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Harmonic multiplication to a frequency of 320 GHz in resonant tunnelling diodes with 1.7 nm thick AlAs barriers is reported. These results are attributed to an unusually high current density of 2.8 × 105 A/cm2. The fifth harmonic output power using resonant tunnelling diodes becomes comparable with that of Schottky barrier diodes.
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Bouregba et al. (1990) studied this question.
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