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Your search keyword '"Samad Sheikhaei"' showing total 7 results
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7 results on '"Samad Sheikhaei"'

1. Design and implementation of a novel zero‐current switching method for low‐power DC–DC converters

Author

Arya Hosseini, Samad Sheikhaei, and Masoud Davari

Subjects
controllers, DC‐DC converters, Zero‐current switching, Electronics, TK7800-8360
Abstract

Abstract This paper introduces a unique zero‐current switching (ZCS) technique for low‐power dc–dc converters. In this paper, a single‐inductor dual‐input triple‐output converter is considered to apply this new technique, which can be generalized for converters with more inputs and outputs and high‐power and energy‐harvesting applications. The first input of this converter can be connected to any source that can produce energy, such as photovoltaic (PV) cells or thermoelectric generator (TEG), and the second input can be considered a battery. The proposed converter is implemented discretely, and a low‐power microcontroller whose power consumption is reduced by the software is employed to control the whole system. In the proposed ZCS method, the current sensor is not used, and only a simple voltage level detector is employed to detect the inductor voltage level in order to determine the optimal value of the inductor discharge duty cycle. This converter works in discontinuous conduction mode (DCM) and uses pulse width modulation (PWM) and the time‐multiplexing strategy (TMS). The main focus of this paper is on designing and implementing a digital control algorithm based on this new ZCS technique in order to increase efficiency.

Published
2023
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3. A fast settling frequency synthesizer with switched‐bandwidth loop filter

Author

Alireza Ghobadi Rad, Farhad Beiraghdar, Samad Sheikhaei, and Massoud Tohidian

Subjects
Frequency synthesizer, Dynamic bandwidth allocation, Settling, Computer science, Applied Mathematics, Phase noise, Electronic engineering, Bandwidth (computing), Electrical and Electronic Engineering, Loop filter, Computer Science Applications, Electronic, Optical and Magnetic Materials
Published
2021

4. A low‐power, low‐data‐rate efficient ADC with hybrid exponential‐linear transfer curve for bio‐potential recording systems

Author

Mehdi Saberi, Maryam Gharaei Jomehei, and Samad Sheikhaei

Subjects
Materials science, Applied Mathematics, Analog-to-digital converter, Bio potential, Computer Science Applications, Electronic, Optical and Magnetic Materials, Exponential function, law.invention, Power (physics), law, Transfer (computing), Low data rate, Electronic engineering, Electrical and Electronic Engineering
Published
2020

5. Nanoantenna arrays as diode‐less rectifiers for energy harvesting in mid‐infrared band

Author

Samad Sheikhaei, A. Chekini, and Mohammad Neshat

Subjects
Materials science, business.industry, Mid infrared, 020206 networking & telecommunications, 02 engineering and technology, 021001 nanoscience & nanotechnology, Condensed Matter Physics, Atomic and Molecular Physics, and Optics, Electronic, Optical and Magnetic Materials, Field electron emission, 0202 electrical engineering, electronic engineering, information engineering, Optoelectronics, Electrical and Electronic Engineering, 0210 nano-technology, business, Energy harvesting, Diode
Published
2018

6. Multiband plasmonic nanoantenna structure for infrared energy harvesting based on electron field emission rectification

Author

Mohammad Neshat, A. Chekini, and Samad Sheikhaei

Subjects
Materials science, Infrared, business.industry, 020206 networking & telecommunications, 02 engineering and technology, Condensed Matter Physics, Atomic and Molecular Physics, and Optics, Electronic, Optical and Magnetic Materials, Field electron emission, 020210 optoelectronics & photonics, Rectification, 0202 electrical engineering, electronic engineering, information engineering, Optoelectronics, Electrical and Electronic Engineering, business, Energy harvesting, Plasmon
Published
2017

7. A 0.8-V supply bulk-driven operational transconductance amplifier and Gm-C filter in 0.18 µm CMOS process

Author

Samad Sheikhaei, Soolmaz Abbasalizadeh, and Behjat Forouzandeh

Subjects
Engineering, Voltage-controlled filter, Variable-gain amplifier, Total harmonic distortion, business.industry, Applied Mathematics, Transconductance, Electrical engineering, Computer Science Applications, Electronic, Optical and Magnetic Materials, Filter (video), Operational transconductance amplifier, Electronic engineering, Electrical and Electronic Engineering, business, Active filter, All-pass filter
Abstract

Summary A low voltage bulk-driven operational transconductance amplifier (OTA) and its application to implement a tunable Gm-C filter are presented. The linearity of the proposed OTA is achieved by nonlinear terms cancelation technique, using two paralleled differential topologies with opposite signs in the third-order harmonic distortion term of the differential output current. The proposed OTA uses 0.8 V supply voltage and consumes 31.2 μW. The proposed OTA shows a total harmonic distortion of better than −40 dB over the tuning range of the transconductance, by applying 800 mVppd sine wave input signal with 1 MHz frequency. The OTA has been used to implement a third-order low-pass Gm-C filter, which can be used for wireless sensor network applications. The filter can operate as the channel select filter and variable gain amplifier, simultaneously. The gain of the filter can be tuned from −1 to 23 dB, which results in power consumptions of 187.2 to 450.6 μW, respectively. The proposed OTA and filter have been simulated in a 0.18 µm CMOS technology. Simulations of process corners and temperature variations are also included in the paper. Copyright © 2014 John Wiley & Sons, Ltd.

Published
2014

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