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Yayın Metamutator applications: a quadrature MOS only oscillator and transconductance/transimpedance amplifiers(Springer New York LLC, 2016-06-18) Göknar, İzzet Cem; Yıldız, Merih; Minaei, ShahramNMOS based circuit realizations of a sinusoidal quadrature oscillator, a transconductance, a transimpedance amplifier are presented. All the circuits are constructed with a voltage-mode “Metamutator” consisting of an analog adder and a subtractor which is one of its possible realizations. The most important feature of the proposed circuits is their extremely simple structures containing only twelve NMOS transistors (six for adder, six for subtractor). Another significant advantage of the proposed circuits is that no external passive element is needed for the oscillator and only one resistor is used for each amplifier circuit; a variable resistor can provide gain adjustability. The post-layout simulations of all the proposed circuits have been executed using TSMC 0.25 µm process parameters with ±1.25 V power supply voltage.Yayın Current inverting metamutator, its implementation with a new single active device and applications(2018-10) Minayi, Elham; Göknar, İzzet CemA new kind of metamutator, namely "Current Inverting Metamutator", its realizations using different types of active blocks and some of its applications like voltage-mode universal biquadratic filter with three input and one output terminals are presented. The proposed circuits can realize all standard filters, namely, low-pass, band-pass, high-pass, notch and all-pass without passive component matching conditions. The proposed circuit offers the features of using grounded capacitors and orthogonal controllability of angular frequency and quality factor. Then a novel realization of metamutator with one active device, additive and differential IC (AD-IC) is proposed and implemented with twelve transistors only. The metamutator with AD-IC has the advantages: (1) of creating new realizations of memristors, capacitance multipliers, inductor simulators, frequency dependent negative resistors which can be used to make IC active filters, (2) less is the number (only one) of active devices, less is the amount of disparity, (3) no need to match passive component values.Yayın Current inverting metamutator, its implementation with a new single active device and applications (vol 97, pg 15, 2019)(Springer, 2019-11) Minayi, Elham; Göknar, İzzet CemVoltage Inverting Metamutator (VIM) and Current.Yayın IEEE CAS Activities In Central America And Mexico(IEEE, 2021) Yarman, Bekir Sıddık Binboğa; Göknar, İzzet CemReports on CASS chapter activities in Central America and Mexico.Yayın A fractional-order transitional Butterworth-Butterworth filter and its experimental validation(IEEE, 2021) Mahata, Shibendu; Herencsar, Norbert; Kubanek, David; Kar, Rajib; Mandal, Durbadal; Göknar, İzzet CemThis paper introduces the generalization of the classical Transitional Butterworth-Butterworth Filter (TBBF) to the Fractional-Order (FO) domain. Stable rational approximants of the FO-TBBF are optimally realized. Several design examples demonstrate the robustness and modeling efficacy of the proposed method. Practical circuit implementation using the current feedback operational amplifier employed as an active element is presented. Experimental results endorse good agreement (R-2 = 0.999968) with the theoretical magnitude-frequency characteristic.Yayın Optimized fractional-order Butterworth filter design in complex F-plane(Springer Nature, 2022-10) Mahata, Shibendu; Herencsar, Norbert; Kubanek, David; Göknar, İzzet CemThis paper introduces a new technique to optimally design the fractional-order Butterworth low-pass filter in the complex F-plane. Design stability is assured by incorporating the critical phase angle as an inequality constraint. The poles of the proposed approximants reside on the unit circle in the stable region of the F-plane. The improved accuracy of the suggested scheme as compared to the recently published literature is demonstrated. A mixed-integer genetic algorithm which considers the parallel combinations of resistors and capacitors for the Valsa network is used to optimize the frequency responses of the fractional-order capacitor emulators as part of the experimental verification using the Sallen–Key filter topology. The total harmonic distortion and spurious-free dynamic range of the practical 1.5th-order Butterwoth filter are measured as 0.13% and 62.18 dBc, respectively; the maximum and mean absolute relative magnitude errors are 0.03929 and 0.02051, respectively.Yayın Comment on "storage and dissipation limits in resonant switched-capacitor converters"(Hindawi Ltd, 2018-10-31) Göknar, İzzet CemThe purpose of this note is (i) to point to a reference missing in the paper (Mayo-Maldonado et al., 2018) and (ii) to show that some of its content is covered in a more general setting by the results in that reference (Goknar, 1972).Yayın Metamutator based universal, single input multi output current mode filter(John Wiley and Sons Ltd, 2023-03) Göknar, İzzet Cem; Minayi, ElhamThe introduction of Add - Differentiate IC, AD-IC, a new integrated circuit, into schemes for realizing single input multiple output current mode filters is the motivation behind this paper. In the circuit structure of this filter with only one active device with a minimal number of transistors and five passive components are being used. Non ideal effects of the design are investigated and simulation results of the application, using TSMC 0.25 ?m process parameters with ±1.25 V power supply voltage and the bias (Formula presented.) as 0.8 V resulting in 0.99 mW power dissipation for the entire filter, are also presented to confirm the theoretical analysis. With this new design technique, the tunabilities of the angular frequency ((Formula presented.)) and quality factor ((Formula presented.)) can be performed independently.Yayın Design of voltage-mode and current-mode PID controllers using a single Add-Differentiate IC (AD-IC)(Birkhauser, 2025-12-22) Minayi, Elham; Göknar, İzzet CemIn this paper, voltage and current mode proportional–integral–derivative (PID) controller circuits are presented in one topology, utilizing only a single active component, Add-Differentiate Integrated Circuit (AD-IC) along with two passive resistors and two passive capacitors. The effectiveness and performance of the proposed circuits are validated through sensitivity, non-ideality analyses and PSPICE and MatLab simulations.
