Some Generalities of the Transit-time Mode for Two-barrier Devices†

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Abstract
Active devices having injecting and collecting electrodes, such as thermionic tubes, transistors, metal-interface amplifiers, etc., have some common properties. The propagation of an injected current wave gives rise to negative and positive resistances, inductances and capacitances. In all such devices negative resistances are available not only at low frequencies, but at high frequencies as well. The interfaces displaying those characteristics can be formed of metals, insulators and semiconductors.

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