Title :
Programmable calibration circuit for a MIM-ISFET device
Author :
Guerrero, E. ; Sanz-Pascual, M.T. ; Molina-Reyes, J. ; Medrano, N. ; Calvo, B. ; Antolín, D.
Author_Institution :
Electron. Dept., INAOE, Puebla, Mexico
Abstract :
A programmable calibration circuit for sensors is proposed in this paper, which carries out an offset compensation by adding an appropriate correction factor to the transfer function of each sensor. The circuit was designed for a specific sensor structure, a MIM-ISFET, which was modeled in HSpice. The proposed scheme reduces the offset error due to process variations of both the sensor and the interface circuit from 13% to 2% at the minumim pH level and from 13% to 4% in the whole sensing range. The circuit was designed in a 0.18μm standard CMOS process, occupies an area of 115 × 62 μm2 and consumes 1.6mW.
Keywords :
CMOS integrated circuits; MIM devices; SPICE; calibration; programmable circuits; HSpice; MIM-ISFET device; interface circuit; minumim pH level; offset compensation; offset error; programmable calibration circuit; standard CMOS process; Calibration; Electric potential; Integrated circuit modeling; Intelligent sensors; Logic gates; Semiconductor device modeling; ISFET; sensor calibration; signal conditioning;
Conference_Titel :
Instrumentation and Measurement Technology Conference (I2MTC), 2012 IEEE International
Conference_Location :
Graz
Print_ISBN :
978-1-4577-1773-4
DOI :
10.1109/I2MTC.2012.6229398
