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JFET Inverter

Discussion in 'Homework Help' started by JeanTech, Feb 13, 2016.

  1. JeanTech

    JeanTech Member

    Joined:
    Feb 20, 2010
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    Hi there

    I'm currently stuck on a simple JFET inverter design. I know the BJT equivalent, but am unsure how to do the equivalent using a JFET. How would I go about designing an inverter using an N-channel JFET? I'm assuming no gate resistor is necessary, since the JFET has a high impedance and only acts on voltage.

    I was thinking of inserting a resistor between Vcc and drain to drop the voltage to 0 V when the JFET is active to achieve the inversion function. How would I calculate this resistor value? At the moment my circuit is acting more like a switch than an inverter.

    Attached, please find my preliminary design.

    Thanks in advance
    Jean
     

    Attached Files:

  2. alec_t

    alec_t Well-Known Member Most Helpful Member

    Joined:
    Jul 10, 2011
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    Location:
    Cardiff, Wales
    Hint:
    To turn an N-channel JFET off you need to make the gate negative with respect to the source.
     

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