콘텐츠 본문
논문 해외 국제전문학술지(SCI급) A Low-Power Wide Dynamic-Range Current Readout Circuit for Ion-Sensitive FET Sensors
- 학술지 구분 국제전문학술지(SCI급)
- 게재년월 2017-06
- 저자명 Hyunwoo Son, Hwasuk Cho, Jahyun Koo, Youngwoo Ji, Byungsub Kim, Hong-June Park, Jae-Yoon Sim
- 학술지명 IEEE TRANSACTIONS ON BIOMEDICAL CIRCUITS AND SYSTEMS
- 발행처명 IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
- 발행국가 해외
- 논문언어 외국어
- 전체저자수 7
논문 초록 (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 mu m CMOS converts the current input with a range of 2.8 mu A to 15b digital output in about 4 ms, showing a DNL of + 0.24/ - 0.25 LSB and an INL of + 1.98/ - 1.98 LSB while consuming 16.8 mu W.
