4 sonuçlar
Arama Sonuçları
Listeleniyor 1 - 4 / 4
Yayın Immitance data modelling via linear interpolation techniques: a classical circuit theory approach(Wiley-Blackwell, 2004-11) Yarman, Bekir Sıddık Binboğa; Kılınç, Ali; Aksen, AhmetWith the advancement of the manufacturing technologies to produce new generation analog/digital communication systems, immitance data modelling has gained renewed importance in the literature. Specifically, models are utilized for behaviour characterization, simulation of physical devices or to design sub-systems with active and passive solid-state devices. Therefore, in this paper, new computer aided tools are presented to model one port immitance data by means of linear interpolation techniques. The basic philosophy of the new modelling tools is based on the numerical decomposition of the immitance data into its minimum and Foster parts. Computer algorithms are presented to model the minimum and the Foster parts of the given immitance data. Implementations of these algorithms are exhibited by means of examples. Depending on the application, modelling tools based on linear interpolation techniques may present 'computational and practical' advantages over the existing interpolation techniques, non-linear curve fittings or regression methods. It is expected that the new modelling tools will be utilized to provide initial circuit topologies to the commercially available analysis/simulation and design packages.Yayın High precision LC ladder synthesis part I: Lowpass ladder synthesis via parametric approach(IEEE-Inst Electrical Electronics Engineers Inc, 2013-08) Kılınç, Ali; Yarman, Bekir Sıddık BinboğaIn this paper, a novel, high precision lowpass LC ladder synthesis algorithm is presented. The new algorithm directly works on the driving point input immitance function which describes the lowpass LC ladder in resistive termination. The crux of the idea is that, at each step of the proposed method, a simple pole at infinity is removed then, the remaining immitance function is corrected using the parametric method. Parametric method warrants the exact lowpass LC ladder nature of the remaining immitance function. Thus, at the end of the synthesis process, a lowpass LC ladder is obtained with high numerical precision. Examples are presented to exhibit the implementation of the synthesis algorithm. A randomly generated driving point input immitance is synthesized with 19 elements yielding a relative error less than 10(-6). Furthermore, numerical robustness of the novel synthesis method is tested. Based on the tests, we can confidently state that, proposed synthesis algorithm can safely extract more than 40 elements from the original immitance function with a relative error less than 10(-2). Newly developed synthesis algorithm is coded on MatLab environment and it is successfully combined with the "Real Frequency-Direct Computational Technique" to construct practical impedance matching networks.Yayın An immitance based tool for modelling passive one-port devices by means of darlington equivalents(Urban & Fischer Verlag, 2001) Yarman, Bekir Sıddık Binboğa; Aksen, Ahmet; Kılınç, AliAn immitance-based method is presented to model measured or computed data, obtained from a "passive one-port physical device" by means of its Darlington equivalent. In other words, the given data is modelled as a lossless two port terminated in a unit resistor. The basis of the new modelling tool rests on the numerical decomposition of the given immitance data into its Foster and minimum parts. Therefore, the proposed technique does not require any choice for the circuit topology to build the model. Rather, the optimum circuit topology that characterises the given data is the natural consequence of the modelling process proposed in this paper. A main algorithm is presented to construct the model from the given data. It is expected that the proposed modelling tool will find practical applications in the behaviour characterisation, simulation, and design of high speed/high frequency analog/digital mobile communication sub-systems manufactured on VLSI chips. An antenna-modelling example is included to systematically exhibit the implementation of the modelling technique.Yayın High precision LC ladder synthesis part ıı: Immittance synthesis with transmission zeros at DC and infinity(IEEE-INST Electrical Electronics Engineers Inc, 2013-10) Yarman, Bekir Sıddık Binboğa; Kılınç, AliIn this paper, a novel, high precision bandpass LC ladder synthesis algorithm is presented. The new algorithm directly works on the rational form of a positive real driving point input immittance F(p) = a(p)/b(p) which describes a bandpass LC ladder network in resistive termination. In the new method, firstly, poles at p = 0 are removed from F(p), then remaining poles at infinity are extracted. After each pole extraction, coefficients of the polynomial a(p) and b(p) are refined employing the parametric approach to yield an exact bandpass LC ladder which in turn prevents the accumulation of the numerical errors in the course of synthesis. Thus, at the end of synthesis process, a bandpass LC ladder is obtained with high numerical precision.
