Blar i USN Open Archive på forfatter "Azadmehr, Mehdi"
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Analysis of a Low Power Inverting CMOS Schmitt Trigger Operating in Weak Inversion
Nowbahari, Arian; Marchetti, Luca; Azadmehr, Mehdi (Peer reviewed; Journal article, 2022)This article analyzes the operation of a low power inverting CMOS Schmitt trigger in weak inversion. The analysis is based on an earlier proposed analytical model, which relates the hysteresis voltages to the transistors' ... -
Analysis of the effect of channel leakage on design, characterization and modelling of a high voltage pseudo-floating gate sensor-front-end
Marchetti, Luca; Berg, Yngvar; Azadmehr, Mehdi (Journal article; Peer reviewed, 2017)In this paper, we analyze the effects of channel leakage on the design, modelling and characterization of a high voltage pseudo-floating gate amplifier (PFGA) used as sensor front-end. Leakages are known as a major challenge ... -
Broadband Vibration-Based Energy Harvesting for Wireless Sensor Applications Using Frequency Upconversion
Li, Jinglun; Ouro-Koura, Habilou; Arnow, Hannah; Nowbahari, Arian; Galarza, Matthew; Obispo, Meg; Tong, Xing; Azadmehr, Mehdi; Halvorsen, Einar; Hella, Mona M.; Tichy, John A.; Borca-Tasciuc, Diana-Andra (Peer reviewed; Journal article, 2023)Silicon-based kinetic energy converters employing variable capacitors, also known as electrostatic vibration energy harvesters, hold promise as power sources for Internet of Things devices. However, for most wireless ... -
Design and fabrication of CMOS microstructures to locally synthesize carbon nanotubes for gas sensing
Roy, Avisek; Azadmehr, Mehdi; Ta, Bao Quoc; Häfliger, Philipp; Aasmundtveit, Knut (Peer reviewed; Journal article, 2019)Carbon nanotubes (CNTs) can be grown locally on custom-designed CMOS microstructures to use them as a sensing material for manufacturing low-cost gas sensors, where CMOS readout circuits are directly integrated. Such a ... -
Design and modelling of a bidirectional front-end for resonating sensors based on pseudo floating gate amplifier
Marchetti, Luca; Berg, Yngvar; Azadmehr, Mehdi (Journal article; Peer reviewed, 2017)In this paper, we characterize and model a bidirectional front-end based on pseudo-floating gate amplifier (PFGA) for actuation and read-out of resonating sensors. The basic idea consists of swapping the power supply of ... -
Design of a switchable driving coil for Magnetic Resonance Wireless Power Transfer
Zhaksylyk, Yelzhas; Hanke, Ulrik; Azadmehr, Mehdi (Chapter; Peer reviewed, 2019)This paper presents design and analysis of a switchable inductor suited for active impedance matching in magnetic resonance wireless power transfer systems. The switchable inductor is compact and can be used as both driving ... -
Direct Synthesis of Carbon Nanotubes in CMOS-Layout of Micro-heaters
Roy, Avisek; Azadmehr, Mehdi; Häfliger, Philipp; Ta, Bao Quoc; Aasmundtveit, Knut (Peer reviewed; Journal article, 2019)Direct integration of Carbon Nanotubes (CNTs) in CMOS is important for commercially manufacturing low-cost CNT-based sensors. In such compact sensors, CNTs would act as sensing element, and CMOS circuits would process ... -
Low power electronic interface for electrostatic energy harvesters
Phan, Tra Nguyen; Azadmehr, Mehdi; Le, Cuong Phu; Halvorsen, Einar (Journal article; Peer reviewed, 2015)This paper presents design and simulation of a power electronic interface circuit for MEMS electrostatic energy harvesters. The designed circuit is applicable to highly miniaturized electrostatic harvesters with small ... -
Nano-Power Monostable-Based Wake-Up Mechanism for Wireless Sensor Networks
Nowbahari, Arian; Marchetti, Luca; Azadmehr, Mehdi (Chapter, 2022)Wireless sensor networks (WSNs) generally consist of thousands of sensor nodes, each one supplied by a battery or harvested energy. To prolong the lifetime of wireless sensor networks, wake-up receivers (WuRxs) are typically ... -
An Oscillator-Based Wake-Up Receiver for Wireless Sensor Networks
Nowbahari, Arian; Marchetti, Luca; Azadmehr, Mehdi (Chapter, 2021)The Internet of Things (IoT) concept is mainly enabled by wireless sensor networks (WSNs), which are continuously gaining attention, due to their multidisciplinary applications. To enhance the WSNs energy efficiency, ... -
Subthreshold Modeling of a Tunable CMOS Schmitt Trigger
Nowbahari, Arian; Marchetti, Luca; Azadmehr, Mehdi (Journal article; Peer reviewed, 2023)In this article, the subthreshold characteristics of a tunable single input CMOS Schmitt trigger (ST) are modeled for the first time. The high-to-low and low-to-high hysteresis transition points are analytically determined ... -
An Ultra-Low Power Multivibrator-Based Wake-up Receiver for Wireless Sensor Networks
Nowbahari, Arian; Marchetti, Luca; Azadmehr, Mehdi (Chapter, 2021)In recent years wireless sensor networks (WSNs) have gained significant attention because of their implementation in many different fields. As the nodes in WSNs are typically battery-powered, their lifetime is mainly limited ... -
Weak Inversion Model of an Inverting CMOS Schmitt Trigger
Nowbahari, Arian; Marchetti, Luca; Azadmehr, Mehdi (Chapter, 2022)In this article the subthreshold characteristics of an inverting single input CMOS Schmitt trigger circuit are analyzed. Analytical expressions for the low-to-high and high-to-low hysteresis transition voltages are determined. ...