko&newwindow=1&prmd=imvnsul&psj=1&ei=-6nrT7OJHsalrQHunfHJBQ&start=10&sa=N&bav=on.2,or.r_gc.r_pw.r_qf.,cf.osb&fp=d1974889c519bd12&biw=826&bih=619

Voltage Controlled Current Source

http://circuits.linear.com/251

4-20 mA source circuit

http://circuitelec.blogspot.kr/2009/03/4-20-ma-source-circuit.html

The FET Constant-Current Source/Limiter

http://www.vishay.com/docs/70596/70596.pdf

FET Current Sources

http://users.ece.gatech.edu/mleach/ece3050/notes/ISources/isources.pdf

Unified Current-Source Control for Low-Power

Current-Mode-Logic Bit-Serial Circuits

http://www.kameyama.ecei.tohoku.ac.jp/papers_pdf/4673a104.pdf

+/-5A Voltage Controlled Current Source

http://www.kmitl.ac.th/~kswichit/VCCS/vccs.htm