GENG Liang, HUI Ze-ji, ZHANG Xiao-dong, et al. Design of detection circuit of EGFET-based pH sensor with high precision[J]. 2018, 37(11): 96-98+102. DOI: 10.13873/j.1000-9787(2018)11-0096-03.
A detection circuit of extended-gate field-effect-transistors(EGFET)-based pH senors is designed
including signal acquisition
signal conversion and processing
amplifier circuit design
ADC converter
and software design.The experimental result shows that the sensitivity of output voltage of circuit is 39.68 m V/pH ranging from pH = 4 to pH = 10. Compared with conventional pH glass electrodes
EGFET-based pH sensors have the characteristics of fast response
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