A device for measuring the concentration of a chemical species ionic and application of this device has the measurement of the ph of a solution

摘要

The invention relates to a device for measuring the concentration of a chemical species. / p & & p & the device comprises a cmos inverter 22, the form of a mos transistor ion-sensitive has a p channel 24 provided with a first layer ion-sensitive and of a mos transistor ion-sensitive has an n channel 26 provided with a second layer ion-sensitive, these two transistors being connected electrically in series, a reference electrode 28 connected electrically to the output s of the inverter, and a second cmos inverter 38, the form of a mos transistor has a p channel 40 and of a mos transistor is an n channel 42 connected in series, serving as reference in order to carry out a differential measurement between the first and second inverters. / p & & p & application is the determination of the ph of a solution.