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JFET Inverter

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JeanTech

Member
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
 

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alec_t

Well-Known Member
Most Helpful Member
Hint:
To turn an N-channel JFET off you need to make the gate negative with respect to the source.
 
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