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Öğe Emulation of a constant phase element by utilizing a lattice structure based fractional-order differentiator(Elsevier GMBH, 2020) Rezazadehshabilouyoliya, Vahid; Atasoyu, Mesut; Özoğuz, SerdarIn this paper, we propose a modular Constant Phase Element (CPE) emulator, the approximation order of which is electronically adjustable. In this way, the emulator provides a limited approximation error over a range of the parameter alpha, the order of the CPE. A fractional-order differentiator has been utilized in the emulator, which is realized by rational integer-order approximations implemented based on a lattice-type structure. The advantage of lattice-type implementation is the possibility of easily changing the order of approximation. It also provides the flexibility of compromising the approximation accuracy with power consumption. The emulator is accurate over five decades of frequency [0.1 Hz, 10 kHz] and provides electronic adjustability of the CPE capacitance, order, and operation frequency. The simulation results confirm the performance of the emulator. Two fractional band-pass filters (FBPF) are presented as an application of the CPE emulator, which are employed in electroencephalography (EEG) signal processing. One of the FBPFs is employed in extracting theta and alpha waves in the frequency range of 3-13 Hz; while the other filter is used for extracting the beta waves in the range of 13-30 Hz. The power consumption of the simulated FBPFs are 2.871 mu W and 1.836 mu W, respectively.Öğe An improvement of current driving and electrical conductivity properties in covetics(Scientific Technical Research Council Turkey-Tubitak, 2021) Atasoyu, Mesut; Oral, Emin Argun; Ertuğrul, MehmetCompared to pure Cu, Cu lattice retaining carbon atoms, called a covetic material, can have better electrical conductivity. Furthermore, the incorporation of carbon nanostructures into Cu-alloys could improve the mechanical properties of Cu-alloys. In the simulation study, we investigated Joule heating due to applied DC current on molten Cu metal concerning how to improve current density of covetic materials. In addition, we will discuss interfacial effects on covetic-metal electrodes to meet better current driving performance. The covetic composite excited at one electrode (width = 10 nm) has a higher current drive capability as a value of 3.54 107 A/m2 , for 1000 A current at a temperature of 1073.2 K, this value is a constant while temperature is changing up to 1573.2 K. We measured the conductivity of the proposed covetic materials at various carbon nanotube densities at room temperature. Experimental results show the lowest resistivity value accomplished after mixing and temperature annealing as a value of 1.78 10?8 ?.m, where the covetic sample has 1.27% carbon nanotube density, and that the electrical conductivity is superior to that of Cu-carbon nanotube composites previously reporteÖğe An improvement of current driving and electrical conductivity properties incovetics(Tübitak, 2022) Atasoyu, Mesut; Oral, Emin Argun; Ertuǧrul, MehmetCompared to pure Cu, Cu lattice retaining carbon atoms, called a covetic material, can have better electrical conductivity. Furthermore, the incorporation of carbon nanostructures into Cu-alloys could improve the mechanical properties of Cu-alloys. In the simulation study, we investigated Joule heating due to applied DC current on molten Cu metal concerning how to improve current density of covetic materials. In addition, we will discuss interfacial effects on covetic-metal electrodes to meet better current driving performance. The covetic composite excited at one electrode (width = 10 nm) has a higher current drive capability as a value of 3.54 107 A/m2 , for 1000 A current at a temperature of 1073.2 K, this value is a constant while temperature is changing up to 1573.2 K. We measured the conductivity of the proposed covetic materials at various carbon nanotube densities at room temperature. Experimental results show the lowest resistivity value accomplished after mixing and temperature annealing as a value of 1.78 10?8 ?.m, where the covetic sample has 1.27% carbon nanotube density, and that the electrical conductivity is superior to that of Cu-carbon nanotube composites previously reporteÖğe Inverter based OTA Design Using gm/ID Transistor Sizing Technique(IEEE, 2021) Atasoyu, MesutIn this paper, transistor sizing of the inverter-based operational transconductance amplifier (OTA), which has been widely used in circuit applications recently, has been implemented with the gm-ID technique. Especially, considering the unit gain bandwidth, this design parameter is optmized with this technique. The proposed inverter-based OTA gain is 25dB, and the unity gain bandwidth value is 4.82 MHz, which is the simulation result, and 4.77 MHz, which is the calculated value. The simulated unit gain bandwidth frequency value, in particular, agrees with the measured value.Öğe Inverter based OTA design using gm/IDtransistor sizing technique(IEEE, 2021) Atasoyu, MesutIn this paper, transistor sizing of the inverter-based operational transconductance amplifier (OTA), which has been widely used in circuit applications recently, has been implemented with the gm-ID technique. Especially, considering the unit gain bandwidth, this design parameter is optmized with this technique. The proposed inverter-based OTA gain is 25dB, and the unity gain bandwidth value is 4.82 MHz, which is the simulation result, and 4.77 MHz, which is the calculated value. The simulated unit gain bandwidth frequency value, in particular, agrees with the measured value.
