Harmonic mode analysis of low-hi-low and high low Silicon DDDs

Low-high-low and High-low doping profile IMPATT DDDs have been designed and optimized, analyzed for 15 GHz, 35 GHz, 60 and 94 GHz operations following computer simulation experiment for DC, high frequency and avalanche noise analysis. The results showed that efficiency as high as 28.7% is achievable for the 15 GHz DDD for low-hi-low doped junction and 26.8% for high-low junction, which is the optimum as per update report. The efficiency falls with frequency but remains sufficiently above flat counterpart. Each of the diodes has been analyzed for wide band operation in harmonic mode i.e. within the frequency range of 10–400 GHz. It is interesting to note that each of the diode exhibits multiple band frequency operation within the frequency range of analysis. The 15 GHz diode showed the existence of 15 frequency bands exhibiting RF negative resistance.