Sinem ÖlmezUǧur Çam2025-10-06201013036203, 130006321303-620310.3906/elk-0904-11https://www.scopus.com/inward/record.uri?eid=2-s2.0-76749121471&doi=10.3906%2Felk-0904-11&partnerID=40&md5=ca818290bef591c41a208841c60bbca7https://gcris.yasar.edu.tr/handle/123456789/10307In this paper a new square-root domain first order all-pass filter based on the MOSFET square law is presented. The proposed filter is designed by using nonlinear mapping on the state variables of a state space description of the transfer function. To the best knowledge of the authors the filter is the first square-root domain first order all-pass structure designed by using state space synthesis method in the literature. The center frequency of the all-pass filter is not only attainable at megahertz frequencies but also tunable by an external bias current. The proposed filter operated 2.5 V supply voltage is constructed by current mirrors geometric mean circuits a linear transconductor circuit and a capacitor. SPICE simulations are given to approve the theoretical analysis. © TÜBİTAK. © 2010 Elsevier B.V. All rights reserved.EnglishAll-pass Filter, Square-root Domain Circuits, State-space Synthesis, All-pass Filter, Center Frequency, Current Mirrors, First Order, Geometric Mean, Linear Transconductors, Megahertz Frequencies, Mos-fet, Nonlinear Mappings, Spice Simulations, Square-root, State Variables, State-space, State-space Description, Supply Voltages, Synthesis Method, Low Pass FiltersAll-pass filter, Center frequency, Current mirrors, First order, Geometric mean, Linear transconductors, Megahertz frequencies, MOS-FET, Nonlinear mappings, SPICE simulations, Square-root, State variables, State-space, State-space description, Supply voltages, Synthesis method, Low pass filtersArticle