| Sumario: | The authors have carried out the large-signal (L-S) simulation of double-drift region (DDR) impact avalanche transit time (IMPATT) diodes based on <111>, <100>, and <110> oriented GaAs. A nonsinusoidal voltage excited (NSVE) L-S simulation technique is used to investigate both the static and L-S performance of the above-mentioned devices designed to operate at millimeter-wave (mm-wave) atmospheric window frequencies, such as 35, 94, 140, and 220GHz. Results show that ?111? oriented GaAs diodes are capable of delivering maximum RF power with highest DC to RF conversion efficiency up to 94GHz; however, the L-S performance of <110> oriented GaAs diodes exceeds their other counterparts while the frequency of operation increases above 94GHz. The results presented in this paper will be helpful for the future experimentalists to choose the GaAs substrate of appropriate orientation to fabricate DDR GaAs IMPATT diodes at mm-wave frequencies.
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