A5025525864- Analog and Mixed-Signal Circuit Design
- Advancements in Semiconductor Devices and Circuit Design
- CCD and CMOS Imaging Sensors
- Radio Frequency Integrated Circuit Design
- Innovative Energy Harvesting Technologies
- Thin-Film Transistor Technologies
- Energy Harvesting in Wireless Networks
- Semiconductor materials and devices
- Low-power high-performance VLSI design
- Advancements in PLL and VCO Technologies
- Radiation Effects in Electronics
- Photovoltaic System Optimization Techniques
- Advanced DC-DC Converters
- Sensor Technology and Measurement Systems
- Particle Detector Development and Performance
- Advanced MEMS and NEMS Technologies
- Electromagnetic Compatibility and Noise Suppression
- VLSI and Analog Circuit Testing
- Radiation Detection and Scintillator Technologies
- Advanced Battery Technologies Research
- Integrated Circuits and Semiconductor Failure Analysis
- VLSI and FPGA Design Techniques
- Neural Networks and Applications
- Embedded Systems Design Techniques
- Silicon Carbide Semiconductor Technologies
Aristotle University of Thessaloniki
2014-2024
Democritus University of Thrace
2023
Technical University of Crete
2022
Politecnico di Milano
2022
University of Bremen
2022
University of California, Santa Barbara
2022
University of Patras
2022
Bridge University
2022
Özyeğin University
2022
Laboratoire d'Analyse et d'Architecture des Systèmes
1984
The integrated circuits employed for power management in photovoltaic (PV) energy harvesting applications are required to perform an efficient maximum point tracking (MPPT) process maximizing the production of PV source during continuously changing atmospheric conditions. Among alternative MPPT methods, perturbation and observation (P&O) technique has advantages operational implementation simplicity. In this article, a novel control system on-chip P&O method is presented, which, compared...
Epitaxial growth of GaAs/(Ca, Sr) F2/GaAs structures by means molecular beam epitaxy has been demonstrated. It shown that it was possible to grow layers with good crystalline quality and no noticeable interdiffusion at the interfaces. In addition, uppermost GaAs present interesting electrical properties, exhibiting electron Hall mobilities about 1300 cm2/Vs.
Epitaxial growth of monocrystalline layers mixed fluorides (CaxSr1−xF2) using molecular beams on GaAs substrates is reported for the first time. Good morphology and crystalline quality have been obtained. Some possible applications these structures are considered, preliminary results concerning electrical behavior metal-insulator-semiconductor devices use CaxSr1−xF2 as encapsulant or masking material GaAs.
The MOS transistor as a radiation dose detector has been presented. transistors present advantages such low cost, small volume and weight, robustness, accuracy, large measurable range, sensitivity to low-energy (10 keV). They are useful in real-time measurements or post-irradiation read-out, while they retain information after reading. of unbiased MOSFETs improved, further improvement is possible by increasing the oxide thickness via dual dielectrics using ion-implanted oxides stacked MOSFET...
The design process of an integrated bandpass filter targeted for the noise filtering stage synchronous demodulation unit electric field mill sensor interface is presented. purpose this study integration techniques to avoid challenging and, in some cases, impossible passive element and incorporate final entirely sensing system with superior performance optimized silicon-to-cost ratio. Four different CMOS implementations 0.18 μm XFAB, using OTA (Operational Transconductance Amplifier)-based...
A VLSI readout front-end architecture, dedicated for X-ray imaging, using specific capacitive silicon detectors, with capacitance ranging from 2 to 10 pF, is described. Critical design issues such as the noise optimization and shaper implementation technique are addressed first performance - test results of a fabricated prototype in 0.35-mum 3.3-V CMOS process, presented. Important feature novel CR RC <sup xmlns:mml="http://www.w3.org/1998/Math/MathML"...
In this brief, a very simple differential voltage attenuator based on floating-gate MOS transistors (FGMOS) is proposed. The constructed by only two stacked identical FGMOS in saturation region, provides output proportional to the difference of input voltages. advantages are low supply operation, rail-to-rail range with small linearity error and single-ended processing. A efficient technique transform any circuit that requires balanced inputs into counterpart attenuator, Using technique,...
A novel configuration, for the realisation of current conveyors in CMOS technology is proposed. The operation this circuit, which based on a high-gain differential closed loop structure, presented. Simulation results have shown remarkable performance characteristics, namely high-frequency bandwidth, accurate and linear operation, temperature insensitivity.
