Title :
Novel DC-input ΣΔ capacitance-to-digital convertor for biosensor applications
Author :
Nabovati, Ghazal ; Ghafar-Zadeh, Ebrahim ; Sawan, Mohamad
Author_Institution :
Dept. of Electr. Eng., Polytech. Montreal, Montreal, QC, Canada
Abstract :
In this paper we present a novel DC-input ΣΔ modulator architecture for CMOS capacitive sensors based on charge to digital conversion. This new core-CBCM ΣΔ modulator is designed in Cadence software using TSMC 0.35 μm technology, and based on circuit parameters a behavioral model in Matlab is developed. By using behavioral time-domain simulations in Matlab, optimized values of parameters in ΣΔ modulator are determined to improve the overall circuit performance. The simulation results show that the proposed ΣΔ modulator has the dynamic range of 100-110 fF and can reach to the resolution of 10 bits.
Keywords :
biosensors; capacitance; capacitive sensors; chemical sensors; lab-on-a-chip; microsensors; CMOS capacitive sensors; Cadence software; DC-input ΣΔ capacitance-to-digital convertor; DC-input ΣΔ modulator architecture; TSMC technology; behavioral time-domain simulations; biosensor applications; capacitance 100 fF to 110 fF; circuit parameters; core-CBCM ΣΔ modulator; size 0.35 mum; CMOS integrated circuits; Capacitance; Capacitive sensors; Decoding; MATLAB; Modulation; Sensitivity; ΣΔ charge to digital convertor; CBCM; CMOS; Capacitive sensor; LoC;
Conference_Titel :
New Circuits and Systems Conference (NEWCAS), 2014 IEEE 12th International
Conference_Location :
Trois-Rivieres, QC
DOI :
10.1109/NEWCAS.2014.6933992
