Tripetch, K. K., and N. Nakano. “Design of High Order LPF With on Chip Active Inductor Using 0.18 Micron CMOS Technology”. Journal of Telecommunication, Electronic and Computer Engineering (JTEC), vol. 9, no. 2-8, Sept. 2017, pp. 85-90, https://jtec.utem.edu.my/jtec/article/view/2633.