Design and experiment of a sub-nanosecond repetition rate pulse signal generator
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摘要: 亚纳秒前沿、数百伏幅度、近似高斯单周波的重频窄脉冲信号源在超宽带探测、电磁兼容测试等领域有着十分广泛的应用。设计了一种全固态Marx电路结构型重频脉冲信号源，选用云母电容、雪崩三极管、贴片电阻、电感等元器件，根据信号输出要求优化印制电路板（PCB）布局及微带线结构，调整匹配电路元件参数，在50 Ω电阻负载上获得了脉冲峰值约1 kV、脉宽约650 ps、前沿约450 ps、后沿约700 ps的单极性负脉冲信号，脉冲波形前后沿相似且光滑陡峭，实现了10 kHz重频输出，波形峰值抖动和半高宽抖动均小于10%。Abstract: The repetitive narrow pulse signal generator with a sub-nanosecond front, high-voltage amplitude, and approximately Gaussian single-cycle waveform is extensively applied in areas such as ultra-wideband detection and electromagnetic compatibility testing. This paper introduces the design of an all-solid-state repetitive pulse generator utilizing a Marx circuit architecture, which incorporates components like mica capacitors, avalanche transistors, surface-mount technology resistors, and inductors. To meet the signal output specifications, the printed circuit board layout and microstrip lines have been optimized. Through fine-tuning the matching circuit element parameters, the generator successfully delivers a unipolar negative pulse signal with a peak value of approximately 1 kV, a pulse width of around 650 ps, a leading edge of approximately 450 ps, and a trailing edge of about 700 ps across a 50 Ω resistive load. The resulting pulse waveform exhibits similar, smooth, and steep leading and trailing edges, achieving a repetition rate of 10 kHz. Both the peak value and full width at half maximum jitters are maintained at less than 10%.
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Key words:
- Gaussian pulse /
- avalanche transistor /
- marx circuit /
- pulse source /
- high repetition rate
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