High-voltage nanosecond/subnanosecond pulse generators based on avalanche transistors.

Area of Science:

• Electrical Engineering
• Pulsed Power Technology
• Semiconductor Devices

Background:

• Pulsed-power technology is evolving towards dual-use applications, demanding higher voltages, faster rise times, and compact designs.
• Avalanche transistors (ATs) are emerging as key switching devices due to their size, high pulse-repetition frequency (PRF), and fast switching capabilities.

Purpose of the Study:

• To review and synthesize methods for generating high-voltage nanosecond/subnanosecond pulses using avalanche transistors.
• To analyze triggering challenges, failure mechanisms, and mitigation strategies in AT-based circuits.

Main Methods:

• Categorization of AT pulse generation schemes into basic, composite, and pulse-stacking circuits.
• Analysis of triggering issues and failure modes, particularly in Marx bank circuits.
• Summary of mitigation techniques, including auxiliary triggering and acceleration circuits.

Main Results:

• Comparison of trade-offs between different AT generation circuit topologies.
• Identification of pre-stage conduction failure and current filamentation as key failure mechanisms.
• Outline of representative applications, including plasma actuation, biomedical uses, and high-speed imaging.

Conclusions:

• Avalanche transistors offer significant advantages for next-generation pulsed-power systems.
• Understanding and mitigating failure mechanisms are critical for reliable AT circuit operation.
• Further development of AT pulse circuitry holds promise for diverse technological advancements.