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What’s All This JFET Constant-Current Stuff, Anyhow? (.PDF Download)

When you connect the gate to the source of a JFET (junction field-effect transistor), it becomes a two-terminal current source. The current that will flow is called IDSS (current, drain-to-source, saturated). One problem you might face is that the IDSS of FETs is quite variable for different parts of the same number. The size of the JFET will determine the rough range of the current, but it does change over temperature. JFETs are depletion-mode devices that conduct until you apply a negative

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TAGS: Analog
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