
Sally AhmedKing Abdullah University of Science and Technology | KAUST · Department of Electrical Engineering
Sally Ahmed
Doctor of Philosophy
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29
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Publications
Publications (29)
Computational power density and interconnection between transistors have grown to be the dominant challenges for the continued scaling of complementary metal–oxide–semiconductor (CMOS) technology due to limited integration density and computing power. Herein, we designed a novel, hardware-efficient, interconnect-free microelectromechanical 7:3 comp...
In this work, we present the design and experimental demonstration of the first micro-resonator-based tunable hysteresis comparator. The proposed design employs an electrostatically driven clamped-clamped microbeam operated in the nonlinear regime. The design operation is assigned such that both the resonator’s drive frequency and beam bias can be...
Microresonator-based temperature sensors offer stable and high-resolution temperature detection. However, typical temperature-sensing techniques based on resonators suffer from design complexity and low sensitivity. In this study, we present a simple high-sensitivity temperature sensor that comprises a sealed electrostatically actuated clamped-clam...
In this paper, an analytical model of a micro-electromechanical (MEM) resonator used as a 4-bit digital-to-analog converter (DAC) is presented. First, we derive the dynamic equation of the 4-bit DAC device, and the nonlinear governing equation is solved by the Galerkin method combined with a shooting technique to simulate the static response, linea...
We present a novel design of a low-power micro-electro-mechanical digital to analog converter (DAC) based on a clamped-clamped micro-beam resonator with multiple split electrodes and capacitive airgaps of various widths. The proposed n-bit DAC device operates at a single drive frequency and can access one of 2^n distinct stable states based on the...
In this work, we present a reprogrammable micro-resonator logic gate designed with an industrial standard process. The device operation is based on altering the resonance frequency of the beam using DC digital inputs. The proposed design methodology reduces design complexity by 4 to 10 times compared to traditional CMOS design techniques and has gr...
In this work, the design principles and experimental demonstration of a compact full adder along with a reprogrammable 4 input logic gate are presented. The proposed solution for implementation of digital circuits is based on a clamped-clamped micro-beam resonator with multiple split electrodes, in which the logic inputs tune the resonance frequenc...
Micro/nano-electromechanical resonator-based logic elements have emerged recently as an attractive potential alternative to semiconductor electronics. The next step for this technology platform to make it into practical applications and to build complex computing operations beyond the fundamental logic gates is to develop cascadable logic units. Su...
Micro/nano-electromechanical resonator-based logic elements have revitalized the notion of mechanical computing as a potential alternative to surpass the limitations of semiconductor electronics. A vital step forward for this technology is to develop a platform for cascadable logic units that communicate among each other executable signals of the s...
We demonstrate logic and memory elements based on an in-plane clamped-clamped microbeam resonator. The micro-resonator is electrostatically actuated through a drive electrode and the motional signal is capacitively sensed at a sense electrode, while the resonance characteristics are modulated by DC voltage pulses provided at two separate partial el...
In today's digital age, the increasing dependence on information also makes us vulnerable to potential invasion of privacy and cyber security. Consider a scenario in which a hard drive is stolen, lost, or misplaced, which contains secured and valuable information. In such a case, it is important to have the ability to remotely destroy the sensitive...
We report short circuit current (JSC) enhancement in crystalline silicon (C-Si) photovoltaic (PV) using low-cost Ohmic contact engineering by integration of Nickel mono-silicide (NiSi) for back contact metallization as an alternative to the status quo of using expensive screen printed silver (Ag). We show 2.6 mA/cm2 enhancement in the short circuit...
Wearable electronics need miniaturized, safe, and flexible power sources. Lithium-ion battery is a strong candidate as high performance flexible battery. The development of flexible materials for battery electrodes suffers from the limited material choices. In this paper, we present integration strategy to rationally design materials and processes...
Crystalline silicon (C-Si) photovoltaics dominates the market share as one of the primary clean energy sources due to its low-cost and high-efficiency. Further development is needed to enhance the power density/cost. The primary metallization technology utilizes the expensive screen printed silver which costs nearly 40% of the total average cost of...
Miniaturization of sensors and electronic devices demands their integration with power sources of comparable sizes to feed them with power. Thin film rechargeable microbatteries can be used to deliver small-scaled power and low current levels for various devices such as portable electronics and micro elecrto mechanical systems (MEMS). Many recharge...
With the emergence of cloud computation, we are facing the rising waves of big data. It is our time to leverage such opportunity by increasing data usage both by man and machine. We need ultra-mobile computation with high data processing speed, ultra-large memory, energy efficiency and multi-functionality. Additionally, we have to deploy energy-eff...
We report fabrication of MEMS thermal actuators on flexible and semi-transparent silicon fabric released from bulk silicon (100). We fabricated the devices first and then released the top portion of the silicon (≈ 19 μm) which is flexible and semi-transparent. We also performed chemical mechanical polishing to reuse the remaining wafer. A tested th...
This paper reports a generic process flow to fabricate mechanically flexible and optically semi-transparent thermoelectric generators (TEGs), micro lithium-ion batteries (μLIB) and metal-oxide-semiconductor capacitors (MOSCAPs) on mono-crystalline silicon fabric platforms from standard bulk silicon (100) wafers. All the fabricated devices show outs...