Yazar "Kuntman, Hulusi Hakan" seçeneğine göre listele

Listeleniyor 1 - 9 / 9
  • Küçük Resim
    Öğe
    A new memristor-based low-pass filter topology and its small-signal solution using MacLaurin series
    (Natl Inst Optoelectronics, 2015) Yener, Şuayb Çağrı; Mutlu, Reşat; Kuntman, Hulusi Hakan
    In this work, a new memristor-based low-pass filter topology is suggested. Memristor-based filters are nonlinear circuits and many of them cannot be solved analytically. To find an approximate analytical solution of the filter equations, MacLaurin series is used for the first time. Time and frequency domain behavior of the filter are obtained. Also, the frequency domain gain and total harmonic distortion characteristics of the filter are given. Results obtained by the small signal model have been compared with the dynamic model results. It is shown that the small signal model is able to predict the filter behavior very well.
  • Küçük Resim
    Öğe
    Analysis of filter characteristics based on PWL Memristor
    (Istanbul Univ, Fac Engineering, 2014) Yener, Şuayb Çağrı; Mutlu, Reşat; Kuntman, Hulusi Hakan
    Memristor is claimed as a passive two terminal fundamental circuit element in 1971 and declared to be physically fabricated in 2008. The memristor can provide new features in analog circuit design thanks to its properties which cannot be mimicked by a resistor, a capacitor and an inductor. It is believed that in future it can be used in analog applications such as programmable amplifiers, oscillators, filters and chaotic sources. In this paper, detailed simulations of a low-pass filter and a high-pass filter with memristor are done using a piece-wise linear hypothetical memristor characteristic for sinusoidal input. The memristive switching issue in these filters is analyzed. Also the total harmonic distortions of the memristor based filters are inspected as a function of charge and the input signal frequency using simulations.
  • Küçük Resim
    Öğe
    Examination of a Memristor-Based Low-Pass Filter Topology
    (IEEE, 2017) Yener, Şuayb Çağrı; Mutlu, Reşat; Kuntman, Hulusi Hakan
    In this work, a memristor based low-pass filter topology in which a memristor is placed as the input element and a capacitor is placed as the negative feedback element to an inverting op-amp is examined. The memristor provides adjustable gain characteristic to the filter. Analytical solution of the filter is obtained its output voltage, the memristor current, and the capacitor voltage are found as a function of time. To obtain the filter small-signal model and examine its frequency behavior, Maclaurin series expansion for the output voltage is performed. Time and frequency domain simulations of the filter are done using both small signal and dynamic models of the filter. The frequency domain gain and THD characteristic of the filter are also obtained using both of the models. Simulation results of both of the models are compared. It is shown that the small signal model is able to predict the filter behavior accurately for small signals. It has been also found that, for this topology at low frequencies, the input signal magnitude should be limited for a low distortion.
  • Küçük Resim
    Öğe
    Frequency and Time Domain Characteristics of Memristor-Based Filters
    (IEEE, 2014) Yener, Şuayb Çağrı; Mutlu, Reşat; Kuntman, Hulusi Hakan
    Memristor, regarded as the new fourth fundamental circuit element by many, is also being considered for analog applications. It is expected that analog filters with memristors will provide some characteristics which cannot be mimicked by resistors. In this study, memristor-based low-pass and high-pass filters are analyzed and their performance demonstrated with simulations in time and frequency domains. Saturation of the memristor in the memristor-based filters at low frequencies and distortion resulting from it are observed. Also gain and total harmonic distortion of the filters as a function of frequency are given. The results obtained in this work can be used to design, memristor-based low-pass and high-pass filters.
  • Küçük Resim
    Öğe
    Memristor Based Sallen-Key Filters
    (Gazi Univ, Fac Engineering Architecture, 2015) Yener, Şuayb Çağrı; Mutlu, Reşat; Kuntman, Hulusi Hakan
    In 1971, memristor is claimed as a missing circuit element and almost 40 years later than its prediction a memristive system behaving as a memristor has been found in 2008. Memristor is accepted by many as the new and the fourth fundamental circuit element. Analog applications of memristor have emerged as a new research area in recent years. An analog filter with memristor can have automatically adjustable gain, quality factor and bandwidth characteristics etc. thanks to its variable memristance. In this paper, two different types of second-order Sallen-Key filters, which are the low-pass and the high-pass Sallen Key filters, are analyzed using simulations. The linear drift model of TiO2 memristor is used in all analysis and simulations. It has been found that the memristor in the filters can go into saturation at very low frequencies and both of the filters operate well at higher frequencies. A criterion is suggested to prevent memristor from going into saturation and to prevent distortion at low frequencies. Using the criteria and choosing a memristor with more appropriate parameters, the simulations are repeated for the low-pass filter and it is shown that the low-pass filter operates better with the new parameters chosen. The analysis and the criteria given in this paper can be used to design memristor-based Sallen-Key filters and adaptable to other memristor-based filters as well.
