JFET Active-mode operation

Discussion in 'Feedback and Suggestions' started by Unregistered, Nov 7, 2009.

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  1. Unregistered

    Thread Starter Guest

    Because JFETs are voltage-controlled current regulators (at least when they're allowed to operate in their active), their inherent amplification factor cannot be expressed as a unitless ratio as with BJTs. In other words, there is no β ratio for a JFET. This is true for all voltage-controlled active devices, including other types of field-effect transistors and even electron tubes. There is, however, an expression of controlled (drain) current to controlling (gate-source) voltage, and it is called transconductance. Its unit is Siemens, the same unit for conductance (formerly known as the mho).

    in their active...) region? conditions? mode?
  2. hgmjr

    Retired Moderator

    Jan 28, 2005
    We ask that you register before you ask questions.

    hgmjr (moderator)
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