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Depletion mode MOSFETs vs. JFETs

Discussion in 'Electronic Basics' started by Joel Kolstad, Mar 9, 2006.

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  1. Joel Kolstad

    Joel Kolstad Guest

    Assuming you're not intending to forward bias a JFET's gate, is there much of
    a difference between designing a circuit using a depletion mode MOSFET vs. a
    JFET? What are the pros and cons of each? Or -- if they're not so
    dissimilar -- is this one of the reason that depletion mode MOSFETs are
    relatively unusual?

    (I'm assuming N channel devices here since -- per AoE -- P channel JFETs
    aren't generally available.)

    As far as I can tell, the most obvious difference is that there's a reverse
    leakage current coming out of a JFET's gate, whereas MOSFET gate leakage is
    almost nothing.

    ---Joel Kolstad
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