i-manager's Journal on Electronics Engineering (JELE)


Volume 13 Issue 4 July - September 2023

Research Paper

A Procedure to Analyze Digital Circuits in CNTFET and CMOS Technology by ADS

Roberto Marani* , Anna Gina Perri**
* Institute of Intelligent Industrial Technologies and Systems for Advanced Manufacturing (STIIMA), National Research Council of Italy, Milan, Italy.
** Department of Electrical and Information Engineering, Polytechnic University of Bari, Italy.
Marani, R., and Perri, A. G. (2023). A Procedure to Analyze Digital Circuits in CNTFET and CMOS Technology by ADS. i-manager’s Journal on Electronics Engineering, 13(4), 1-9. https://doi.org/10.26634/jele.13.4.20048

Abstract

This paper proposes a procedure to analyze digital circuits in both Carbon Nanotube Field-Effect Transistors (CNTFET) and Complementary Metal-Oxide-Semiconductor (CMOS) technology for the purpose of comparison. The procedure is applied to study a NAND gate, with an emphasis on its applicability to analyze other digital circuits. To demonstrate this versatility, the procedure is also used to analyze a NOT gate in both CNTFET and CMOS technology. The paper presents the improvements achieved with CNTFET technology compared to CMOS. All simulations are conducted using the Advanced Design System (ADS) software, compatible with the Verilog-A programming language. Results from the analysis reveal that CNTFET technology exhibits superior performance, particularly at lower supply voltages. The paper also quantifies the differences in propagation delay, with CNTFET technology outperforming CMOS technology by a significant margin.

Research Paper

Design of Virtual Electrical Laboratories for Performing Steady State and Transient Response of R-L, R-C and R-L-C Circuit

Souptik Das* , Tirthankar Chakraborty**, Abantika Choudhary***, Sayan Paramanik****, Krishna Sarker*****, Koustuv Sarkar******
*-***,*****-****** Department of Electrical Engineering, St. Thomas' College of Engineering & Technology, West Bengal, India.
**** Department of Servicing, Statcon Electronics India Ltd, Uttar Pradesh, India.
Das, S., Chakraborty, T., Choudhary, A., Paramanik, S., Sarker, K., and Sarkar, K. (2023). Design of Virtual Electrical Laboratories for Performing Steady State and Transient Response of R-L, R-C and R-L-C Circuit. i-manager’s Journal on Electronics Engineering, 13(4), 10-25. https://doi.org/10.26634/jele.13.4.20069

Abstract

This paper delves into the concept of virtual electrical laboratories, offering a comprehensive exploration of their design and functionality. A user-centered perspective is employed to analyze existing limitations and underscore the critical need for improved usability in virtual lab design. The study proposes practical applications aimed at swiftly enhancing the efficacy of these virtual environments, focusing on experiments involving R-L-C, R-L, and R-C circuits for both steadystate and transient responses. Using JavaScript, Hypertext Markup Language (HTML), and Cascading Style Sheets (CSS), the paper introduces a validated methodology through real-time experiments conducted in the laboratory and on the proposed virtual lab platform. The versatility of this approach positions it as a viable solution for implementation in various domains, including electric machines, power systems, and circuit theory labs. In alignment with the growing trend of long-distance education, where students seek engagement in diverse experiments from their homes, this paper contributes to the evolution of virtual electrical laboratories.

Research Paper

Speech Enhancement for Noisy Signals using Adaptive Algorithms

Anna Rahul Kasukurthy* , Uma Sankar Chintala D.**
* Department of Electronics and Communication Engineering, Acharya Nagarjuna University, Guntur, Andhra Pradesh, India.
** Department of Electrical and Electronics Engineering, Acharya Nagarjuna University, Guntur, Andhra Pradesh, India.
Kasukurthy, A. R., and Chintala, D. U. S. (2023). Speech Enhancement for Noisy Signals using Adaptive Algorithms. i-manager’s Journal on Electronics Engineering, 13(4), 26-35. https://doi.org/10.26634/jele.13.4.20099

