Wadhwa, Nishtha, Pydi Ganga Bahubalindruni, Kamal Chapagai, Joao Goes, Sujay Deb, and Pedro Barquinha. "Sixth?order differential Sallen?and?Key switched capacitor LPF using a?IGZO TFTs." Int J Circ Theor Appl..no. 47 (2019): pp. 32-42.