Discussion
Which of the following microwave devices falls under transfer electron device principle ?
Answer: C
The transferred electron device is the Gunn diode.
In gallium arsenide, electrons in a strong field transfer from a low-energy, high-mobility valley of the conduction band to a higher, low-mobility valley. Above a threshold field the average velocity therefore falls as the field rises, a negative differential resistance, and the Gunn diode uses it to generate microwave oscillations.
The klystron, the travelling-wave tube and the magnetron are vacuum tubes. They work by velocity modulation and bunching of an electron beam, or by electrons moving in crossed electric and magnetic fields, not by transferred electrons in a semiconductor.
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