Abstract
Measurements of large-signal impedance, ac voltage and dc voltage V0versus dc current I0on Si p-n-n+IMPATT diodes in pulse operation (80 ns) suggest that the efficiency of Si IMPATT diodes is limited by instability effects causing a splitup into regions with different current densities. The effect is explained by considering the I0-V0curves at constant ac voltage. These can be S-shaped owing to impact ionization in the drift region.

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