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Describes the first 77 K microwave measurements for resonant-tunnelling hot electron transistors (RHETs) fabricated using GaInAs/AlInAs pseudomorphic heterostructures. A collector current peak-to-valley ratio of 10 is obtained with a peak collector current density of 2*10/sup 5/ A/cm/sup 2/. A current gain cut-off frequency f/sub T/ of 63 GHz and a maximum oscillation frequency f/sub max/ of 44 GHz...
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