Electronically and Orthogonally Tunable SITO Voltage-Mode Multifunction Biquad Filter Using LT1228s. ELEKTRON ELEKTROTECH [Internet]. 2021 Oct. 27 [cited 2025 Dec. 5];27(5):11-7. Available from: https://eejournal.ktu.lt/index.php/elt/article/view/28949