Research On All-solid-state, High-repetition-rate,Ultra-fast Electrical Pulse Source

Ultra-fast electrical pulse technology based on ultra-fast electronic devices andmicrowave technology, as a tool for generating, analyzing and measuring high-orlow-voltage ultra-fast electrical pulse, is mainly applied in inertial confinement fusion(ICF), high-speed photography, laser technology and electromagnetic interference.Ultra-wideband electrical pulse source based on ultra-fast electrical pulse technology,featuring all-solid-state and small-sized structure, is easier to be integrated into thesystem and compatible with other devices but harder to obtain pulses of high powerand high-repetition-rate frequency. This is because the high output power due toincrease in frequency renders electronic devices more vulnerable.In this paper, we present a method of frequency synthesis to realizehigh-repetition-rate frequency of high-voltage pulse. Some key technologies such asMulti-channel high voltage picosecond pulse output, time delay control, pulsecoupling and the stability of pulse are investigated. First improved MARX circuits areemployed to generate multi-channel high-voltage picosecond pulses as singlesources of frequency synthesis, then a MCU-FPGA-designed time delay device isfollowed to generate synchronous trigger pulses and delay each trigger pulseaccording to the setting values to yield delay in output pulses of single sources, andthe isolation circuit and impedance matching circuit are finally presented to realize thecoupling of multi-channel output pulses, achieving frequency synthesis as expected.The entire system is taken measures of high-frequency circuit boards, microstriptransmission lines, front and rear-class isolation and impedance compensation toensure the stability of the pulse. The idea has been confirmed by experimentallysynthesizing frequencies of two pulses with the result of output pulse frequencyincreased. The two output pulses from the improved MARX circuits are2.56KV inamplitude,7.13ns in width and30KHz in repetition frequency and can be achieveddelay control effectively.While the coupled pulse is2.46KV and7.49ns in amplitudeand width, respectively. This method can be extended to more than three pulses toobtain higher frequency.