Title
A PLL-based eddy current displacement sensor for button applications
Author
Ferreira Pimenta, Matheus (TU Delft Electrical Engineering, Mathematics and Computer Science; TU Delft Electronic Instrumentation)
Contributor
Makinwa, Kofi (mentor)
Degree granting institution
Delft University of Technology
Programme
Electrical Engineering | Microelectronics
Date
2019-10-23
Abstract
This thesis presents an Eddy current sensor (ECS) for button readout applications. By employing a Phase-locked loop to perform a frequency readout, it was possible to significantly reduce the power consumption of the interface while achieving resolutions comparable to prior arts making it a more suitable solution for portable applications. The sensor achieves more than 12bit effective resolution, which translates into an equivalent displacement resolution in excess of 10nm RMS. The interface consumes less than 235µA from a 1.8V supply, achieving resolution similar to current state-of-the-art readout systems while consuming 20x less power.
Subject
Eddy current sensors
PLL
Frequency readout
Displacement sensor
To reference this document use:
http://resolver.tudelft.nl/uuid:0ff69090-9932-4b1d-8fbc-5832de1bdc02
Embargo date
2024-10-23
Part of collection
Student theses
Document type
master thesis
Rights
© 2019 Matheus Ferreira Pimenta