Slawomir Koziel Stanislaw Szczepanski Rolf Schaumann Design of highly linear tunable CMOS OTA. 731-734 2002 ISCAS (3) http://doi.ieeecomputersociety.org/10.1109/ISCAS.2002.1010328 db/conf/iscas/iscas2002-3.html#KozielSS02