I think I have the circuit you need. It is circa-1965 and uses 3-4 bipolar transistors, a zener diode, and a handful of resistors. All components are "garden variety" with nothing special. It works to a few MHz. It IS a 2-terminal device and can be used much like a tunnel diode. Voltages are a lot higher than a tunnel diode: peak voltage is around 2V, valley voltage is around 5V and peak current is a few 10s of mA; all of these values are settable as part of the circuit design. ?I have it ONLY as a PDF but it is simple enough to create in LTspice. I will put it, appropriately named, in the group image/picture directory and post a message with a link. This should be done within a few hours of this message time.
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Jim Wagner
Oregon Research Electronics
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On 03/28/2025 11:44 AM PDT sebastian.herrera via groups.io <sebastian.herrera@...> wrote:
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Dear all, I am trying to simulate a circuit with negative conductance using transistors and passive components. Does anyone have a circuit for this?
Best regards.
Sebastian?
