A Low-Power Wide Dynamic-Range Current Readout Circuit for Ion-Sensitive FET Sensors
SCIE
SCOPUS
- Title
- A Low-Power Wide Dynamic-Range Current Readout Circuit for Ion-Sensitive FET Sensors
- Authors
- Hyunwoo Son; Hwasuk Cho; Jahyun Koo; Youngwoo Ji; Byungsub Kim; Hong-June Park.; Jae-Yoon Sim
- Date Issued
- 2017-06
- Publisher
- Institute of Electrical and Electronics Engineers Inc.
- Abstract
- This paper presents an amplifier-less and digital-intensive current-to-digital converter for ion-sensitive FET sensors. Capacitance on the input node is utilized as a residue accumulator, and a clocked comparator is followed for quantization. Without any continuous-time feedback circuit, the converter performs a first-order noise shaping of the quantization error. In order to minimize static power consumption, the proposed circuit employs a single-ended current-steering digital-to-analog converter which flows only the same current as the input. By adopting a switching noise averaging algorithm, our dynamic element matching not only mitigates mismatch of current sources in the current-steering DAC, but also makes the effect of dynamic switching noise become an input-independent constant. The implemented circuit in 0.35 ��m CMOS converts the current input with a range of 2.8 �� A to 15 b digital output in about 4 ms, showing a DNL of +0.24/-0.25 LSB and an INL of +1.98/-1.98LSB while consuming 16.8 ��W. ? 2007-2012 IEEE.
- Keywords
- Capacitance; Continuous time systems; Low power electronics; Timing circuits; Current steering DAC; Current steering digital-to-analog converters; Digital converters; Dynamic element matching; Ion-sensitive fets; Quantization errors; Static power consumption; Wide dynamic range; Digital to analog conversion
- URI
- https://oasis.postech.ac.kr/handle/2014.oak/50790
- DOI
- 10.1109/TBCAS.2016.2643784
- ISSN
- 1932-4545
- Article Type
- Article
- Citation
- IEEE Transactions on Biomedical Circuits and Systems, vol. 11, no. 3, page. 523 - 533, 2017-06
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