In this paper, we present voltage-mode and current-mode computational circuits using floating-gate MOS (FGMOS) transistors, operating in saturation region. The are designed two FGMOS basic-cells, each one formed by three transistors with common source. first basic cell is connected voltage mode, while the second configuration order to implement circuits, respectively. Using cells, current squarers, four-quadrant multipliers a square rooter designed. Mismatches distortion analysis for...
Water scarcity and desertification are considered to be among the greatest challenges of humanity over coming decades. Worldwide, agriculture accounts 69% total water usage, while industry for 23%, urban use 8%. In Greece, a rural development model poor farming practices have resulted in an overwhelming 83% consumption directed uses. Furthermore, excessive combined with existing pesticides fertilizers usage levels creates exponential problems cycle Greece. Taking into account above...
In this work, the integration of SmartPV technology (i.e., smart photovoltaic cell-level integrated inverters) in Zero Energy Building (ZEB) concept is proposed, context strict EU guidelines regarding transformation existing high energy consuming buildings into ZEBs, until 2030. ZEBs feature reduced demands, since most their needs are met by collective operation multiple Renewable Sources (RES). Moreover, economic impact self-consumption not negligible terms real economy, as they can...
A simple squarer based on floating-gate MOS transistors is presented. The has rail-to-rail input range with less than 0.5% non-linearity error. Using this single-ended and/or differential signals can be processed without additional circuitry. Also, a four quadrant analogue multiplier realised using the proposed squarer. Simulation results are given to verify theoretical analysis.
A low-voltage, low-noise, charge-sensitive preamplifier (CSA) for particle tracking using a silicon strip detector was designed. The optimised in terms of the total output noise performance minimisation technique based on MOSFET small signal equivalent circuit and readout front-end optimisation criteria valid strong inversion region. designed fabricated 0.35 µm CMOS process by Austria Mikro Systeme specific 2 pF capacitance X-ray spectroscopy. exhibits satisfactory compatible to low-energy...
An analog implementation of running min/max filters based on current-mode techniques is presented. Switched-current delay cells and current/voltage two inputs selectors are used either for current or voltage respectively. The input circuit designed using conveyors a modified structure this to implement the filter window size n=8. Simulation results demonstrate feasibility proposed implementation, which can be extended higher size.
A desired property of an autonomous system is the capability to operate and survive in unforeseen conditions. Wireless IoT (formerly Sensor Network) applications, pose a series limitations regarding embedded system's power consumption energy autonomy. The PERPS project proposes innovative approach harvesting systems, aiming perpetual operation WSN nodes portable electronics. state-of-the-art conversion integrated circuit (ENC IC), with real-time S/W algorithms implemented, allow predictive...
This paper focuses on the design of a low-voltage power converter for an on-chip PV cell-level inverter. Various topologies are discussed DC/DC stage, whereas ZVS quasi-resonant boost and synchronous considered most appropriate this application. Both aforementioned modeled evaluated in terms efficiency, by aid PSpice simulations. Due to requirements limitations available 0.18 μm CMOS process technology, is finally chosen as solution. As DC/AC H-bridge inverter configuration selected, simple,...
An interfacing circuit for piezoresistive pressure sensors based on CMOS current conveyors is presented. The main advantages of the proposed include use a single piezoresistor, capability offset compensation, and versatile current-mode configuration, with output or voltage input. Experimental tests confirm linear relation versus piezoresistance variation.
This paper proposes a simple CMOS exponential current circuit that is capable to control Variable Gain Amplifier with linear-in-dB manner. The proposed implementation based on Taylor's series approximation of the function. A VGA architecture has been designed in 90nm technology, order validate theoretical analysis. achieves 17dB linear range less than 0.5dB error, while overall power consumption 300μW.
A simple current-voltage model for polycrystalline silicon thin-film transistors (polysilicon TFTs) is proposed, including the sixth-order polynomial function coefficients fitted to effective mobility versus gate voltage data, channel length modulation, and impact ionization effects. The possesses continuity of current in transfer characteristics from weak strong inversion output throughout linear saturation regions operation. parameters are used as input AIM-SPICE circuit simulator device...
Novel CMOS current mode shapers for front-end electronics are proposed. In particular, six semi-Gaussian shaper implementations based on second generation conveyors and operational transconductance amplifiers designed using advanced filter design techniques. Although all architectures fully integrated, they satisfy a relatively large peaking time. The topologies analytically compared in terms of noise performance, power consumption, total harmonic distortion (THD), dynamic range (DR) order...