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We propose a THz spatial filter using frequency selective surfaces (FSS) integrated with bimaterial actuator for switching. The actuator consists of two materials that have different thermal expansion rates and can be designed based on temperature tuning. The goal for this design is to develop high performance reconfigurable filters operating in the THz band. The filter was fabricated using gold as...
In cognitive radio networks, cognitive users are allowed to use the licensed portions of spectrum, as long as no harmful interference affects the primary (licensed) users. Towards achieving this goal, spectrum sensing is an essential process to determine spectrum access opportunities for the cognitive users. In wide spectrum applications, it is recommended to distribute the sensing task of the required...
This paper presents general considerations for synthesis of hybrid feedforward control architectures for pulsewidth modulated (PWM) switching converters, where selected converter variables are sensed and utilized to determine the duty cycle to achieve a control objective based on the converter open-loop characteristics. Compared to standard feedback control techniques, advantages may include simpler...
High performance control of Switched Reluctance Machines (SRM) dictates the need for an accurate electromagnetic characterization which can be obtained either by analytical, finite elements (FE) or experimental methods. Physically SRM's present a double salient structure and are intended to operate in deep magnetic saturation in function of phase current and rotor position. As a result SRM's characteristics...
In sensor-node applications, the auxiliary power is drawn from the ac mains to supply the mixed-signal sensor components. There is therefore a need for low-cost, sub-1W, miniature non-isolated ac-dc down-converters. In this work, a new two-chip architecture is proposed to implement a high-voltage quasi-resonant buck converter with peak current-mode control. The current and voltage control loops are...
A non-volatile spintronic programmable logic (SPL), based on a 3-teriminal magnetic tunnel junction (MTJ), is presented and simulated using a compact device model. The SPL structure is compatible with CMOS technology and can be fabricated in the back end of line (BEOL). The proposed SPL exploits the gate-voltage-modulated spin Hall effect (V-SHE) switching, which combines the voltage controlled magnetic...
Since 1950s, the surface electromyographic signals are used by most of the electrically powered prostheses. These signals are collected from the skin surface and used indirectly as reference signals for the controller of the prostheses. Due to the nature of these signals it is impractical to feed these signals as inputs directly into the controller. The signals should be processed first, by segmentation,...
This paper describes a comparator capable of detecting mV-range input voltage signals reliably using sub-nW power consumption. The comparator uses a current-mirror-based positive feedback and hysteresis to generate the mV-range threshold. It has three new ideas: (1) to use the input signal to bias the current mirror, which only activates the current mirror when the input signal reaches a detectable...
The Internet of Things (IoT) became superior innovation area for nanoelectronic circuit design. This work is focused on a multi-modal power gating design approach for sensor node systems for IoT. Power gating is very efficient and flexible way for minimization of IoT CMOS circuits power consumption. However, only a very few papers suggesting multi-modal approach were published. Conventional power...
Read access in STT-MRAMs is well known to be highly sensitive to process variations. Such variations are responsible for read bit error rates that are worse than conventional CMOS memories (e.g., SRAM) by orders of magnitude, especially at low voltages. In this work we propose a boosted sensing scheme to improve the resiliency of STT-MRAM against variations in read accesses based on the voltage sensing...
The problem of co-design of controller and communication sequence is addressed for networked control systems (NCSs) where the capacities of communication networks at both sides of the system are limited so that the sensors and the actuators cannot be accommodated simultaneously. The co-design problem is solved in three steps: determining feasible communication sequence sets for both sides; building...
This paper investigates ISFET circuits operating in current mode and demonstrates linear pH-to-current operation. The two operating regions that provide linear gate-voltage to drain-current operation are the triode and velocity saturation regions which have been compared with a focus on pH sensing applications. Subsequently, two sensor arrays optimised for operation in each region are proposed with...
In this paper, a novel co-design scheme of TOD protocol and H∞ filter for the NCS subject to communication constraints is investigated. Firstly, the closed-loop NCS with network-induced imperfections is modeled as a discrete-time switched system with uncertain parameters. Then a sufficient condition is proposed for exponential stability of the NCS through using the average dwell time method of switched...
For search and rescue (SAR) missions in emergency and disaster scenarios, unmanned robotic technologies offer an opportunity to save human lives and speed up the rescue process. Communication among the unmanned devices and with the command and control station plays a key role in detecting, locating, and rescuing affected persons. To establish this communication network, ease of deployment provided...
A reliable and energy-efficient communication infrastructure plays an important role in the success of data collection, transmission and control in smart grid (SG) networks. In order to satisfy the coverage and cost minimization requirements, in this paper, we introduce cognitive radio (CR) into a residential SG network in which the communication load and the available spectrum resource change with...
Target Tracking issue in wireless sensor networks (WSNs) has gained much attention. Network lifetime and tracking accuracy are the important measurements for the target tracking mechanisms. However, most of approaches pursue one at the cost of the other. In some applications, the best tracking accuracy is not necessary to achieve if tracking quality is fixed by application users. This paper proposes...
A dual-hop cognitive (secondary) relaying system incorporating collaborative spectrum sensing to opportunistically switch between data transmission and energy harvesting is introduced. The secondary relays, first scan the wireless channel for a primary network activity, and then convey their reports to a secondary base station (SBS). Afterwards, the SBS, based on these reports and its own estimation,...
This article is concerned with the recent advantages in the design of lanthanide complexes as luminescent devices such as sensors and switches. Herein the fundamental concepts of how to produce lanthanide complexes that can have their luminescence properties manipulated by external sources is first discussed, followed by a review of selected examples from the recent literature.
In the field of Energy Harvesting, it has been demonstrated that, under the proper conditions, nonlinear configurations of the harvester can provide better performance, compared to linear resonant oscillators. In this paper preliminary results of investigation on a system for energy harvesting from wideband vibrations are shown. The harvester adopts a nonlinear snap-through-buckling (STB) configuration...
The problem of spectrum congestion is a big challenge for the researchers now a days. This problem can be solved by cognitive radio. With the help of cognitive radio, the spectrum which is not being used by any licensed user, at a particular time period, can be used by secondary or cognitive radio user, making more efficient spectrum utilization. This is done by spectrum sensing process. Among many...
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