What is a Gunn diode?

A Gunn diode is a type of diode used for microwave oscillators. A diode that uses the Gunn effect. N-type gallium arsenide (GaAs) is mainly used, and physicist J.B. Gunn discovered that when a DC electric field is applied to a GaAs crystal and a certain threshold value is exceeded, oscillation occurs in the microwave region. That is why this phenomenon is called the Gunn effect. Gunn diodes have a negative resistance region, and this effect is used in microwave oscillators. Negative resistance here refers to the electrical property that current decreases as voltage increases.

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