The Different Ways To Look At Negative Resistance

An exploration of negative resistance covers the common notion of negative differential resistance (NDR), seen in devices like neon lamps where increasing current can decrease voltage. It also explains why a true passive negative resistor (like a literal -100 Ω resistor) cannot exist without an external power source, and describes an op-amp based design that achieves ideal constant negative resistance within a limited operating range. The concept also appears in unusual devices such as tunnel diodes.

Source: https://hackaday.com/2026/09/08/the-different-ways-to-look-at-negative-resistance. 8 Sync News only summarizes and links out; content copyright belongs to the authors and original sources.