Performance Comparison of GaAs/Si3N4 Based Cylindrical Gate-All-Around FETs under sub-20nm Channel Lengths

2026-03-24T11:49:52+00:00

This study explores the potential of gallium arsenide (GaAs) as a channel material and silicon nitride (Si₃N₄) as the oxide material for cylindrical gate-all-around field-effect transistors (CGAA-FETs) for sub-20 nm channel lengths. The investigated CGAA FET has been designed and implemented in the Silvaco TCAD simulation framework using the ATLAS tool. The modelling of the FET includes quantum effects, non-equilibrium Green’s function formalism, as well as well-known physical models such as Schottky-Read-Hall and Auger recombination, field and concentration dependent mobility models and Fermi statistics for accuracy. Simulations demonstrate that GaAs-based CGAA-FETs can effectively mitigate short-channel effects (SCEs) even at sub-14 nm technology nodes. The superior material properties of GaAs, such as optimised band-gap, higher electron mobility and electron affinity, higher permittivity of Si₃N₄, and improved gate control of CGAA FET structure, contribute to reducing SCEs and improving the performance. These findings suggest that GaAs-based CGAA-FETs offer a promising solution for developing high-performance, SCE-free transistors for next-generation electronic devices.

Dynamic Speed Regulation and Performance Evaluation of a DC Motor using Pulse Width Modulation (PWM) Control

2026-04-23T11:17:50+00:00

This paper presents an experimental and analytical study of DC motor speed control using Pulse Width Modulation (PWM). Direct Current (DC) motors are extensively employed in industrial and automation systems because they provide superior speed control and operational flexibility. As modern industries increasingly demand higher efficiency and reduced energy consumption, effective motor speed regulation has become a critical requirement for improving overall system performance. In this context, this research explores the speed control of a DC motor through the implementation of the PWM technique, which is widely recognised for its accuracy and efficiency in power control applications. PWM operates by adjusting the duty cycle of a switching signal; consequently, the average voltage supplied to the motor can be regulated without significant power loss. By varying the duty cycle, the motor receives different effective voltage levels, and therefore its rotational speed can be controlled precisely. In this study, the behaviour and performance of a DC motor are examined under multiple duty cycle conditions ranging from 20% to 100%, enabling a comprehensive evaluation of the relationship between duty cycle variation and motor speed. Both experimental observations and simulation results indicate that the motor speed increases proportionally with the duty cycle, while the system continues to maintain efficient power utilisation and stable operation. Furthermore, the findings demonstrate that PWM-based control not only enhances speed regulation accuracy but also improves energy efficiency and system reliability. Consequently, PWM emerges as a highly effective and flexible technique for DC motor speed control, making it particularly suitable for modern industrial and automation applications.

International Journal of Digital Electronics and Microprocessor Technology

Performance Comparison of GaAs/Si3N4 Based Cylindrical Gate-All-Around FETs under sub-20nm Channel Lengths

Dynamic Speed Regulation and Performance Evaluation of a DC Motor using Pulse Width Modulation (PWM) Control