ASIC System Design Considerations for Under-glass Fingerprint Sensors An investigation into system performance using capacitive technology

Examensarbete för masterexamen

Please use this identifier to cite or link to this item: https://hdl.handle.net/20.500.12380/255194
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Type: Examensarbete för masterexamen
Master Thesis
Title: ASIC System Design Considerations for Under-glass Fingerprint Sensors An investigation into system performance using capacitive technology
Authors: ARVIDSSON, JOHANNES
Söderström Olsson, Rasmus
Abstract: Placing a fingerprint sensor under thick glass puts heavy performance requirements on the mixed signal path in the ASIC that constitutes the sensor. This thesis will explore and explain different effects that can be observed when the distance between a finger and a capacitive sensor is increased. We will motivate why these effects are detrimental to performance and try to combat them with proposed system-level design changes. Fast-capture of fingerprint images have been used to characterize contrast over time; the time behavior of contrast could not be used to circumvent detrimental effects of using thick glass. Instead, focus has been placed on reducing noise using extensive multisampling, using a dynamic sample count based on finger movement, with positive results. A reduction in pixel noise power of approximately 50% compared to a currently used sensor design has been achieved within the same sampling time frame.
Keywords: Informations- och kommunikationsteknik;Data- och informationsvetenskap;Information & Communication Technology;Computer and Information Science
Issue Date: 2018
Publisher: Chalmers tekniska högskola / Institutionen för data- och informationsteknik (Chalmers)
Chalmers University of Technology / Department of Computer Science and Engineering (Chalmers)
URI: https://hdl.handle.net/20.500.12380/255194
Collection:Examensarbeten för masterexamen // Master Theses



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