Derivative-free active-RC elliptic filter using cascade of biquads in 28 nm CMOS. - Shankar Thirunakkarasu; Frank Singor; Jie Fang; Sivakumar Ganesan; Jose Fabian Silva-Rivas; Kannan Deenadayalan; Bharath Kumar Thandri; Chaoming Zhang; Xuefeng Yu; Nand Jha; Ardie G. Venes (MWSCAS, 2015)