Here is a quick video that goes over some basic building blocks for synthesizing Voltage Controlled Filters using OTA’s.

And here are some interesting papers if you feel more curious:

http://class.ece.iastate.edu/vlsi2/docs/Linked%20Publications/1985-03-ICADM-RG.pdf

http://www.idea2ic.com/LM13600/UsingOTAs2.pdf

http://class.ece.iastate.edu/vlsi2/docs/Linked%20Publications/1983-05-ISCAS-RL.pdf

http://electronotes.netfirms.com/EN85VCF.PDF

http://www.cmsworldwide.com/iscas2004/tutoriallinked_files/1_sanchez_silva.pdf

http://www.ece.gatech.edu/academic/courses/ece6414/References/Hasler_gmCFilter01.pdf

http://www.onsemi.com/pub_link/Collateral/NE5517-D.PDF



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