Logarithmic current-measuring transistor circuits

Kristian Søe Højberg

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    Abstract

    Describes two transistorized circuits for the logarithmic measurement of small currents suitable for nuclear reactor instrumentation. The logarithmic element is applied in the feedback path of an amplifier, and only one dual transistor is used as logarithmic diode and temperature compensating transistor. A simple one-amplifier circuit is compared with a two-amplifier system. The circuits presented have been developed in connexion with an amplifier using a dual m.o.s. transistor input stage with diode-protected gates.
    Original languageEnglish
    JournalElectronic Engineering
    Volume39
    Issue number467
    Pages (from-to)20-23
    ISSN0366-8819
    Publication statusPublished - 1967

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