Papers by Said F. Al-Sarawi
IEEE Transactions on Industrial Informatics, 2017
Table of Contents List of contents ..
A varactor-tunable second-order bandpass frequency-selective surface (FSS) for microwave frequenc... more A varactor-tunable second-order bandpass frequency-selective surface (FSS) for microwave frequencies is presented in this article. The FSS is composed of three stacked metallic layers. The wire grid in each layer in combination with metallic vias provides the bias for the varactors. This configuration eliminates the need for a dedicated bias network for the varactors, and thus avoids undesirable responses associated with the added bias grid. An equivalent circuit model together with an analytical design method is provided to simplify the design procedure of the FSS. The performance of the proposed structure is experimentally validated in a parallel-plate waveguide setup. Measurements show that by changing the varactor capacitance from 0.12 to 0.38 pF, the center frequency of the filter is tuned from 5.2 to 3.7 GHz with a consistent fractional bandwidth of 9% and with an insertion loss between 3 and 6 dB.
—In this paper, a compact microfluidic biosensor is designed based on a complementary electric-LC... more —In this paper, a compact microfluidic biosensor is designed based on a complementary electric-LC resonator coupled with a microstrip line. It is shown that by flowing water-glucose solutions with different concentrations to the sensing area, the resonance property of the resonator is modified. This measurable change in the electromagnetic property is then used to quantify the glucose concentration. A prototype of the designed sensor is fabricated and tested to verify the biosensing concept.
—This article presents a design of tunable frequency-selective surface (FSS) with miniaturized el... more —This article presents a design of tunable frequency-selective surface (FSS) with miniaturized elements. The frequency response of this FSS can be tuned by loading varactor diodes in the unit cell. The varactors are biased with a bias network composed of via holes and wire grids. An equivalent circuit model is utilized in the design process. A second-order tunable FSS prototype is designed and simulated for verification of the tunability concept. Full-wave simulations show a 40% tuning range from 5.1 GHz to 3.4 GHz with an insertion loss between 0.7–5.2 dB within the passband.
—A varactor-tunable second-order bandpass frequency-selective surface (FSS) for microwave frequen... more —A varactor-tunable second-order bandpass frequency-selective surface (FSS) for microwave frequencies is presented in this article. The FSS is composed of three stacked metallic layers. The wire grid in each layer in combination with metallic vias provides the bias for the varactors. This configuration eliminates the need for a dedicated bias network for the varactors, and thus avoids undesirable responses associated with the added bias grid. An equivalent circuit model together with an analytical design method is provided to simplify the design procedure of the FSS. The performance of the proposed structure is experimentally validated in a parallel-plate waveguide setup. Measurements show that by changing the varactor capacitance from 0.12 to 0.38 pF, the center frequency of the filter is tuned from 5.2 to 3.7 GHz with a consistent fractional bandwidth of 9% and with an insertion loss between 3 and 6 dB.
Physical unclonable functions (PUFs) are increasingly used for authentication and identification ... more Physical unclonable functions (PUFs) are increasingly used for authentication and identification applications as well as the cryptographic key generation. An important feature of a PUF is the reliance on minute random variations in the fabricated hardware to derive a trusted random key. Currently, most PUF designs focus on exploiting process variations intrinsic to the CMOS technology. In recent years, progress in emerging nanoelectronic devices has demonstrated an increase in variation as a consequence of scaling down to the nanoregion. To date, emerging PUFs with nanotechnology have not been fully established, but they are expected to emerge. Initial research in this area aims to provide security primitives for emerging integrated circuits with nanotechnology. In this paper, we review emerging nanotechnology-based PUFs.
2015 IEEE 15th Mediterranean Microwave Symposium (MMS), 2015
2015 IEEE 15th Mediterranean Microwave Symposium (MMS), 2015
ICECS 2000. 7th IEEE International Conference on Electronics, Circuits and Systems (Cat. No.00EX445), 2000
This paper reviews the state-of-the-art in VLSI 3D packaging technology with a view to compact po... more This paper reviews the state-of-the-art in VLSI 3D packaging technology with a view to compact portable electronic systems. A number of bare dice and MGM stacking technologies are now emerging to meet the eúer increasing demands for low power consumption, low weight and compact portable systems. Technical issues such as silicon efficiency, complexity, thermal management, interconnection capacity, speed and power are shown to be critical in the choice of 3D stacking technology, depending on the target application.
