Experiments on a new type of two-port, unilateral traveling-wave amplifier using subcritically doped GaAs specimens several space-charge wavelengths long are described. Net terminal gains of 2-4 dB are reported in the frequency range 700-1500 MHz. The gain is presently limited by inefficient coupling to the space-charge wave; the measured variation of phase delay between input and output terminals as a function of bias voltage is in good accord with theory, however.
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Robson et al. (1967) studied this question.
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