摘要
This paper reports a complimentary metal-oxide-semiconductor （CMOS） analog front-end chip for amperometric electrochemical sensors. The chip includes a digital configuration circuit, which can communicate with an external microcontroller by employing an I^2C interface bus, and thus is highly programmable. Digital correlative double samples technique and an incremental sigma-delta analog to digital converter （∑-△ ADC） are employed to achieve a new proposed system architecture with double samples. The chip has been fabricated in a standard 0.18-μm CMOS process with high-precision and high-linearity performance occupying an area of 1.3 × 1.9 mm^2. Sample solutions with various phosphate concentrations have been detected with a step concentration of 0.01 mg/L.
This paper reports a complimentary metal-oxide-semiconductor （CMOS） analog front-end chip for amperometric electrochemical sensors. The chip includes a digital configuration circuit, which can communicate with an external microcontroller by employing an I^2C interface bus, and thus is highly programmable. Digital correlative double samples technique and an incremental sigma-delta analog to digital converter （∑-△ ADC） are employed to achieve a new proposed system architecture with double samples. The chip has been fabricated in a standard 0.18-μm CMOS process with high-precision and high-linearity performance occupying an area of 1.3 × 1.9 mm^2. Sample solutions with various phosphate concentrations have been detected with a step concentration of 0.01 mg/L.
基金
Project supported by the National Key Basic Research and Development Project(No.2015CB352103)
