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39 results on '"Roy, Sajib"'

3. Vaccination and Pandemic Control in Bangladesh: Post Vaccination COVID-19 Positive Cases among Health Care Providers

Author

Halim, Kazi Shafiqul, primary, Saha, Suchisree, additional, Parvin, Sayda Tanjina, additional, Afroz, Sharmin, additional, Roy, Sajib, additional, Sanwar, Tasnim, additional, Mitul, Md Mahmudul Hasan, additional, Ahmed, Nusrat, additional, Shakila, Afsana Zerin, additional, Saha, Puspita, additional, Tisha, Khadija Islam, additional, Mou, Anaya Nur, additional, Kabir, Humayoun, additional, Tabassum, Rezwana, additional, Pasha, Nadiya, additional, Munmun, Akeba, additional, Shafiq ur Rahman, Shaikh, additional, Akter, Shammi, additional, and Afroz, Most Sultana, additional

Published
2024
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11. High-temperature LTCC assembly and design of SiC BJT-based negative charge pump.

Author

Roy, Sajib, Faruque, Khandokar Asif, Abbasi, Affan, and Mantooth, Alan

Subjects
*ON-chip charge pumps, *TEST systems
Abstract

This paper describes the negative charge pump design in state-of-the-art SiC BJT technology along with its assembly on the LTCC module for extremely high-temperature applications. Kiln thermal oven is used to test the system at 500°C and evaluate the system's high-temperature performance. The charge pump design is separated into two sections: a diode-connected BJT charge pump and a cross-coupled RC oscillator. Commercially available NHT dielectric capacitors (390 pF) are used for both circuit sections. The designed LTCC module used DuPont™ 9k7 dielectric with gold metallization for routing traces. The oscillator output frequency varied from 35.7 kHz to 125 kHz across temperature for a fixed supply voltage of 11 V. [ABSTRACT FROM AUTHOR]

Published
2022
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16. Wireless Sensor Node Platform for In-Plant Stress Monitoring

Author

Abbasi, Affan, primary, Suggs, Marvin W., additional, Walz, Logan, additional, Mahar, Asma, additional, Hassan, Ayesha, additional, Murphree, Robert C., additional, Roy, Sajib, additional, Roberts, Trenton L., additional, Di, Jia, additional, and Mantooth, Alan, additional

Published
2020
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30. Understanding Sub-threshold source coupled logic for ultra-low power application

Author

Roy, Sajib and Nipun, Md. Murad Kabir

Subjects
FIR, slew rate, STSCL, Electrical engineering, electronics and photonics, CMOS-CVL, SCL, PDP, Elektroteknik, elektronik och fotonik, NCL, DFF
Abstract

This thesis work primarily focuses on the applicability of sub-threshold source coupled logic (STSCL) for building digital circuits and systems that run at very low voltage and promise to provide desirable performance with excellent energy savings. Sectors like bio-engineering and smart sensors require the energy consumption to be effectively very low for long battery life. Alongside meeting the ultra-low power specification, the system must also be reliable, robust, and perform well under harsh conditions. In this thesis work, logic gates are designed and analyzed, using STSCL. These gates are further used for implementation of digital subsystems in small-sized smart dust sensors which would operate at very low supply voltages and consume extremely low power. For understanding the performance of STSCL with respect to ultra-low power and energy; a seven-stage ring oscillator, a 4-by-4 array multiplier, a fifth-order FIR filter and finally a fifty-fifth-order FIR filter were designed. The subcircuits and systems have been simulated for different supply voltages, scaling down to 0.2 V, at different temperature values (-20oC and 70oC) in both 45 nm and 65 nm process technologies. The chosen architectures for the FIR filters and array multiplier were conventional and essentially taken from traditional CMOS-based designs. The simulated results are studied, analyzed and compared with same CMOS-based digital circuits. The results show on the advantage of STSCL-based digital systems over CMOS. Simulation results provide an energy consumption of 1.1388 nJ for a fifty-fifth-order FIR filter, at low temperatures (-20oC), using STSCL logic, which is comparatively less than for the corresponding CMOS logic implementation.

Published
2011

39. Design and Assembly of High-Temperature Signal Conditioning System on LTCC with Silicon Carbide CMOS Circuits

Author

Roy, Sajib

Subjects
sustainability, fabrication run, circuits, signal conditioning module, module design, Electrical and Electronics, Power and Energy, Signal Processing, Systems and Communications
Abstract

The objective of the work described in this dissertation paper is to develop a prototype electronic module on a low-temperature co-fired ceramic (LTCC) material. The electronic module would perform signal conditioning of sensor signals (thermocouples) operating under extreme conditions for applications like gas turbines to collect data on the health of the turbine blades during operation so that the turbines do not require shutdown for inspection to determine if maintenance is required. The collected data can indicate when such shutdowns, which cost $1M per day, should be scheduled and maintenance actually performed. The circuits for the signal conditioning system within the prototype module must survive the extreme temperature, pressure, and centrifugal force, or G-force, present in these settings. Multiple fabrication runs on different integrated silicon carbide (SiC) process technologies have been carried out to meet the system requirements. The key circuits described in this dissertation are - two-stage op amp topologies and voltage reference, which are designed and fabricated in a new SiC CMOS process. The SiC two-stage op amp with PFET differential input pair showed 48.9 dB of DC gain at 500oC. The voltage reference is the first in SiC CMOS technology to employ an op amp-based topology. The op amp circuit in the voltage reference is a two-stage with NFET differential input pair that uses the indirect compensation technique for the first time in the SiC CMOS process to provide 42.5 dB gain at 350oC. The designed prototype module implemented with these circuits was verified to provide signal conditioning and signal transmission at 300oC. The signal transmission circuit on the module was also verified to operate with a resonant inductive wireless power transfer method at a frequency of 11.8 MHz for the first time. A second prototype module was also developed with the previously fabricated 1.2 µm SiC CMOS process. The second module was successfully tested (with wired power supply) to operate at 440oC inside a probe-station and also verified for the first time to sustain signal transmission (34.65 MHz) capability inside a spin-rig at a rotational speed of 10,920 rpm. All designed modules have dimensions of (length) 68.5 mm by (width) 34.3 mm to conform to the physical size requirements of the gas turbine blade.

Published
2021

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