Physical Modeling of Output Pulse Process in Pulse Generator Based on Drift Step Recovery Diodes

Drift Step Recovery Diodes (DSRDs) are essential components in pulse generators, applicable to a broad spectrum of high-power and high-frequency applications. However, existing models predominantly emphasize device structural parameters while neglecting the critical influence of circuit parameters such as output current and pulse width. This study introduces a physical model for pulse generators that integrates drive circuit parameters and device structural parameters through rapid current interruption, thereby enhancing the accuracy of output pulse predictions and improving design efficiency. The proposed model calculates the current interruption phase by analyzing the turn-off oscillations of the MOSFET within the drive circuit and incorporates timedependent current dynamics to generate a temporal variation of the output voltage. Validation through extensive simulations and experimental measurements confirms the accuracy of the model in predicting key output pulse characteristics, including output voltage rise rate, and peak voltage, with relative deviations of less than 10% compared to simulation results and experimental results. Meanwhile, the model is capable of predicting the trend of the pre-pulse variation. Furthermore, the applicability of the proposed model has been thoroughly discussed, thereby providing a reliable tool for the optimization of DSRDs-based pulse generators. This work significantly contributes to the design of DSRDs-based pulse generators.