Abstract

Speech enhancement is a signal processing technique used to improve the quality and intelligibility of speech recordings that contain noise or interference. Its main goal is to eliminate unwanted background noise while preserving the clarity and naturalness of the speech signal. This paper provides a comprehensive analysis of three widely used adaptive filtering algorithms, Least Mean Square (LMS), Normalized Least Mean Square (NLMS), and Affine Projection Algorithm (APA). The limitations of LMS, such as slow convergence and sensitivity to input variations, are addressed in this study. By incorporating normalization, NLMS improves convergence speed and robustness to input power levels. The Affine Projection Algorithm (APA) is known for its exceptional performance in non-stationary environments, achieved through subspace projection to estimate optimal filter coefficients, resulting in faster convergence and improved tracking capabilities. In this paper, the algorithms are compared using Signal-to-Noise Ratio (SNR), Mean-Square Error (MSE), and Root-Mean-Square-Error (RMSE) values.

Research Paper

An Approach to Harmonic Optimization for 25KVA Auxiliary Converter used in Indian Railway

Shawanti Roy* , Sayan Paramanik**, Krishna Sarker***
*,*** Department of Electrical Engineering, St. Thomas' College of Engineering & Technology, West Bengal, India.
** Department of Servicing, Statcon Electronics India Ltd, Uttar Pradesh, India.
Roy, S., Paramanik, S., and Sarker, K. (2023). An Approach to Harmonic Optimization for 25KVA Auxiliary Converter used in Indian Railway. i-manager’s Journal on Electronics Engineering, 13(4), 36-47. https://doi.org/10.26634/jele.13.4.20155

Abstract

As the Indian railway network expands, the demand for reliable and efficient power systems, especially auxiliary converters supporting various on-board systems, grows. By reducing power losses and fuel consumption, it is more crucial to design an energy-efficient and economic auxiliary converter for the railway system. This is partially accomplished by using a 25KVA auxiliary (Aux.) converter, which can accept input electrical energy from a 110V DC battery at Self-Generation (SG) coaches. Biogeography Based Optimization (BBO) method of harmonic elimination for a 25KVA converter is described in this study. The paper explores the 120-degree mode of conduction and compares the existing technique with a proposed 7-switching selective odd harmonic removal method. Results from Matlab simulations demonstrate the effectiveness of the BBO technique in reducing Total Harmonic Distortion (THD). The output voltage waveforms with and without BBO are compared, showcasing a significant improvement in harmonic suppression. The paper concludes by emphasizing the practical implementation of the optimized switching angles using an ATmega2560R3 microcontroller. The online application of stored switching angles on the microcontroller is calculated offline.

Research Paper

A Novel Wearable Biosensor for Real-Time Alcohol Detection

Ushaa Eswaran* , Vishal Eswaran**, Keerthna Murali***, Vivek Eswaran****
* Principal & Professor, Department of ECE, Indira Institute of Technology and Sciences, Markapur, Andhra Pradesh, India.
** Senior Data Engineer, CVS Health Centre, Dallas, Texas, United States.
*** Site Reliability Engineer II, Dell Technologies, Austin, Texas, United States.
**** Senior Software Engineer, Tech Lead at Medallia, Austin, Texas, United States.
Eswaran, U., Eswaran, V., Murali, K., and Eswaran, V. (2023). A Novel Wearable Biosensor for Real-Time Alcohol Detection. i-manager’s Journal on Electronics Engineering, 13(4), 48-55. https://doi.org/10.26634/jele.13.4.20192

Abstract

Alcohol misuse has become a major public health concern worldwide. The development of an accurate, non-invasive, and cost-effective method for real-time alcohol detection would have important applications for monitoring and preventing alcohol misuse. This paper proposes a novel wearable biosensor for real-time alcohol detection in sweat. The biosensor uses alcohol oxidase immobilized on a screen-printed electrode to amperometrically detect ethanol in sweat samples. An artificial sweat solution was used to optimize the sensor design and evaluate its analytical performance. The optimized biosensor demonstrated a linear response to ethanol in the concentration range of 0.1–1.0 g/dL, with a limit of detection of 0.02 g/dL. On-body trials of the wearable biosensor provided rapid measurements that strongly correlated with blood alcohol content. This approach could offer a convenient solution for continuous, non-invasive alcohol monitoring to help reduce alcohol misuse and promote healthy behaviors. Further research on long-term use, alternate electrode geometries, and fully integrated wearable designs is warranted.