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Comparison of direct digitization current sensing circuits for EIS

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PRIME2019.pdf (358.1Kb)
Erstveröffentlichung
2019-08-05
DOI
10.18725/OPARU-22388
Beitrag zu einer Konferenz


Authors
Rajabzadeh, Mahdi
Häberle, Matthias
Ortmanns, Maurits
Faculties
Fakultät für Ingenieurwissenschaften, Informatik und Psychologie
Institutions
Institut für Mikroelektronik
Published in
2019 15th Conference on Ph.D Research in Microelectronics and Electronics (PRIME) ; 2019 (2019). - S. 117-120. - ISBN 978-1-7281-3549-6, ISBN 978-1-7281-3550-2
Link to original publication
https://dx.doi.org/10.1109/PRIME.2019.8787769
Peer review
ja
Document version
acceptedVersion
Conference
15th Conference on Ph. D Research in Microelectronics and Electronics (PRIME), 2019-07-15 - 2019-07-18, Lausanne, Switzerland
License
Standard
https://oparu.uni-ulm.de/xmlui/license_v3
Abstract
In this work, a qualitative comparison between state of the art current recorders for biomedical applications is presented. Prior work showed that direct digitizing frontends outweight their analog counterparts. This work performs a comparison between the direct digitization frontends, namely time-based and current-input CTSDM frontends. It is shown that time-based converters - due to usage of current conveyors to generate a low impedance node - suffer from inferior linearity. Also the trade-off between SNR versus conversion time limits their achievable SNR and the maximum input signal frequency. On the other hand, with the usage of a FIR-DAC within a current input CTSDM, the requirements of the critical first amplifier are highly relaxed. In addition, the FIR-DAC reduces the influence of clock jitter and allows the current-input CTSDM to achieve a higher SNR and linearity compared to the time-based converters.
Funding information
GRK 2203: Micro- and nano-scale sensor technologies for the lung / DFG [278012962]
Subject Headings
Sigma-Delta-Wandler [GND]
Digitalisierung [GND]
Electric current converters [LCSH]
Modulators (Electronics) [LCSH]
Keywords
Current readout; Sigma delta modulator,; Direct digitization; Current-input CTSDM; FIR-DAC
Dewey Decimal Group
DDC 620 / Engineering & allied operations

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Rajabzadeh, Mahdi; Häberle, Matthias; Ortmanns, Maurits (2019): Comparison of direct digitization current sensing circuits for EIS. Open Access Repositorium der Universität Ulm. http://dx.doi.org/10.18725/OPARU-22388

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