Record performances in terms of output power (9.5 dBm) and maximum efficiency (12.3%) have been demonstrated for a 250 GHz heterostructure barrier varactor tripler. Such good results are explained by the use of highly nonlinear InGaAs/InAlAs/AlAs planar integrated diodes, which are seen to have numerous advantages over their GaAs-based counterparts.
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Mélique et al. (1999) studied this question.
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