I would like to learn how to choose the L and C values in a DSRD based pulse generator circuit. What modeling software can help me do that and determine the waveforms as functions of the L and Cs? In other words, in Figure 3 of the article "4H-SiC Drift Step Recovery Diode with Super Junction for Hard Recovery" by Xiaoxue Yan , Lin Liang *, Xinyuan Huang, Heqing Zhong and Zewei Yang in Materials 2021, 14, 684 they show the L and C values. SInce I am a novice in pulse generation, can anybody please point to any article that discusses how the circuit would be impacted with different values of C and L? Thank you so much.
Hi Somnath Sengupta ,
sorry, I don't know any articles discussing the effect of a variation of the Cs and Ls. A short discussion of the processes in the circuit can be found in Ref. 26 of the article you mentioned but without explanation of the choice of the actual values.
If I understand correctly, you are not interested in modifications of the DSRD but in the circuit. Therefore, a simulator dealing with SPICE parameters would be sufficient. But seemingly no one has published satisfactory SPICE parameters for DSRDs (possibly, it's due to inherent limitations of SPICE models).
Hence, the usual approach seems to be to model the physical structure of the DSRD by software like Synopsys "Sentaurus" device, and to simulate the circuit in a mixed mode using additionally a SPICE solver. A short description can be found here:
https://ieeexplore.ieee.org/abstract/document/6301739
If you don't have access to similar software, if your budget is limited but your time is not (so much), and since the circuit consists of only 10 elements, I guess a viable solution is to write your own circuit simulator (based on simple laws, very short time steps dt, and the assumption of staircase-shaped voltages and currents), using ideal Rs, Cs, Ls, and diode, replacing the MOSFET by an ideal switch (or, to avoid unrealistic behavior, the erf-shaped variation of a resistance), and modeling the behavior of the DSRD according to the literature. Once your results for the original circuit look like the published ones, you can start varying the elements.
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