Tunable fractional-order band-pass filter of order 2?

2019Ahmed O.I.Psychalinos C.Radwan A.G.Said L.A.Yassin H.M.

In this work, a novel implementation of a tunable fractional-order bandpass filter of order 2? is proposed. The transfer function of the presented filter is approximated using the second-order Continued Fraction Expansion (CFE) approximation technique. The filter transfer function is realized using the Inverse Follow the Leader Feedback (IFLF) structure. The Operational Transconductance Amplifiers (OTAs) are used to implement the filter circuit. Furthermore, the proposed filter is tunable by varying the value of only one bias current, which adjust the value of ?. The simulations are performed using Matlab and Cadence software with UMC 0.13? m CMOS technology. © 2019 IEEE.

Frational Order Inverse Filters Based on CCII Family

2019Khalil N.A.Radwan A.G.Said L.A.Soliman A.M.

This paper proposes two generalized topologies of fractional order inverse filters (FOIF). All possible realizations of each topology are investigated using the second generation current conveyor (CCII) family. Inverse fractional highpass (IFHPF), inverse fractional bandpass (IFBPF), and inverse fractional lowpass (IFLPF) filters are realized using the same topology based on the generalized admittances. Numerical and P-Spice simulation results are presented for selected cases to approve the theoretical findings. The fractional order parameters increase the design flexibility and controllability which is validated experimentally. © 2019 IEEE.

A Universal Fractional-Order Memelement Emulation Circuit

2019Fouda M.E.Khalil N.A.Radwan A.G.Said L.A.Soliman A.M.

This paper proposes a current-/voltage-controlled universal emulator that can realize any fractional-order memelements (FOME). The proposed emulator consists of second-generation current conveyors (CCII) block, two switches, and a multiplier/divider block. The first switch controls the emulator mode (voltage or current), while, the other controls the type of the emulated FOME. The influence of the fractional-order capacitor (FOC) on the pinched hysteresis loop (PHL) area, is discussed which increases the controllability on the double loop area and the working frequency range. Numerical and PSPICE simulations are presented for selected cases to prove the theoretical findings. © 2019 IEEE.

Toward Portable Bio-impedance devices

2019AboBakr A.Elwakil A.S.Madian A.H.Mohsen M.Radwan A.G.Said L.A.

Bio-impedance measurement has been used as an indicator for specific physical and chemical changes in food products, fruits and vegetables, cancer detection and other applications. In this paper, a portable wireless bio-impedance measurement embedded system, based on the AD5933 chip, is introduced. The system is calibrated using a parallel RC network and the industry standard electrochemical station BioLogic SP-150. The module can be used in many impedance measuring applications. © 2019 IEEE.

A Simple BJT Inverse Memristor Emulator and Its Application in Chaotic Oscillators

2019Khalil N.A.Radwan A.G.Said L.A.Soliman A.M.

A generalized inverse memristor emulator is proposed based on two BJT transistors as a diode connected with a first order parallel RC filter. The mathematical model of the circuit is presented where the pinched hysteresis loops (PHLs) with different periodic stimuli are analyzed. The numerical, P-Spice simulations and experimental results are presented indicating that the introduced emulator is a simple voltage-controlled generalized inverse memristor. The results show that the PHLs area is increased with increasing the applied frequency. In addition, the proposed emulator is employed in a simple chaotic circuit. The effect of the inductor’s values on the chaotic system is investigated and the P-Spice simulations are performed to approve the numerical results. © 2019 IEEE.