From conventional membrane electrodes to ion-sensitive field-effect transistors

Piet Bergveld, N.F. de Rooij

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    The theory concerning conventional membrane electrodes is often used as a starting point for the theoretical description of the operation of an ion-sensitive field-effect transistor. Although this results in a useful description of the device, a better view of the principles, and consequently the possibilities, of the new ion-sensitive device may result if the analysis is carried out in more detail, especially with respect to measuring concepts. This is presented in the paper. A careful comparison between the operation of a conventional membrane electrode and the i.s.f.e.t. leads to a definite classification of different types of i.s.f.e.t.s. These types are illustrated with corresponding measurements. In addition, the most appropriate application for each type is mentioned.
    Original languageUndefined
    Pages (from-to)647-654
    JournalMedical & biological engineering & computing
    Issue number5
    Publication statusPublished - 1979


    • IR-85464

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