  • Küçük Resim
    Öğe
    Memristor Temelli Sallen-Key Süzgeçler
    (2015) Yener, Şuayb Çağrı; Mutlu, Reşat; Kuntman, Hulusi Hakan
    Memristör 1971 yılında kuramsal olarak ortaya konmuş ve bundan yaklaşık 40 yıl sonra, 2008 yılında memristör davranışına sahip bir memristif sistem bulunmuştur. Memristör günümüzde yaygın biçimde dördüncü temel devre elemanı olarak kabul edilmektedir. Memristörün analog devreler alanında uygulamaları, üzerine artarak ilgi duyulan önemli bir çalışma alanıdır. Memristör temelli analog süzgeçler ayarlanabilir memristans özelliği sayesinde kazanç, değer katsayısı vb. süzgeç özelliklerinde klasik devre elemanları ile sağlanamayan otomatik ayarlanabilme özelliği getirmektedir. Bu çalışmada literatürde ilk kez alçak-geçiren ve yüksek-geçiren olmak üzere iki farklı tip memristör temelli Sallen-Key süzgeç analizi ve bunlara ilişkin benzetim sonuçları sunulmaktadır. Süzgeçler memristörün TiO2 doğrusal sürüklenme modeli temel alınarak tasarlanmış ve analiz edilmiştir. Çok düşük frekanslarda doyum durumunun oluştuğu gözlenmiş, daha yüksek frekanslarda ise her iki süzgeçte de başarım için bir sınırlama ortaya çıkmadığı belirlenmiştir. Memristör temelli Sallen-Key süzgeçlerin tasarımında kullanılmak üzere doyma ve buna karşılık bozulmanın ortaya çıkmamasına yönelik tasarım kriterleri verilmiştir. Verilen kriterler ve buna ilişkin uygun memristör parametreleri kullanıldığında düşük frekanslarda da süzgeçlerin gerekli başarım koşullarını yerine getirdiği gösterilmiştir. Analiz sonuçları ve verilen tasarım kriterleri memristör temelli Sallen-Key ve diğer tip süzgeçlerin tasarımlarında kullanılabilir.
  • Küçük Resim
    Öğe
    Memristor-based timing circuit
    (Institute of Electrical and Electronics Engineers Inc., 2017) Yener, Şuayb Çağrı; Mutlu, Reşat; Yener, Tuba; Kuntman, Hulusi Hakan
    Memristor has been proposed as the fourth missing fundamental circuit element in 1971. This new circuit element has a charge controlled resistance, saturation mechanism and zero-crossing hysteresis loop which cannot be mimicked by previously known circuit elements. It is a promising candidate for both digital and analog electric circuit applications. In this work, a memristor based timer circuit is proposed. Concept of the circuit is presented and its analysis is done. Simulation of the timer is done using the linear drift model of the TiO2 memristor and the result is compared to the analytical calculations. © 2017 IEEE.
  • Küçük Resim
    Öğe
    Performance Analysis of a Memristor - Based Biquad Filter Using a Dynamic Model
    (Soc Microelectronics, Electron Components Materials-Midem, 2014) Yener, Şuayb Çağrı; Mutlu, Reşat; Kuntman, Hulusi Hakan
    New kinds of programmable amplifiers, adaptive filters, and programmable oscillators can be designed using a new fundamental circuit element memristor. Application of the memristor to analog filters can result in many new properties especially thanks to its variable memristance. In this paper, by using linear drift memristance model, a memristor-based biquad analog filter is examined. The filter is simulated using its dynamic model. The linear dopant drift model of TiO2 memristor is used in the simulations. Simulations have shown that the filter components such as gain and quality factor can be adjusted using the memristor in biquad filter. It has also been observed that memristor may go into saturation at very low frequencies and very low charge values. Considering the results of this study, the tunable memristance gives filters an adjustable characteristic which cannot be obtained by traditional resistors. Results presented in this study can also be considered when designing biquad filters with memristors to ensure their stability and high performance.
  • Küçük Resim Yok
    Öğe
    Small signal analysis of memristor-based low-pass and high-pass filters using the perturbation theory
    (Natl Inst Optoelectronics, 2018) Yener, Şuayb Çağrı; Mutlu, Reşat; Kuntman, Hulusi Hakan
    In this study, perturbation theory has been used for the first time in literature to do small-signal analysis and solution of the memristor-based low-pass and high-pass filters are given using perturbation theory. The time and frequency domain memristor-based filter behaviors are obtained analytically. It has been found that the second harmonic does exist and is dominant and its behavior as a function of frequency is inspected in these filters. The gain responses and the total harmonic distortions of the filters are also given. Results obtained from the perturbation theory are in good agreement with that of numerical simulations and this confirms the accuracy and the performance of the method.