A highly sensitive wide-range weak current detection circuit for implantable glucose monitoring

IEICE Electronics Express

Xiao Yan¹  Junyu Wang¹  Xi Tan¹  Sizheng Chen¹  Hao Min¹  Yibo Fan¹ 

[1] State Key Lab of ASIC & Systems, Fudan University

关键词: implantable;    weak current measurement;    SAR ADC;    correlated double sampling;   

DOI  :  10.1587/elex.13.20150616

学科分类：电子、光学、磁材料

来源: Denshi Jouhou Tsuushin Gakkai

【 摘 要 】

References(12)A highly sensitive weak current detection circuit for implantable glucose monitoring is presented. The circuit consists of a current splitter, an integrator, a sampling/holding (S/H) circuit, and an 8-bit successive approximation register (SAR) analog-to-digital convertor (ADC). T-switches, source voltage shifting and correlated double sampling (CDS) technology are adopted to reduce the effects of leakage currents, charge injection, dc offset and low-frequency 1/f noise. The work range is divided into 5 sub-ranges to reduce the complexity and power consumption of current detection. The chip was fabricated with 0.13 µm CMOS technology. Test results show that the circuit can detect weak signal from 10 fA to 1 nA with 1.5 V supply and 7.2 µW power consumption. The tested leakage current of the design is 4 fA.

【 授权许可】

Unknown