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Large-signal characterization of millimeter-wave IMPATTs: effect of reduced impact ionization rate of charge carriers due to carrier-carrier interactions

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In this paper, we study the effect of energy loss of charge carriers due to carrier-carrier interactions prior to impact ionization on the static and large-signal characteristics of double-drift region impact avalanche transit time (IMPATT) diodes based on Si designed to operate at millimeter-wave (mm-wave) atmospheric window frequencies such as 94, 140, and 220 GHz. The above mentioned effect has been incorporated in the simulation by taking into account a recently reported generalized analytical model of impact ionization rate of charge carriers based on multistage scattering phenomena in the base semiconductor. Results are compared with static and large-signal signal simulation results of the same diodes that we have reported earlier by taking into account the empirical relation of ionization rates fitted from the experimental data (experiment was carried out on IMPATT structures suitable for operating near 100 GHz). It is observed that both the large-signal RF power output and DC to RF conversion efficiency of the diodes are deteriorated significantly due to reduced ionization rates as a consequence of carrier-carrier collision events prior to the impact ionization. This effect is found to be more pronounced in 140 and 220 GHz diodes due to the enhanced carrier-carrier collisions within those diodes having greater background doping densities as compared to 94 GHz diode. The simulation results presented in this paper found to be in closer agreement with the experimental results as compared to the results that we have reported earlier.

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Acknowledgments

The Authors wish to thank Supreme Knowledge Foundation Group of Institutions for providing excellent research facilities. Moreover, Aritra Acharyya is grateful to Professor (Dr.) J. P. Bandyopadhyay, Emeritus Fellow (UGC), Institute of Radio Physics and Electronics, University of Calcutta, for providing valuable suggestions to carry out the present work.

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Bandyopadhyay, P.K., Chakraborty, S., Biswas, A. et al. Large-signal characterization of millimeter-wave IMPATTs: effect of reduced impact ionization rate of charge carriers due to carrier-carrier interactions. J Comput Electron 15, 646–656 (2016). https://doi.org/10.1007/s10825-016-0799-0

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  • DOI: https://doi.org/10.1007/s10825-016-0799-0

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