MHz Nanosecond Rectangular Pulse Generator With High Voltage Gain and Multimode

Abstract

The nanosecond short pulse generator, which operates continuously at MHz repetition rates, plays an important role in high-energy accelerators, pulsed laser modulation, electromagnetic biological effects, and other fields. Pulse-forming lines based on gas spark gap are the main means to generate high-voltage nanosecond short pulses; but due to electrode ablation, it is difficult to operate at MHz repetition rates. The topologies based on the fully controlled semiconductor device can output multimode nanosecond pulse. But it is limited by the gate driver ability and system stray loss, so it is difficult to directly generate flexible and adjustable nanosecond short pulse with MHz repetition rates. In order to overcome the above shortcomings, this article proposes the Blumlein-based <italic xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">LC</i> underdamped oscillation boost circuit and the Blumlein stack topology to achieve high voltage gain. And, the voltage wave process can be adjusted by controlling the switching sequence to change operating mode. Finally, multimode operation such as positive polarity, negative polarity, bipolar and pulse duration modulation can be realized with MHz repetition rates and high gain voltage.