Publication:
Simulation on ultra low power amplifier for wearable and implantable electronic device

Loading...
Thumbnail Image
Date
2024-07
Authors
Bong, Wei Khang
Journal Title
Journal ISSN
Volume Title
Publisher
Research Projects
Organizational Units
Journal Issue
Abstract
This thesis focusses on the design and simulation of ultra-low power amplifiers for wearable and implantable electronic devices, in particular, the ransimpedance Amplifiers that are designed for bio-sensing applications. The primary objective is to design a Transimpedance Amplifier that has an input current of 100nA and power consumption less than 139µW. The second objective is to design a Transimpedance Amplifier that will ensure an input-referred noise current less than 100fA/√Hz with a gain bandwidth higher than 130MHz. The milestone reached in this work, though limited by the Process Design Kit availed by the SilTerra 180nm technology library, remains very prominent. The TIA that has been designed consumes only 125.1 µW of power for an input current of 100 nA and has shown a very impressive transimpedance gain of 127.958 dBΩ with a gain bandwidth of 159 MHz. The results show that in this process, it can reduce an input referred noise current as low as 84.5378 fA/√Hz at 10 Hz, hence proving its very high sensitivity for bio-sensing applications. The challenges identified by the research include the fact that the gm/Id methodology is not effective with the SilTerra 180nm technology library. In the final view, in spite of these, performance metrics remain competitive for this study compared to the existing literature available on power efficiency and noise performance. The conclusion that comes out from this study is that ultra-low power amplifiers can be designed for biomedical applications, thus proving the utility of the adopted approach and showing its potential for real applications. Future work may be dedicated to further compensation techniques aiming at ensuring stability, increasing the transimpedance gain through circuit configurations, exploiting advanced technology nodes smaller than 180nm, implementing physical layout designs, running aging simulations, and finally, targeting other circuit topologies. The present research thus looks toward contributing finally some important insight into design constraints and performance trade-offs of ultra-low power amplifiers, opening further ways to more innovations in wearable and implantable electronic devices.
Description
Keywords
Citation