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All Journal Bulletin of Electrical Engineering and Informatics Indonesian Journal of Electrical Engineering and Computer Science
Warsuzarina Mat Jubadi
Universiti Tun Hussein Onn Malaysia
Electrical & Electronics Engineering

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Comparative study of symmetrical OTA performance in 180 nm, 130 nm and 90 nm CMOS technology Wan Mohammad Ehsan Aiman bin Wan Jusoh; Siti Hawa Ruslan; Nabihah Ahmad; Warsuzarina Mat Jubadi; Rahmat Sanudin
Indonesian Journal of Electrical Engineering and Computer Science Vol 14, No 1: April 2019
Publisher : Institute of Advanced Engineering and Science

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.11591/ijeecs.v14.i1.pp230-240

Abstract

In this paper, the comparative study of symmetrical Operational Transconductance Amplifier (OTA) performance between 180 nm, 130 nm and 90 nm CMOS technology have been done thoroughly to find the relationship between voltage supply and bias current with performance parameters (gain, power consumption and Common-Mode Rejection Ratio (CMRR)). The OTA which adopts symmetrical topology is designed carefully and simulated using Synopsys HSpice software and the results are carefully analyzed and compared. The symmetrical OTA designed in 90 nm CMOS technology is found to be the best because the power consumed is only 9.83 µW from ±0.9 V voltage supply and the OTA achieved 55.9 dB of the DC gain. The CMRR of the symmetrical 90 nm OTA is 140 dB which is sufficient to reject the common-mode signals in electrocardiogram (ECG) input signal. The symmetrical 90 nm OTA is suitable to be implemented as bioamplifier in ECG signal detection system as it consumed low power and has a high CMRR characteristic.
Wireless charging and monitoring system utilizing internet of things technology for electric vehicle application Prabakaran A/L Kalaihrasan; Nurfarina Zainal; Nor Hafizah Ngajikin; Syarfa’ Zahirah Sapuan; Warsuzarina Mat Jubadi; Hing Wah Lee
Bulletin of Electrical Engineering and Informatics Vol 14, No 4: August 2025
Publisher : Institute of Advanced Engineering and Science

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.11591/eei.v14i4.8630

Abstract

Internal combustion engine (ICE) vehicles are major contributors to climate change and pollution, driving the transition to electric vehicles (EVs) as a cleaner alternative. However, EVs encounter challenges with charging infrastructure, notably the need for physical cables and issues with alignment for efficient charging. To address these problems, a wireless EV charging system has been developed using internet of things (IoT) technology for real-time monitoring and control. This system incorporates ESP32 and ESP8266 microcontrollers, infrared sensors, inductive coils, an OLED display, an ESP32-CAM module, relay modules, an AC to DC converter, a TP4056 charging module, a DC voltage sensor, and lithium-ion batteries. It employs a 20-turn coil for inductive coupled wireless power transfer (WPT), enabling the full charging of two lithium-ion batteries within 60 minutes. The system can detect an EV's presence, display battery status on an OLED screen, and provide real-time images of the vehicle's position through the SWEVCS mobile app. Infrared sensors ensure proper and precise alignment for effective charging. This advanced wireless charging solution enhances EV charging efficiency and convenience while supporting a more sustainable energy approach.
Co-Authors Hing Wah Lee Nabihah Ahmad Nor Hafizah Ngajikin Nurfarina Zainal Prabakaran A/L Kalaihrasan Rahmat Sanudin Siti Hawa Ruslan Syarfa’ Zahirah Sapuan Wan Mohammad Ehsan Aiman bin Wan Jusoh