Abstract
This paper presents a novel rail-to-rail Class-AB operational amplifier tailored for wake-up systems in motion sensor applications. By addressing limitations in free Class-AB designs, such as large inrush current, unstable bias conditions, and area ineffiiency, the proposed design achieves a gain of 59 dB and unity gain frequency of 550 kHz driving a 5 pF load. The inrush current is reduced from 1 mA to 7 µA, increasing the battery life. The layout area is reduced by 53% compared to the free Class-AB design, making it highly suitable for compact implementations. Operating at a low power consumption of 2 µW with a 1.8 V supply, the amplifier achieves a Signal-to-Noise-and-Distortion Ratio (SNDR) of 22 dB. These advancements demonstrate the potential of the design for energy-efficient analog front-end solutions in IoT and portable systems.
Original language | English |
---|---|
Article number | 316 |
Journal | Sensors |
Volume | 25 |
Issue number | 2 |
DOIs | |
State | Published - Jan 2025 |
Bibliographical note
Publisher Copyright:© 2025 by the author.
Keywords
- Class-AB operational amplifier
- Internet of things (IoT)
- electronic sensors
- energy-efficient circuits
- energy-efficient sensors
- low-power design
- rail-to-rail
ASJC Scopus subject areas
- Analytical Chemistry
- Information Systems
- Atomic and Molecular Physics, and Optics
- Biochemistry
- Instrumentation
- Electrical and Electronic Engineering