Multi-finger floating-base silicon controlled rectifiers (SCRs) of discrete technologies are investigated by transmission line pulses (TLP) with short (300ps) and long (10ns) pulse rise times (RT). Transient interferometric mapping (TIM) is applied to study the finger triggering dynamics. The measurements are correlated with TCAD simulation. It is found that for short RT the fingers trigger simultaneously which is due to the positive influence of a voltage overshoot related to delayed conductivity modulation. For long RT the fingers trigger sequentially which is accompanied by the voltage drops near the holding voltage. The time delay between the triggering of neighboring fingers is in the 3–150ns range and depends on the actual current density in fingers. The sequential finger triggering is due to lateral carrier diffusion-limited processes and the coupling via substrate currents.

中文翻译：

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多指浮动基极 SCR 中的同步和顺序触发取决于 TLP 脉冲上升时间

通过具有短 (300ps) 和长 (10ns) 脉冲上升时间 (RT) 的传输线脉冲 (TLP) 研究分立技术的多指浮基可控硅整流器 (SCR)。瞬态干涉映射 (TIM) 用于研究手指触发动力学。测量值与 TCAD 模拟相关。发现对于短RT，指同时触发，这是由于与延迟电导调制相关的电压过冲的积极影响。对于长 RT，手指顺序触发，伴随着接近保持电压的电压下降。相邻手指触发之间的时间延迟在 3-150ns 范围内，取决于手指中的实际电流密度。