|Definition:|| semiconductor sensor integrating an ion-sensitive electrode with a field-effect transistor (FET)
Note 1 to entry: In the ion-sensitive electrode section, the membrane voltage changes according to fluctuations in pH or carbon dioxide partial pressure in the blood, for example. As the voltage amplifier, the ISFET uses a FET, a transistor controlling the conductance of the current path (channels) formed by the majority carriers using an electric field perpendicular to the carrier flow. The ISFET is based on silicon micromachining technology integrating a detector and amplifier on a silicon substrate. In addition, an ISFET with mechanical components such as a valve has been developed. The ISFET is used in such fields as medical analysis and environmental instrumentation.
Note 2 to entry: This note applies to the French language only.