Microelectronics Journal
The neuron-MOS (neu-MOS) transistor, recently discovered by Ohmi in 1991 [T. Shibata, T. Ohmi, In... more The neuron-MOS (neu-MOS) transistor, recently discovered by Ohmi in 1991 [T. Shibata, T. Ohmi, International Electron Devices Meeting, Technical Digest, 1991] uses capacitively coupled inputs onto a floating gate. Neu-MOS enables the design of conventional analog and digital integrated circuits with a significant reduction in transistor count [L.This paper extends the neu-MOS paradigm to complementary gallium arsenide based on HIGFET transistors. The design and HSPICE simulation results of a neu-GaAs ripple carry adder are presented, demonstrating the potential for very significant transistor count and area reduction through the use of neu-GaAs in VLSI design. Preliminary simulations indicate a reduction of a factor of four in transistor count for the same power dissipation as conventional complementary GaAs. The small gate leakage is shown to be useful in eliminating unwanted charge build-up on the floating gate. ᭧
Journal of Intelligent Material Systems and Structures
A multilayer piezoelectric actuator is a promising linear vibrator. In this article, a simple dis... more A multilayer piezoelectric actuator is a promising linear vibrator. In this article, a simple distributed-parameter analytical model of piezoelectric actuator, which can model vibration characteristics of piezoelectric actuator-based applications, is formulated. Based on the physical analysis of piezoelectric actuator, a simplification is proposed, justified and applied to fundamentals of thickness-extension-mode piezoelectricity. This simplification subtly enables piezoelectric actuator to be effectively modelled as a whole and allows for a formulation of a simple analytical model. Compared with other modelling methods in the literature, the proposed model with a small number of easily accessible parameters is easy to handle and extend with little compromised accuracy. The effectiveness of the proposed model has been validated by a threedimensional finite element analysis model of piezoelectric actuator developed in commercial software ANSYS.
Lecture Notes in Electrical Engineering, 2009
ABSTRACT
Lecture Notes Electrical Engineering, 2008
An integration of low power operated Surface Acoustic Wave (SAW) devices with the electrostatic m... more An integration of low power operated Surface Acoustic Wave (SAW) devices with the electrostatic microactuators for microfluidic and similar applications is presented in this chapter. Passive, low power, and small area devices can be interrogated wirelessly using SAW devices, which can respond to a uniquely coded signal for a secure and reliable operation. The novel approach relies on converting the interrogating coded signal to surface acoustic wave that is then correlated with an embedded code. A theoretical analysis of how the actuation mechanism operates is carried out and simulation results of the new microactuator are discussed. At the initial analytical stage, for simplicity, a basic SAW delay line structure is used to generate an electrostatic field between output interdigital transducer (IDT) of the SAW device and a thin conductive plate (actuator), which is placed on top of the output IDT. The static and transient displacement analysis of the actuator is carried out using ANSYS simulation tools. A comparison between the static displacements obtained from ANSYS based simulations and Rayleigh-Ritz based analysis is also presented and discussed.
IFIP — The International Federation for Information Processing, 2005
Micro-fabricated diaphragms can be used to provide pumping action in microvalve and microfluidic ... more Micro-fabricated diaphragms can be used to provide pumping action in microvalve and microfluidic applications. In this paper, a design for a micro-diaphragm that features low power and small area is presented. The diaphragm is actuated using a Surface Acoustic Wave (SAW) device that is interrogated from an RF signal to provide secure actuation operation. The micropump is targeted for in vivo nano-scale drug delivery and similar applications. For low power micropump operation, it is important to design the diaphragm with a higher flexibility while maintaining the stability. Analysis is carried out using ANSYS simulation tools with different design methods and materials. Results achieved from analytical and Finite Element Modeling (FEM) methods are compared and discussed to decide on optimal dimensions for the diaphragm.
2015 40th International Conference on Infrared, Millimeter, and Terahertz waves (IRMMW-THz), 2015
A second-order bandpass frequency selective surface (FSS) for terahertz applications is experimen... more A second-order bandpass frequency selective surface (FSS) for terahertz applications is experimentally demonstrated in this paper. The proposed FSS is designed using miniaturized element unit cells that enable analysis of their frequency by an equivalent circuit model. A transmission zero is introduced in the upper stopband of the transmission response for improving the out-of-band performance. Numerical and experimental results show a harmonic-free response up to three times the passband center frequency.
| The ability to carry out signal processing, classification, recognition, and computation in art... more | The ability to carry out signal processing, classification, recognition, and computation in artificial spiking neural networks (SNNs) is mediated by their synapses. In particular, through activity-dependent alteration of their efficacies, synapses play a fundamental role in learning. The mathematical prescriptions under which synapses modify their weights are termed synaptic plasticity rules. These learning rules can be based on abstract computational neuroscience models or on detailed biophysical ones. As these rules are being proposed and developed by experimental and computational neuroscientists, engineers strive to design and implement them in silicon and en masse in order to employ them in complex real-world applications. In this paper, we describe analog very large-scale integration (VLSI) circuit implementations of multiple synaptic plasticity rules, ranging from phenomenological ones (e.g., based on spike timing, mean firing rates, or both) to biophysically realistic ones (e.g., calcium-dependent models). We discuss the application domains, weaknesses, and strengths of various representative approaches proposed in the literature, and provide insight into the challenges that engineers face when designing and implementing synaptic plasticity rules in VLSI technology for utilizing them in real-world applications.
Uploads
Papers by Said F. Al-Sarawi