The Experts below are selected from a list of 228 Experts worldwide ranked by ideXlab platform
Ahmed M. Soliman - One of the best experts on this subject based on the ideXlab platform.
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HISTORY AND PROGRESS OF THE TOW-THOMAS BIQUADRATIC FILTER PART II: OTRA, CCII, AND DVCC REALIZATIONS
Journal of Circuits Systems and Computers, 2008Co-Authors: Ahmed M. SolimanAbstract:The realization of the Tow–Thomas (TT) circuit using the Operational Transresistance Amplifier (OTRA) is reviewed. The circuit employs two OTRA, and all passive elements are floating as the original Tow–Thomas circuit. The Current Conveyor (CCII) TT circuits are reviewed next. The progress in the realization of the TT circuit using CCII is demonstrated clearly by summarizing eight different circuits. One of the circuits has the advantage of very high input impedance using all grounded resistors and capacitors. The Differential Voltage Current Conveyor (DVCC) as the active building block in realizing the TT circuit is also considered. Finally, current mode TT circuits using balanced output CCII are summarized. Top Spice (level 49), simulation results using technology SCN 05 feature size 0.5 μm from MOSIS vendor: AGILENT are included to demonstrate the magnitude and Phase Frequency Response of the TT circuits. Additional simulation results for the total power dissipation, total harmonic distortion, intermodulation IM3, input and output referred noise spectral densities are also included for comparison purposes.
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HISTORY AND PROGRESS OF THE TOW–THOMAS BIQUADRATIC FILTER PART II: OTRA, CCII, AND DVCC REALIZATIONS
Journal of Circuits Systems and Computers, 2008Co-Authors: Ahmed M. SolimanAbstract:The realization of the Tow–Thomas (TT) circuit using the Operational Transresistance Amplifier (OTRA) is reviewed. The circuit employs two OTRA, and all passive elements are floating as the original Tow–Thomas circuit. The Current Conveyor (CCII) TT circuits are reviewed next. The progress in the realization of the TT circuit using CCII is demonstrated clearly by summarizing eight different circuits. One of the circuits has the advantage of very high input impedance using all grounded resistors and capacitors. The Differential Voltage Current Conveyor (DVCC) as the active building block in realizing the TT circuit is also considered. Finally, current mode TT circuits using balanced output CCII are summarized. Top Spice (level 49), simulation results using technology SCN 05 feature size 0.5 μm from MOSIS vendor: AGILENT are included to demonstrate the magnitude and Phase Frequency Response of the TT circuits. Additional simulation results for the total power dissipation, total harmonic distortion, intermodulation IM3, input and output referred noise spectral densities are also included for comparison purposes.
Mohammad Saleh Tavazoei - One of the best experts on this subject based on the ideXlab platform.
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Algebraic bound for the Phase–Frequency Response of the commande robuste d'ordre non-entier approximation of fractional differentiators and its applications in control systems analysis
Journal of Vibration and Control, 2021Co-Authors: Khashayar Neshat, Mohammad Saleh TavazoeiAbstract:This article deals with analyzing the Phase–Frequency Response of commande robuste d'ordre non-entier approximations of fractional-order differentiators. More precisely, an algebraic tight upper bo...
Khashayar Neshat - One of the best experts on this subject based on the ideXlab platform.
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Algebraic bound for the Phase–Frequency Response of the commande robuste d'ordre non-entier approximation of fractional differentiators and its applications in control systems analysis
Journal of Vibration and Control, 2021Co-Authors: Khashayar Neshat, Mohammad Saleh TavazoeiAbstract:This article deals with analyzing the Phase–Frequency Response of commande robuste d'ordre non-entier approximations of fractional-order differentiators. More precisely, an algebraic tight upper bo...
Safieddin Safavi-naeini - One of the best experts on this subject based on the ideXlab platform.
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Tunable Substrate Integrated Waveguide Phase Shifter Using High Dielectric Constant Slab
IEEE Microwave and Wireless Components Letters, 2020Co-Authors: Zahra Rahimian Omam, Wael M. Abdel-wahab, Ali Pourziad, Saeid Nikmehr, Ardeshir Palizban, Suren Gigoyan, Safieddin Safavi-naeiniAbstract:This letter presents a low-cost, low-profile, and high-performance $Ka$ -band continuously tunable substrate integrated waveguide (SIW) Phase shifter. The proposed Phase shifter consists of a slot cut on the SIW’s broad wall and a high dielectric constant slab over the slot. The Phase-shifting mechanism is based on perturbing the electric field of the SIW’s fundamental mode, TE10-like, by putting a high dielectric constant slab over the slot of SIW structure to create slow wave phenomena. A prototype is designed, fabricated, and measured. The fabricated Phase shifter exhibits linear Phase–Frequency Response behavior with an average insertion loss less than 1.5 dB with an insertion loss variation less than 0.5 dB over a Phase shift range of 275° in the operating Frequency band (29–31 GHz). The Phase shifter consumes a maximum of 25-mW power.
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Effects of Resonance-Based Phase Shifters on Ka-Band Phased Array Antenna Performance for Satellite Communications
Progress In Electromagnetics Research B, 2014Co-Authors: Mehrbod Mohajer, Mohammadsadegh Faraji-dana, Safieddin Safavi-naeiniAbstract:Phase shifters are the key components of Phased array systems which provide a low-profile solution for Ka-band satellite communications. In the transmitting mode, it is crucial for the Phased array antenna system to meet the standard radiation masks, and any imperfections of Phase shifters can yield into radiation mask violation. In this paper, we present the analytical approach to model the non-linear Phase-Frequency characteristics of Resonance-Based Phase shifters, which constitute one of the most widely used class of Phase shifters for Ka-band satellite communications. Furthermore, it has been investigated how the Phase-Frequency Response non-linearity affects the Phased array radiation patterns, gain, and the beam pointing direction. The simulation results show that, depending on the Phase shifter Phase-Frequency Response profile, the radiation mask satisfaction is an important factor in determining the system bandwidth.
Magdy Tawfik Hanna - One of the best experts on this subject based on the ideXlab platform.
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ICASSP - A closed-form least squares solution to the discrete Frequency domain design problem of two-dimensional FIR filters
1995 International Conference on Acoustics Speech and Signal Processing, 1Co-Authors: Magdy Tawfik HannaAbstract:Based on a discrete Frequency domain formulation of the design problem of two-dimensional FIR filters, a closed form expression is derived for the matrix of filter coefficients without imposing any assumptions of having a symmetric, antisymmetric or zero-Phase Frequency Response. The matrix in question is derived by minimizing the Frobenius norm of the difference between the matrices of the actual and ideal Frequency Responses at the points of a Frequency grid. The method has the advantages of conceptual and computational simplicity.