Title :
A digitally programmable calibration circuit for smart sensors
Author :
Guerrero, E. ; Sanz-Pascual, M.T. ; Molina-Reyes, J. ; Medrano, N. ; Calvo, B.
Author_Institution :
Electron. Dept., Nat. Inst. for Astrophys., Opt. & Electron. (INAOE), Tonantzintla, Mexico
Abstract :
A circuit for calibrating the output response of sensors is proposed in this paper. It is based on the Progressive Polynomial Method and is intended to be integrated, whenever possible, with the sensor itself in the same chip. The proposed circuit was designed for a specific sensor, a MIM-ISFET, which was modeled in HSpice. The calibration circuit reduces the error in the output signal due to process variations of both the sensor and the interface circuit from 13% to 2% in the whole sensing range. The circuit was designed in a 0.18 μm standard CMOS process and consumes 2.3 mW.
Keywords :
CMOS integrated circuits; calibration; intelligent sensors; ion sensitive field effect transistors; polynomials; programmable circuits; signal conditioning circuits; CMOS process; HSpice; MIM-ISFET; digitally programmable calibration circuit design; interface circuit; progressive polynomial method; sensors output response; signal error reduction; size 0.18 mum; smart sensors; Calibration; Equations; Integrated circuit modeling; Intelligent sensors; Mathematical model; Simulation; ISFET; sensor calibration; signal conditioning;
Conference_Titel :
Circuits and Systems (LASCAS), 2012 IEEE Third Latin American Symposium on
Conference_Location :
Playa del Carmen
Print_ISBN :
978-1-4673-1207-3
DOI :
10.1109/LASCAS.2012.6180297
