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H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
H03F3/54—Amplifiers using transit-time effect in tubes or semiconductor devices
H—ELECTRICITY
H03—ELECTRONIC CIRCUITRY
H03B—GENERATION OF OSCILLATIONS, DIRECTLY OR BY FREQUENCY-CHANGING, BY CIRCUITS EMPLOYING ACTIVE ELEMENTS WHICH OPERATE IN A NON-SWITCHING MANNER; GENERATION OF NOISE BY SUCH CIRCUITS
H03B9/00—Generation of oscillations using transit-time effects
H03B9/12—Generation of oscillations using transit-time effects using solid state devices, e.g. Gunn-effect devices
H—ELECTRICITY
H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
H10N—ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR