Paper Info
Title
Comparison of Direct Digitization Current Sensing Circuits for EIS
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 CTΣΔM 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 CTΣΔM, 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 CTΣΔM to achieve a higher SNR and linearity compared to the time-based converters.
Year
DOI
Venue
2019
10.1109/PRIME.2019.8787769
2019 15th Conference on Ph.D Research in Microelectronics and Electronics (PRIME)
Keywords
Field
DocType
direct digitization current sensing circuits,biomedical applications,direct digitization frontends,time-based converters,current conveyors,maximum input signal frequency,FIR-DAC,current recorders,SNR,EIS,current-input CTΣΔM frontends,time-based frontends,amplifier,clock jitter,low impedance node
Computer science,Linearity,Electronic engineering,Delta-sigma modulation,Converters,Electrical impedance,Jitter,Transistor,Electronic circuit,Amplifier
Conference
ISBN
Citations 
PageRank 
978-1-7281-3550-2
0
0.34
References 
Authors
5
3
Name
Order
Citations
PageRank
Mahdi Rajabzadeh122.41
Matthias Häberle201.69
Maurits Ortmanns3501114.46